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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/11/15 21:18:59 UTC

[GitHub] [incubator-nuttx] btashton opened a new pull request #2308: Add release notes for NuttX-10.0.0

btashton opened a new pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308


   ## Summary
   This contains the release notes for the 10.0.0 release.


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[GitHub] [incubator-nuttx] xiaoxiang781216 merged pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

xiaoxiang781216 merged pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308


   


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[GitHub] [incubator-nuttx] Ouss4 commented on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

Ouss4 commented on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-727641974


   > It would be better if we just did it in markdown in the first place. I think the issues there might be I dont know how well Confluence lets multiple people edit at markdown the same time. There might be a better solution for that. Something we can think about going forward.
   
   Are you aware of any limitations in Confluence about that?  For a reference, podling reports are all in Markdown.  When submitted, it's just one file that's being edited by multiple people at the same time.
   Anyway, we'll talk about this (and hopefully the ReleaseNote file too) after we get 10.0 out.


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[GitHub] [incubator-nuttx] Ouss4 commented on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

Ouss4 commented on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-727639349


   Did you manually convert it to markdown?
   
   We need to do the same to the [template](https://cwiki.apache.org/confluence/display/NUTTX/Release+Notes+Template+-+NuttX+X.Y) and then be able to just copy paste from Confluence.


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[GitHub] [incubator-nuttx] btashton commented on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

btashton commented on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-727638642


   This is currently fully in sync with the draft in the wiki which is also up-to-date as of now.  There is one outstanding ticket that I know of that needs to be addressed before we merge this in and cut an RC.


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[GitHub] [incubator-nuttx] acassis commented on a change in pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

acassis commented on a change in pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#discussion_r524538457



##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every

Review comment:
       Chang = Change

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly

Review comment:
       initialization

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode
+
+ * [PR-1246](https://github.com/apache/incubator-nuttx/pull/1246) STM32L4: Fix
+ issue where clock divider for serial baud rate was not set correctly
+
+#### Miscellaneous
+
+ * [PR-1912](https://github.com/apache/incubator-nuttx/pull/1912) Fix
+ up\_interrupt\_contex() in case of SMP - Make sure the operation is atomic in
+ case of SMP
+
+## Driver Support
+
+### Bug Fixes
+
+ * [PR-1896](https://github.com/apache/incubator-nuttx/pull/1896) spi\_xx25xx
+ EEPROM: return the number of bytes written instead of 0 or error
+
+ * [PR-1891](https://github.com/apache/incubator-nuttx/pull/1891) serial: Don't
+ mangle PID when ISIG is changed
+
+ * [PR-1856](https://github.com/apache/incubator-nuttx/pull/1856) pipe: In case
+ of empty pipe with no writers, return EOF instead of EAGAIN
+
+ * [PR-1836](https://github.com/apache/incubator-nuttx/pull/1836) stmpe811: Fix
+ incorrect GPIO interrupt register logic
+
+ * [PR-1741](https://github.com/apache/incubator-nuttx/pull/1741) mmcsd\_sdio:
+ Properly arm the write completion detection
+
+ * [PR-1370](https://github.com/apache/incubator-nuttx/pull/1370) can: Fix
+ incorret usage of nxsem\_getvalue which caused fifo->rx\_sem to increase with
+ teach received msg
+
+ * [PR-1452](https://github.com/apache/incubator-nuttx/pull/1452) lcd: Fix
+ memory leak when board\_graphics\_setup fail
+
+
+
+### New Driver Support
+
+ * [PR-1797](https://github.com/apache/incubator-nuttx/pull/1797) leds: WS2812
+ LED controller (aka Adafruit NeoPixel)
+
+ * [PR-1851](https://github.com/apache/incubator-nuttx/pull/1851) kbd: Add
+ support for SolderParty BlackBerry Q10 Keyboard
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) BQ27426 fuel
+ gauge
+
+ * [PR-1276](https://github.com/apache/incubator-nuttx/pull/1276) Add support
+ for the ST7735 TFT Controller
+
+ * [PR-1233](https://github.com/apache/incubator-nuttx/pull/1233) usbhost: Add
+ support for CDC-MBIM USB host driver
+
+### Drivers With Significant Improvements
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) stmpe811: Add
+ SPI support for touch screen controller
+
+ * [PR-1800](https://github.com/apache/incubator-nuttx/pull/1800) vfs: Add
+ `FIOCLEX/FIONCLEX` ioctl support
+
+ * [PR-1798](https://github.com/apache/incubator-nuttx/pull/1798) mmcsd: Allow
+ setting `IDMODE_CLOCK` via kconfig
+
+ * [PR-1587](https://github.com/apache/incubator-nuttx/pull/1587) BCH: Delay the
+ sector flush to avoid multiple earse/write operations in sequence write
+
+ * [PR-1577](https://github.com/apache/incubator-nuttx/pull/1577) rwbuffer:
+ Avoid allocating memory for the temporary erase buffer by the FTL driver
+
+ * [PR-1466](https://github.com/apache/incubator-nuttx/pull/1466) Altair Modem:
+ Add board specific logic, Fix issue that SPI4 RX frequency violated AC Spec,
+ Fix priority of SPI transfer task is too low, Modify timeout value for RX ready
+
+ * [PR-1471](https://github.com/apache/incubator-nuttx/pull/1471) ramlog: Add
+ option to overwrite buffer
+
+ * [PR-1547](https://github.com/apache/incubator-nuttx/pull/1547) usbhub: Make
+ sure to enumerate hubs that report protocol = 1 (High Speed Hub)
+
+ * [PR-1374](https://github.com/apache/incubator-nuttx/pull/1374) gpio: Extend
+ gpio\_pintype\_e for pulldown/up and opendrain
+
+ * [PR-1249](https://github.com/apache/incubator-nuttx/pull/1249) bmp280: Add
+ support for reading temperature
+
+ * [PR-1299](https://github.com/apache/incubator-nuttx/pull/1299) mpu60x0: Add
+ I2C support for the MPU60x0 sensor driver
+
+ * [PR-1325](https://github.com/apache/incubator-nuttx/pull/1325) can: expose
+ NART/ABOM and RTR settings via ioctls
+
+ * [PR-1520](https://github.com/apache/incubator-nuttx/pull/1520) note: Move
+ note driver from syslog to drivers/note
+
+ * [PR-1288](https://github.com/apache/incubator-nuttx/pull/1288) / PR-1449
+ note: Add sched\_note\_syscall\_enter/leave hooks for syscall instrumentation
+
+ * [PR-1259](https://github.com/apache/incubator-nuttx/pull/1259) note: Add
+ buffering support for syscall instrumentation
+
+ * [PR-1256](https://github.com/apache/incubator-nuttx/pull/1256) note: Add
+ hooks for note driver for interrupt instrumentation
+
+Board Support -------------
+
+### **Significant Improvements**
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) metro-m4: Add
+ support for: SmartFS initialization, AT24 EEPROM, GPIO dev, BQ27426 gague
+ initialization
+
+ * [PR-1727](https://github.com/apache/incubator-nuttx/pull/1729) b-g474e-dpow1:
+ Add support for FLASH bootloader
+
+ * [PR-1683](https://github.com/apache/incubator-nuttx/pull/1683) cxd56xx: Add
+ wifi\_smp configuration
+
+ * [PR-1668](https://github.com/apache/incubator-nuttx/pull/1668) sim: Add new
+ configuration for SMP
+
+ * [PR-1644](https://github.com/apache/incubator-nuttx/pull/1644)
+ stm32f746g-disco: Move serial console from USART6 to USART1 which is attached
+ to the USB virtual COM port.
+
+ * [PR-1464](https://github.com/apache/incubator-nuttx/pull/1464) cxd56xx: Add
+ new GNSS functions, support for lower PWM frequency,
+ CONFIG\_CPUFREQ\_RELEASE\_LOCK, high speed ADC, HPADC input gain configuration,
+ eMMC device, frame buffer support
+
+ * [PR-1405](https://github.com/apache/incubator-nuttx/pull/1405)
+ stm32f4discovery: Add ELF support to wifi configuration
+
+ * [PR-1402](https://github.com/apache/incubator-nuttx/pull/1402) imxrt1060: Add
+ buttons support to iMXRT1060
+
+ * [PR-1590](https://github.com/apache/incubator-nuttx/pull/1590) sim: Add
+ duktape configuration
+
+ * [PR-1532](https://github.com/apache/incubator-nuttx/pull/1532) sim: Add
+ cromfs configuration
+
+ * [PR-1335](https://github.com/apache/incubator-nuttx/pull/1335) cxd56xx:
+ Enable basic snapshop camera example
+
+### New Board Support
+
+ * [PR-1664](https://github.com/apache/incubator-nuttx/pull/1664) NRF52: Add
+ support for NRF52832 MakerDiary MDK board
+
+ * [PR-1633](https://github.com/apache/incubator-nuttx/pull/1633) NRF52: Add
+ support for Sparkfun NRF52832 Breakout Board
+
+ * [PR-1728](https://github.com/apache/incubator-nuttx/pull/1728) SAMA5D27: Add
+ support for Giant Board
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1397) EOSS3: Initial
+ support for the QuickLogic EOS S3 SoC QuickFeather board
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for nucleo-f412zg board
+
+File System -----------
+
+### **Bug Fixes**
+
+ * [PR-1796](https://github.com/apache/incubator-nuttx/pull/1796) vfs: Fix
+ memory leak calling `pseudorename`
+
+ * [PR-1794](https://github.com/apache/incubator-nuttx/pull/1794) vfs: Fix issue
+ where opendir would remove the trailing whitespace or /
+
+ * [PR-1793](https://github.com/apache/incubator-nuttx/pull/1793) vfs: Make sure
+ that rename of mount point uses pseudorename. Previously mv on a mountpoint
+ would return err 88.
+
+ * [PR-1737](https://github.com/apache/incubator-nuttx/pull/1737) vfs: reuse
+ file\_dup2 direction in file\_dup to prevent segfault issue
+
+ * [PR-1490](https://github.com/apache/incubator-nuttx/pull/1490) Insure that
+ filesystems can all support paths that end with '/'
+
+ * [PR-1546](https://github.com/apache/incubator-nuttx/pull/1546) ROMFS: Fix
+ issue with how hard links are followed for ROMFS
+
+ * [PR-1442](https://github.com/apache/incubator-nuttx/pull/1442) SmartFS: Fix
+ file size corruption when opening with overwriting mode
+
+ * [PR-1431](https://github.com/apache/incubator-nuttx/pull/1431) nxffs: Fix
+ scan good block slowly and scan an invalid block
+
+PR-1295 fs: for setfd correct the return value
+
+### **Significant Improvements**
+
+ * [PR-1554](https://github.com/apache/incubator-nuttx/pull/1554) CROMFS: Add
+ support for hard links
+
+ * [PR-1499](https://github.com/apache/incubator-nuttx/pull/1499) FAT: Add
+ support for UTF8 long filename
+
+ * [PR-1479](https://github.com/apache/incubator-nuttx/pull/1479) vfs: Add file
+ descriptor based events support eventfd()
+
+ * [PR-1582](https://github.com/apache/incubator-nuttx/pull/1482) vfs: Add
+ epoll\_create1() support
+
+ * [PR-1579](https://github.com/apache/incubator-nuttx/pull/1579) vfs: Do not
+ check CONFIG\_NFILE\_STREAMS for mkdir/rename/rmdir/fs\_unlink
+
+ * [PR-1355](https://github.com/apache/incubator-nuttx/pull/1355) vfs: Implement
+ statvfs and fstatvfs
+
+ * [PR-1323](https://github.com/apache/incubator-nuttx/pull/1323) vfs: Add
+ chmod/fchmod/utimes function prototypes
+
+Networking ----------
+
+### **Bug Fixes**
+
+ * [PR-1267](https://github.com/apache/incubator-nuttx/pull/1267) SocketCAN:
+ When timestamped frame was recived while in CAN2.0B mode the frame got dropped.

Review comment:
       received

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic

Review comment:
       host
   
   BTW, this patch is for simulator, not for ESP32, it is at wrong section

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.

Review comment:
       configuration

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to

Review comment:
       compensation

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has

Review comment:
       driver

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state

Review comment:
       earlier

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating

Review comment:
       is enabled

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang

Review comment:
       selection

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode

Review comment:
       required

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode
+
+ * [PR-1246](https://github.com/apache/incubator-nuttx/pull/1246) STM32L4: Fix
+ issue where clock divider for serial baud rate was not set correctly
+
+#### Miscellaneous
+
+ * [PR-1912](https://github.com/apache/incubator-nuttx/pull/1912) Fix
+ up\_interrupt\_contex() in case of SMP - Make sure the operation is atomic in
+ case of SMP
+
+## Driver Support
+
+### Bug Fixes
+
+ * [PR-1896](https://github.com/apache/incubator-nuttx/pull/1896) spi\_xx25xx
+ EEPROM: return the number of bytes written instead of 0 or error
+
+ * [PR-1891](https://github.com/apache/incubator-nuttx/pull/1891) serial: Don't
+ mangle PID when ISIG is changed
+
+ * [PR-1856](https://github.com/apache/incubator-nuttx/pull/1856) pipe: In case
+ of empty pipe with no writers, return EOF instead of EAGAIN
+
+ * [PR-1836](https://github.com/apache/incubator-nuttx/pull/1836) stmpe811: Fix
+ incorrect GPIO interrupt register logic
+
+ * [PR-1741](https://github.com/apache/incubator-nuttx/pull/1741) mmcsd\_sdio:
+ Properly arm the write completion detection
+
+ * [PR-1370](https://github.com/apache/incubator-nuttx/pull/1370) can: Fix
+ incorret usage of nxsem\_getvalue which caused fifo->rx\_sem to increase with
+ teach received msg
+
+ * [PR-1452](https://github.com/apache/incubator-nuttx/pull/1452) lcd: Fix
+ memory leak when board\_graphics\_setup fail
+
+
+
+### New Driver Support
+
+ * [PR-1797](https://github.com/apache/incubator-nuttx/pull/1797) leds: WS2812
+ LED controller (aka Adafruit NeoPixel)
+
+ * [PR-1851](https://github.com/apache/incubator-nuttx/pull/1851) kbd: Add
+ support for SolderParty BlackBerry Q10 Keyboard
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) BQ27426 fuel
+ gauge
+
+ * [PR-1276](https://github.com/apache/incubator-nuttx/pull/1276) Add support
+ for the ST7735 TFT Controller
+
+ * [PR-1233](https://github.com/apache/incubator-nuttx/pull/1233) usbhost: Add
+ support for CDC-MBIM USB host driver
+
+### Drivers With Significant Improvements
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) stmpe811: Add
+ SPI support for touch screen controller
+
+ * [PR-1800](https://github.com/apache/incubator-nuttx/pull/1800) vfs: Add
+ `FIOCLEX/FIONCLEX` ioctl support
+
+ * [PR-1798](https://github.com/apache/incubator-nuttx/pull/1798) mmcsd: Allow
+ setting `IDMODE_CLOCK` via kconfig
+
+ * [PR-1587](https://github.com/apache/incubator-nuttx/pull/1587) BCH: Delay the
+ sector flush to avoid multiple earse/write operations in sequence write

Review comment:
       erase/write

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode
+
+ * [PR-1246](https://github.com/apache/incubator-nuttx/pull/1246) STM32L4: Fix
+ issue where clock divider for serial baud rate was not set correctly
+
+#### Miscellaneous
+
+ * [PR-1912](https://github.com/apache/incubator-nuttx/pull/1912) Fix
+ up\_interrupt\_contex() in case of SMP - Make sure the operation is atomic in
+ case of SMP
+
+## Driver Support
+
+### Bug Fixes
+
+ * [PR-1896](https://github.com/apache/incubator-nuttx/pull/1896) spi\_xx25xx
+ EEPROM: return the number of bytes written instead of 0 or error
+
+ * [PR-1891](https://github.com/apache/incubator-nuttx/pull/1891) serial: Don't
+ mangle PID when ISIG is changed
+
+ * [PR-1856](https://github.com/apache/incubator-nuttx/pull/1856) pipe: In case
+ of empty pipe with no writers, return EOF instead of EAGAIN
+
+ * [PR-1836](https://github.com/apache/incubator-nuttx/pull/1836) stmpe811: Fix
+ incorrect GPIO interrupt register logic
+
+ * [PR-1741](https://github.com/apache/incubator-nuttx/pull/1741) mmcsd\_sdio:
+ Properly arm the write completion detection
+
+ * [PR-1370](https://github.com/apache/incubator-nuttx/pull/1370) can: Fix
+ incorret usage of nxsem\_getvalue which caused fifo->rx\_sem to increase with

Review comment:
       incorrect

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode
+
+ * [PR-1246](https://github.com/apache/incubator-nuttx/pull/1246) STM32L4: Fix
+ issue where clock divider for serial baud rate was not set correctly
+
+#### Miscellaneous
+
+ * [PR-1912](https://github.com/apache/incubator-nuttx/pull/1912) Fix
+ up\_interrupt\_contex() in case of SMP - Make sure the operation is atomic in
+ case of SMP
+
+## Driver Support
+
+### Bug Fixes
+
+ * [PR-1896](https://github.com/apache/incubator-nuttx/pull/1896) spi\_xx25xx
+ EEPROM: return the number of bytes written instead of 0 or error
+
+ * [PR-1891](https://github.com/apache/incubator-nuttx/pull/1891) serial: Don't
+ mangle PID when ISIG is changed
+
+ * [PR-1856](https://github.com/apache/incubator-nuttx/pull/1856) pipe: In case
+ of empty pipe with no writers, return EOF instead of EAGAIN
+
+ * [PR-1836](https://github.com/apache/incubator-nuttx/pull/1836) stmpe811: Fix
+ incorrect GPIO interrupt register logic
+
+ * [PR-1741](https://github.com/apache/incubator-nuttx/pull/1741) mmcsd\_sdio:
+ Properly arm the write completion detection
+
+ * [PR-1370](https://github.com/apache/incubator-nuttx/pull/1370) can: Fix
+ incorret usage of nxsem\_getvalue which caused fifo->rx\_sem to increase with
+ teach received msg
+
+ * [PR-1452](https://github.com/apache/incubator-nuttx/pull/1452) lcd: Fix
+ memory leak when board\_graphics\_setup fail
+
+
+
+### New Driver Support
+
+ * [PR-1797](https://github.com/apache/incubator-nuttx/pull/1797) leds: WS2812
+ LED controller (aka Adafruit NeoPixel)
+
+ * [PR-1851](https://github.com/apache/incubator-nuttx/pull/1851) kbd: Add
+ support for SolderParty BlackBerry Q10 Keyboard
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) BQ27426 fuel
+ gauge
+
+ * [PR-1276](https://github.com/apache/incubator-nuttx/pull/1276) Add support
+ for the ST7735 TFT Controller
+
+ * [PR-1233](https://github.com/apache/incubator-nuttx/pull/1233) usbhost: Add
+ support for CDC-MBIM USB host driver
+
+### Drivers With Significant Improvements
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) stmpe811: Add
+ SPI support for touch screen controller
+
+ * [PR-1800](https://github.com/apache/incubator-nuttx/pull/1800) vfs: Add
+ `FIOCLEX/FIONCLEX` ioctl support
+
+ * [PR-1798](https://github.com/apache/incubator-nuttx/pull/1798) mmcsd: Allow
+ setting `IDMODE_CLOCK` via kconfig
+
+ * [PR-1587](https://github.com/apache/incubator-nuttx/pull/1587) BCH: Delay the
+ sector flush to avoid multiple earse/write operations in sequence write
+
+ * [PR-1577](https://github.com/apache/incubator-nuttx/pull/1577) rwbuffer:
+ Avoid allocating memory for the temporary erase buffer by the FTL driver
+
+ * [PR-1466](https://github.com/apache/incubator-nuttx/pull/1466) Altair Modem:
+ Add board specific logic, Fix issue that SPI4 RX frequency violated AC Spec,
+ Fix priority of SPI transfer task is too low, Modify timeout value for RX ready
+
+ * [PR-1471](https://github.com/apache/incubator-nuttx/pull/1471) ramlog: Add
+ option to overwrite buffer
+
+ * [PR-1547](https://github.com/apache/incubator-nuttx/pull/1547) usbhub: Make
+ sure to enumerate hubs that report protocol = 1 (High Speed Hub)
+
+ * [PR-1374](https://github.com/apache/incubator-nuttx/pull/1374) gpio: Extend
+ gpio\_pintype\_e for pulldown/up and opendrain
+
+ * [PR-1249](https://github.com/apache/incubator-nuttx/pull/1249) bmp280: Add
+ support for reading temperature
+
+ * [PR-1299](https://github.com/apache/incubator-nuttx/pull/1299) mpu60x0: Add
+ I2C support for the MPU60x0 sensor driver
+
+ * [PR-1325](https://github.com/apache/incubator-nuttx/pull/1325) can: expose
+ NART/ABOM and RTR settings via ioctls
+
+ * [PR-1520](https://github.com/apache/incubator-nuttx/pull/1520) note: Move
+ note driver from syslog to drivers/note
+
+ * [PR-1288](https://github.com/apache/incubator-nuttx/pull/1288) / PR-1449
+ note: Add sched\_note\_syscall\_enter/leave hooks for syscall instrumentation
+
+ * [PR-1259](https://github.com/apache/incubator-nuttx/pull/1259) note: Add
+ buffering support for syscall instrumentation
+
+ * [PR-1256](https://github.com/apache/incubator-nuttx/pull/1256) note: Add
+ hooks for note driver for interrupt instrumentation
+
+Board Support -------------
+
+### **Significant Improvements**
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) metro-m4: Add
+ support for: SmartFS initialization, AT24 EEPROM, GPIO dev, BQ27426 gague

Review comment:
       gauge

##########
File path: ReleaseNotes
##########
@@ -27122,3 +27122,1268 @@ NuttX-9.1.0 Release Notes -------------------------
         - PR-176 cu: Handle NULL character correctly
         - PR-287 PR-290 examples: Update nxflat and thttpd Makefile's to fix
           a build breakage.
+
+NuttX-10.0.0 Release Notes
+------------------------
+
+## Major Changes to Core OS
+
+### New Features
+
+Major changes to the internal, OS timer (wdog) interfaces. The change includes:
+
+ * The wdog timer call backs used to support a variable number of arguments.
+Now they support only a single argument ([PR
+#1565](https://github.com/apache/incubator-nuttx/pull/1565)). This eliminates
+(1) the configuration option `CONFIG_MAX_WDOGPARMS` and the OS interfaces
+`wd_create()` and `wd_delete()` *   wdog timer data structures are no longer
+pre-allocated. Now they are allocated by the caller of `wd_start()`. This (1)
+eliminates the configuration options `CONFIG_PREALLOC_WDOGS` and
+`CONFIG_WDOG_INTRESERVE`, (2) eliminates the type `WDOG_ID` which was a pointer
+type to `struct wdog_s`, and (3) change the type of the first argument of all
+remaining wdog interfaces functions from `WDOG_ID` to `FAR struct wdog_s *`.
+
+Because of these changes, all proprietary drivers maintained by all NuttX users
+will require modification. The following summaries the required modifications:
+
+ * Most drivers have a field in structure like `WDOG_ID wdog`; That must be
+changed to `struct wdog_s wdog`; That changes the field from a pointer to a
+`struct wdog_s` to the `struct wdog_s` storage itself. *   Eliminate all calls
+to `wd_create()`. The `WDOG_ID` is not longer managed by the timing subsystem
+and the `wd_create()` interface has been removed. *   The `wd_delete()`
+interface has also been removed, but more care will need to be exercised:
+`wd_delete()` also cancels any running timer so, in many case, calls to
+`wd_delete()` should be replaced with calls to `wd_cancel()`. If you are certain
+that the timer has never been started, then you must remove the call to
+`wd_delete()` altogether. Calling `wd_cancel()` with an un-initialized s`truct
+wdog_s` instance may well cause a fatal crash. *   Replace the first parameter
+of all remaining wdog function calls from. For example, replace a call like `ret
+= wd_cancel(priv->wdog)` where `priv->wdog` was type `WDOG_ID` with the call
+`ret = wd_cancel(&priv->wdog)`where `priv->wdog` is now type `struct wdog_s`.
+
+ * [PR-1877](https://github.com/apache/incubator-nuttx/pull/1877) libc:
+ Implement "j" modifier for scanf
+
+ * [PR-1864](https://github.com/apache/incubator-nuttx/pull/1864) libc: fs: Add
+ relative path support
+
+ * [PR-1863](https://github.com/apache/incubator-nuttx/pull/1863) libc:
+ Implement `access()`
+
+ * [PR-1866](https://github.com/apache/incubator-nuttx/pull/1866) libc: uio:
+ enable `writev()` for sockets
+
+ * [PR-1853](https://github.com/apache/incubator-nuttx/pull/1853) libc:
+ Implement `popcount/popcountl/popcountll`
+
+ * [PR-1850](https://github.com/apache/incubator-nuttx/pull/1850) Add tool for
+ parsing the callstack for Trace32
+
+ * [PR-1840](https://github.com/apache/incubator-nuttx/pull/1840) Add POLLPRI
+ for exception condition on the file descriptor
+
+ * [PR-1828](https://github.com/apache/incubator-nuttx/pull/1828) Implement
+ mkdtemp syscall
+
+ * [PR-1826](https://github.com/apache/incubator-nuttx/pull/1826) libc: Add
+ "tm\_zone" member to tm
+
+ * [PR-1824](https://github.com/apache/incubator-nuttx/pull/1824) Implement
+ etpriority syscall
+
+ * [PR-1821](https://github.com/apache/incubator-nuttx/pull/1821) Implement
+ gettid syscall
+
+ * [PR-1818](https://github.com/apache/incubator-nuttx/pull/1818) Implement
+ pipe2 syscall
+
+ * [PR-1779](https://github.com/apache/incubator-nuttx/pull/1779) libc: Minimal
+ umask implementation
+
+ * [PR-1758](https://github.com/apache/incubator-nuttx/pull/1758) mm: Add lock
+ to protect call to mm\_addregion
+
+ * [PR-1756](https://github.com/apache/incubator-nuttx/pull/1756) libc:
+ Implement gethrtime, getrlimit, setrlimit
+
+ * [PR-1658](https://github.com/apache/incubator-nuttx/pull/1658) libc: Add
+ stubs for utimes
+
+ * [PR-1615](https://github.com/apache/incubator-nuttx/pull/1615) libc:
+ Implement tm::tm\_gmtoff field
+
+ * [PR-1611](https://github.com/apache/incubator-nuttx/pull/1611) libc: Allocate
+ file\_struct dynamically
+
+ * [PR-1684](https://github.com/apache/incubator-nuttx/pull/1684) Add gdb script
+ for NuttX thread debugging
+
+ * [PR-1607](https://github.com/apache/incubator-nuttx/pull/1607) mm: Implement
+ malloc\_usable\_size
+
+ * [PR-1606](https://github.com/apache/incubator-nuttx/pull/1606) sched/pthread:
+ Implement pthread\_attr\_detachstate
+
+ * [PR-1600](https://github.com/apache/incubator-nuttx/pull/1600) Implement
+ epol\_pwait and EPOLLONESHOT flag
+
+ * [PR-1597](https://github.com/apache/incubator-nuttx/pull/1597) sched: Support
+ passing non empty argument to init task
+
+ * [PR-1596](https://github.com/apache/incubator-nuttx/pull/1596) libc: Replace
+ all sem\_xxx with \_SEM\_XXX. This insures the correct semaphore interface is
+ used by userspace and the kernel.
+
+ * [PR-1517](https://github.com/apache/incubator-nuttx/pull/1517) sched/wdog:
+ Chang the default value of MAX\_WDOGPARMS from 4 to 2 as wd\_start is two every
+ where in the code base. Also bump CONFIG\_MAX\_WDOGPARAMS from 1 to 2 in
+ defconfigs to support pthread\_condclockwait()
+
+ * [PR-1486](https://github.com/apache/incubator-nuttx/pull/1486) libc:
+ Implement ftw and nftw functions
+
+ * [PR-1567](https://github.com/apache/incubator-nuttx/pull/1567) libc:
+ Implement proposed POSIX \_clockwait variants of \_timedwait functions
+
+ * [PR-1411](https://github.com/apache/incubator-nuttx/pull/1411) libxx:
+ Integrate latest uclibcxx 0.2.5
+
+ * [PR-1586](https://github.com/apache/incubator-nuttx/pull/1586) libc: Add open
+ for text (translated) access support
+
+ * [PR-1584](https://github.com/apache/incubator-nuttx/pull/1584) libc:
+ Implement strlcpy function
+
+ * [PR-1580](https://github.com/apache/incubator-nuttx/pull/1580) libc:
+ Implement pthread\_conattr\_etclock
+
+ * [PR-1545](https://github.com/apache/incubator-nuttx/pull/1545) sched/wdog: Do
+ not dynamically allocate wdog\_s. Reduces overhead and brings it inline with
+ work\_s
+
+ * [PR-1534](https://github.com/apache/incubator-nuttx/pull/1534) sched/wdog:
+ Replace all callback arguments from uint32\_t to wdparm\_t
+
+ * [PR-1420](https://github.com/apache/incubator-nuttx/pull/1420) libc: Do not
+ define localtime\[\_r\] to macro with CONFIG\_LIBC\_LOCALTIME is not defined.
+
+ * [PR-1375](https://github.com/apache/incubator-nuttx/pull/1375) libc: Always
+ declare getenv, link/symlink and atexist/on\_exit. Many C++ libraries reference
+ these but dont use them
+
+ * [PR-1371](https://github.com/apache/incubator-nuttx/pull/1371) libc: Improve
+ stat/readdir to be more POSIX compliant with S\_xxx macro definition as with
+ Linux
+
+ * [PR-1369](https://github.com/apache/incubator-nuttx/pull/1369) Initialize the
+ idle stack at the arch layer to better support stack coloring and also make it
+ compatible with new TLS implementation
+
+ * [PR-1292](https://github.com/apache/incubator-nuttx/pull/1292) pthread/mutex:
+ Add PTHREAD\_RECURSIVE\_MUTEX\_INITIALIZER\_NP support
+
+ * [PR-1280](https://github.com/apache/incubator-nuttx/pull/1280) libc:
+ Implement fseeko and ftello
+
+ * [PR-1279](https://github.com/apache/incubator-nuttx/pull/1279) libc:
+ Implement lstat and realpath
+
+ * [PR-1278](https://github.com/apache/incubator-nuttx/pull/1278) libc:
+ Implement pathconf and fpathconf
+
+ * [PR-1269](https://github.com/apache/incubator-nuttx/pull/1269) cstdlib: Add
+ missing atox to std namespace
+
+ * [PR-1264](https://github.com/apache/incubator-nuttx/pull/1264) sched/pthread:
+ Prohibit the use of pthread\_cleanup API's by kernel threads
+
+ * [PR-1440](https://github.com/apache/incubator-nuttx/pull/1440) libc: Add the
+ UUID libc functions
+
+ * [PR-1308](https://github.com/apache/incubator-nuttx/pull/1308) libc: Add
+ support for \_SC\_NPROCESSORS\_CONF/\_SC\_NPROCESSORS\_ONLN to sysconf
+
+ * [PR-1305](https://github.com/apache/incubator-nuttx/pull/1305) libc:
+ Implement WNOHANG for waitpid and waitid
+
+ * [PR-1237](https://github.com/apache/incubator-nuttx/pull/1237) libc: Add
+ minimal support for locale\_t operation: suplocale, freelocale, newlocale,
+ userlocale
+
+ * [PR-1317](https://github.com/apache/incubator-nuttx/pull/1317) sched/task:
+ Unify task initialization
+
+ * [PR-1187](https://github.com/apache/incubator-nuttx/pull/1187) sched: Unify
+ main thread and pthread behavior
+
+ * [PR-2263](https://github.com/apache/incubator-nuttx/pull/2263) libc/stdio:
+ Preallocate stdin, stdout, stderr
+
+ * [PR-2053](https://github.com/apache/incubator-nuttx/pull/2053)  *
+ [PR-2040](https://github.com/apache/incubator-nuttx/pull/2040) serial/termios:
+ Support custom baudrate setting
+
+### Bug Fixes
+
+ * [PR-1911](https://github.com/apache/incubator-nuttx/pull/1911) init\_section
+ was not being emitted resulting in C++ static constructors not being called.
+
+ * [PR-1889](https://github.com/apache/incubator-nuttx/pull/1889) Fix build
+ error for ::setbuf if CONFIG\_STDIO\_DISABLE\_BUFFERING is set
+
+ * [PR-1619](https://github.com/apache/incubator-nuttx/pull/1619) Fix inverted
+ errno in mq\_open
+
+ * [PR-1595](https://github.com/apache/incubator-nuttx/pull/1595) epoll\_wait()
+ must loop until "maxevents" to fille output evs array
+
+ * [PR-1519](https://github.com/apache/incubator-nuttx/pull/1519) libc: Replace
+ index/rindex from macro to function to protect against side effects with
+ conflicting local variables
+
+ * [PR-1514](https://github.com/apache/incubator-nuttx/pull/1514) Remove usage
+ for user-space memalign() from kernel/driver code. Instead use the proper
+ kernel memory interface.
+
+ * [PR-1512](https://github.com/apache/incubator-nuttx/pull/1512) /  *
+ [PR-1510](https://github.com/apache/incubator-nuttx/pull/1510) /  *
+ [PR-1507](https://github.com/apache/incubator-nuttx/pull/1507) Remove usage for
+ user-space malloc()/zalloc()/free() from kernel/driver code. Instead use the
+ proper kernel memory interface.
+
+ * [PR-1496](https://github.com/apache/incubator-nuttx/pull/1496) libc: Change
+ ctype macro to normal function to resolve macro evaluation side effects
+
+ * [PR-1463](https://github.com/apache/incubator-nuttx/pull/146) libc: Replace
+ all malloc/free with lib\_malloc/lib\_free inside libc
+
+ * [PR-1365](https://github.com/apache/incubator-nuttx/pull/1365) up\_assert
+ should not call exit() directly because it is only callable from userspace
+
+ * [PR-1336](https://github.com/apache/incubator-nuttx/pull/1336) syscall: Fix
+ prctl PR\_SET\_NAME failure if called without pid argument
+
+ * [PR-1289](https://github.com/apache/incubator-nuttx/pull/1289) Clear the
+ error indicator with rewind()
+
+ * [PR-1254](https://github.com/apache/incubator-nuttx/pull/1254) libc: mkstemp
+ only look at the trailing X's instead of the first X
+
+ * [PR-1311](https://github.com/apache/incubator-nuttx/pull/1311) libc: Move
+ double\_t typedef from sys/types.h to math.h
+
+ * [PR-1328](https://github.com/apache/incubator-nuttx/pull/1328) Make sure that
+ pthread\_cleanup functions are only called from userspace
+
+ * [PR-1318](https://github.com/apache/incubator-nuttx/pull/1318)
+ nxsched\_release\_tcb should release stack in kernel build, fixes memory leak
+
+ * [PR-2951](https://github.com/apache/incubator-nuttx/pull/2951) sched: Fix
+ deadlock in nxtask\_exit() for SMP
+
+ * [PR-2229](https://github.com/apache/incubator-nuttx/pulls/2229)  *
+ [PR-2298](https://github.com/apache/incubator-nuttx/pulls/2298)  *
+ [PR-2279](https://github.com/apache/incubator-nuttx/pulls/2279)  *
+ [PR-2272](https://github.com/apache/incubator-nuttx/pulls/2272)  *
+ [PR-2264](https://github.com/apache/incubator-nuttx/pulls/2264)  *
+ [PR-1992](https://github.com/apache/incubator-nuttx/pulls/1992)  *
+ [PR-2022](https://github.com/apache/incubator-nuttx/pulls/2022) sched: SMP
+ fixups that caused locking and removal of some no longer required workarounds
+
+ * [PR-1993](https://github.com/apache/incubator-nuttx/pull/1993) libc: Skip
+ close stdin/stdout/stderr in fclose
+
+ * [PR-1997](https://github.com/apache/incubator-nuttx/pull/1997) libc: Remove
+ all calls to fclose with stdin/stdout/stderr with fclose
+
+
+
+## Major Changes to Documentation
+
+ * [PR-1763](https://github.com/apache/incubator-nuttx/pulls/1763) Add
+ quickstart documentation
+
+ * [PR-1677](https://github.com/apache/incubator-nuttx/pull/1677) Add simulator,
+ drivers, and contributing instructions for new users
+
+ * [PR-1675](https://github.com/apache/incubator-nuttx/pull/1675) Add quickstart
+ documentation from NuttX Companion
+
+ * [PR-1673](https://github.com/apache/incubator-nuttx/pull/1673) Update all the
+ links in the documentation to point to nuttx.apache.org or the Apache NuttX
+ wiki instead of old nuttx.org resources
+
+ * [PR-1501](https://github.com/apache/incubator-nuttx/pull/1501) Port all the
+ existing documentation from HTML files to Sphinx based documentation along with
+ a bunch of updates and improvments
+
+ * [PR-1433](https://github.com/apache/incubator-nuttx/pull/1433) Convert README
+ documentation to Markdown
+
+## Major Changes to the Build System
+
+### New Features
+
+ * [PR-1786](https://github.com/apache/incubator-nuttx/pull/1786) Support
+ building external code into the OS
+
+ * [PR-1396](https://github.com/apache/incubator-nuttx/pull/1396) Make C/C++
+ search path common so all boards support uClibc++/libc++ automatically
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682) configure.sh
+ can now list configurations with "-L" option
+
+ * [PR-2023](https://github.com/apache/incubator-nuttx/pull/2023) tools: Remove
+ WSL configruation. This is just Linux now.
+
+### Bug Fixes
+
+ * [PR-1713](https://github.com/apache/incubator-nuttx/pull/1713) Fix export
+ target: libboard was missing KERNEL flag.
+
+ * [PR-1470](https://github.com/apache/incubator-nuttx/pull/1470) Fix Make.dep
+ not updated by .config changes
+
+ * [PR-1345](https://github.com/apache/incubator-nuttx/pull/1786) Enhance export
+ target: make BIN directory configurable, export post build script, use LDNAME
+ instead of LDSCRIPT
+
+ * [PR-1332](https://github.com/apache/incubator-nuttx/pull/1332) Include
+ incdir.c in the export target
+
+ * [PR-1995](https://github.com/apache/incubator-nuttx/pull/1995) Fix issue
+ where wrong extension was generated for mkconfig in WSL builds
+
+ * [PR-1949](https://github.com/apache/incubator-nuttx/pull/1949) Fix issue in
+ make export where nuttx-names.dat was not being generated
+
+ * [PR-1682](https://github.com/apache/incubator-nuttx/pull/1682): Fix issue
+ where windows style paths might not be handled correctly breaking Cygwin builds
+
+## Architectural Support
+
+### New Architecture Support
+
+ * [PR-1847](https://github.com/apache/incubator-nuttx/pull/1847) ARM: Initial
+ support for ARMV6M to support CortexM0+
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1379): EOSS3:
+ Initial support for the QuickLogic EOS S3 SoC
+
+### Architectures With Significant Improvements
+
+#### cxd56xx
+
+ * [PR-1753](https://github.com/apache/incubator-nuttx/pull/1753) cxd56xx: Use
+ spinlock in gpioint to improve SMP performance
+
+ * [PR-1650](https://github.com/apache/incubator-nuttx/pull/1650) cxd56xx: Use
+ spinlock in rtc to improve SMP performance
+
+ * [PR-1621](https://github.com/apache/incubator-nuttx/pull/1621) cxd56xx: Use
+ spinlock in serial to improve SMP performance
+
+ * [PR-1569](https://github.com/apache/incubator-nuttx/pull/1569) cxd56xx: Add
+ SMP support to cxd56\_farapi.c
+
+ * [PR-1689](https://github.com/apache/incubator-nuttx/pull/1689) cxd56xx: Use
+ spinlock in uart to improve SMP performance
+
+#### ESP32
+
+ * [PR-1422](https://github.com/apache/incubator-nuttx/pull/1422) ESP32: Add SPI
+ driver (Master & Slave)
+
+ * [PR-1435](https://github.com/apache/incubator-nuttx/pull/1435) ESP32: Add I2C
+ driver
+
+ * [PR-1491](https://github.com/apache/incubator-nuttx/pull/1491) ESP32: Add SPI
+ Flash driver
+
+ * [PR-1525](https://github.com/apache/incubator-nuttx/pull/1525) ESP32: Add
+ Ethernet driver
+
+ * [PR-1610](https://github.com/apache/incubator-nuttx/pull/1610) ESP32: Improve
+ SPI transmision (DMA, IOMUX, software CS)
+
+ * [PR-1630](https://github.com/apache/incubator-nuttx/pull/1630) ESP32: Add
+ support for HW RNG
+
+ * [PR-1830](https://github.com/apache/incubator-nuttx/pull/1830) ESP32: Add
+ Power Management of Force-Sleep
+
+ * [PR-1859](https://github.com/apache/incubator-nuttx/pull/1859) ESP32: Add
+ hist timer and improve the oneshot timer logic
+
+ * [PR-1754](https://github.com/apache/incubator-nuttx/pull/1754) ESP32: Add
+ support for external SPIFLASH
+
+ * [PR-1613](https://github.com/apache/incubator-nuttx/pull/1613) ESP32: Add
+ function for switching CPU from 80MHz to 240MHz
+
+PR-1712 ESP32: Add support for external MMCSD card over SPI
+
+#### IMXRT
+
+ * [PR-1868](https://github.com/apache/incubator-nuttx/pull/1868) IMXRT: Add ADC
+ driver
+
+#### Kinetis
+
+ * [PR-1624](https://github.com/apache/incubator-nuttx/pull/1624) Kinetis:
+ USBHOST improvements to avoid race condition durring freeing for queue head
+ structure by using Async Advance Doorbell.
+
+PR-1516 Kinetis K28: Add support for USB High Speed Host
+
+PR-1531 Kinetis K28: Add USB state change notifiers in notifier work queue
+
+PR-1456 Kinetis K28: Reworked USB driver for setup out data phase
+
+
+
+#### NRF52
+
+ * [PR-1418](https://github.com/apache/incubator-nuttx/pull/1418) NRF52: Add
+ Timer and RTC drivers
+
+ * [PR-1432](https://github.com/apache/incubator-nuttx/pull/1422) NRF52: Add
+ timer lowerhalf
+
+ * [PR-1635](https://github.com/apache/incubator-nuttx/pull/1635) NRF52: Add
+ support for RTC event handling
+
+ * [PR-1636](https://github.com/apache/incubator-nuttx/pull/1636) NRF52: Add
+ support for PPI peripheral
+
+ * [PR-1681](https://github.com/apache/incubator-nuttx/pull/1681) NRF52: Add
+ support for GPIOTE task mode
+
+ * [PR-1726](https://github.com/apache/incubator-nuttx/pull/1726) NRF52: Extend
+ systimer support
+
+ * [PR-1773](https://github.com/apache/incubator-nuttx/pull/1773) NRF52: Add ADC
+ and PWM support
+
+ * [PR-1915](https://github.com/apache/incubator-nuttx/pull/1915) NRF52: Add
+ serial termios support (no flow control)
+
+ * [PR-1907](https://github.com/apache/incubator-nuttx/pull/1907) NRF52: Add
+ basic error handing for i2c in polling mode to support i2ctool. Still not
+ handled in DMA mode.
+
+ * [PR-1839](https://github.com/apache/incubator-nuttx/pull/1839) NRF52: Add
+ missing SPI callback register hooks to support drivers like mmcsd
+
+ * [PR-1646](https://github.com/apache/incubator-nuttx/pull/1646) NRF52: Better
+ differentiation between NRF52840 and NRF52832
+
+PR-1685 NRF52: Add ARM system reset support. Add UID support.
+
+PR-1674 NRF52: Add LFCLK/HFCLK support for selecting oscillator sources.
+
+#### RISCV
+
+ * [PR-1858](https://github.com/apache/incubator-nuttx/pull/1858) RISCV: Add
+ missing CSR macros listed in RISC-V spec V1.10.
+
+PR-1314 rv32im: Add schedulesigaction.c, SYS\_save\_context handling, skip ECALL
+instruction when calling up\_swint()
+
+#### RX65N
+
+ * [PR-1622](https://github.com/apache/incubator-nuttx/pull/1622) RX65N: Add
+ I2C(RIIC) support
+
+ * [PR-1894](https://github.com/apache/incubator-nuttx/pull/1894) RX65N: Add USB
+ device support
+
+ * [PR-1899](https://github.com/apache/incubator-nuttx/pull/1899) RX65N: Add DTC
+ driver
+
+PR-1910 RX65N: Add SPI driver support
+
+#### SAMD5E5
+
+ * [PR-1515](https://github.com/apache/incubator-nuttx/pull/1515) SAMD5E5: Add
+ Watchdog timer support
+
+ * [PR-1574](https://github.com/apache/incubator-nuttx/pull/1574) SAMD5E5: Add
+ USB host support
+
+ * [PR-1594](https://github.com/apache/incubator-nuttx/pull/1594) SAMD5E5:
+ Freerun timer, oneshot timer and tickless support
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) SAMD5E5: Add
+ MTD progmem support and NVM USER PAGE IOTCLs
+
+#### SAMA5D2
+
+PR-1412 SAMA5D27: Implement system reset to support nsh reboot command
+
+PR-1393 SAMA5D2x: Implement SDMMC peripheral support
+
+#### S32K
+
+PR-1339 S32K: Extend FlexTimer support and add support for PWM
+
+PR-1337 S32K: Allow FlexCAN to use to NETDEV\_LATEINIT to handle the case where
+both FlexCAN and ENET are used
+
+#### SIM
+
+ * [PR-1914](https://github.com/apache/incubator-nuttx/pull/1914) SIM: SIGUSR1
+ handling now uses NuttX interrupt logic
+
+ * [PR-1767](https://github.com/apache/incubator-nuttx/pull/1767) SIM: Allow
+ access to tty interfaces for better termios support
+
+ * [PR-1655](https://github.com/apache/incubator-nuttx/pull/1655) SIM: Add
+ support for Linux HCI Socket as a NuttX BLE adapter. Full NuttX BLE stack can
+ be run against any Linux Bluetooth adapter in sim.
+
+ * [PR-1558](https://github.com/apache/incubator-nuttx/pull/1558) SIM: Add
+ support for Stack Smashing Protector.
+
+ * [PR-1392](https://github.com/apache/incubator-nuttx/pull/1392) SIM: Make
+ uClibc++ and libcxx work on sim platform
+
+ * [PR-1460](https://github.com/apache/incubator-nuttx/pull/1460) SIM: Call
+ sched\_note\_cpu\_\* when scheduler instrumentation is enabled
+
+#### STM32
+
+ * [PR-1865](https://github.com/apache/incubator-nuttx/pull/1865) STM32F4: Add
+ support for STM32F412CE fixing I2C2/I2C3 and USART1 alt
+
+ * [PR-1506](https://github.com/apache/incubator-nuttx/pull/1506) STM32: Add
+ support for single wire UART push/pull mode
+
+ * [PR-1572](https://github.com/apache/incubator-nuttx/pull/1572) STM32F2/F4:
+ Add options for I-Cache and D-Cache to be enabled/disable. Previously they were
+ always enabled.
+
+ * [PR-1287](https://github.com/apache/incubator-nuttx/pull/1286) STM32F7:
+ Refactor the FMC driver to support STM32F7 family and add support to the
+ STM32F46G-DISCO board
+
+ * [PR-1275](https://github.com/apache/incubator-nuttx/pull/1275) STM32: Allow
+ SysTick to be a tickless clock source option
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for STM32F412 with UART / SPI / CAN / I2C / DMA
+
+ * [PR-1250](https://github.com/apache/incubator-nuttx/pull/1250) STM32L4: Add
+ support for booting into DFU mode
+
+### Bug Fixes
+
+#### ARM
+
+ * [PR-1562](https://github.com/apache/incubator-nuttx/pull/1562) ARM: Save
+ tcb-adj\_stack\_size should be saved without tls overhead
+
+ * [PR-1900](https://github.com/apache/incubator-nuttx/pull/1900) ARM: Fix false
+ reporting for stack usage for unaligned stacks
+
+#### AVR
+
+ * [PR-1410](https://github.com/apache/incubator-nuttx/pull/1410) avr: Implement
+ missing double\_t type, CONFIG\_STACK\_ALIGNMENT, linker emulation flags
+
+#### CXD56xx
+
+ * [PR-1930](https://github.com/apache/incubator-nuttx/pull/1930) cxd56xx: Fix
+ handle\_irqreq() in cxd56\_cpupause.c
+
+ * [PR-1789](https://github.com/apache/incubator-nuttx/pull/1789) cxd56xx: Fix
+ deadlock issue in up\_txinit() in SMP mode.
+
+ * [PR-1620](https://github.com/apache/incubator-nuttx/pull/1620) cxd56xx: Fix
+ IRQ control in cxd56\_dmac.c
+
+ * [PR-1253](https://github.com/apache/incubator-nuttx/pull/1253) cxd56xx: Fix
+ audio cxd56\_stop where a deadlock could be hit if the worker thread took too
+ long to turn on AMP
+
+ * [PR-1950](https://github.com/apache/incubator-nuttx/pull/1950) cxd56xx: Fix
+ deadlock and tcb corruption in SMP mode
+
+#### ESP32
+
+ * [PR-1908](https://github.com/apache/incubator-nuttx/pull/1908) ESP32: Fix
+ task signal process preemption
+
+ * [PR-1941](https://github.com/apache/incubator-nuttx/pull/1941) ESP32: Fix
+ interrupt clearing of edge interrupt due to issuing in masking interrupt state
+
+#### IMXRT
+
+ * [PR-1527](https://github.com/apache/incubator-nuttx/pull/1527) IMXRT: Fix
+ kconfig so that IMXRT\_ENET\_NRXBUFFERS can be set
+
+ * [PR-1455](https://github.com/apache/incubator-nuttx/pull/1455) IMXRT: Fix
+ auto-negotiation for KSZ8081 PHY
+
+#### Kinetis
+
+ * [PR-1273](https://github.com/apache/incubator-nuttx/pull/1273) Kinetis: Fix
+ issue in ethernet driver where buffers were blindly initialized and could cause
+ the TX of the MAC to be in a bad state. Also resolves an issue with interrupts
+ being throttled in the NVIC.
+
+#### NRF52
+
+ * [PR-1928](https://github.com/apache/incubator-nuttx/pull/1928) NRF52: Fix PPI
+ group disable and add group clear
+
+ * [PR-1885](https://github.com/apache/incubator-nuttx/pull/1885) NRF52: Fix SPI
+ driver structures when SPI\_EXCHANGE is not set
+
+ * [PR-1799](https://github.com/apache/incubator-nuttx/pull/1799) NRF52: Fix
+ SPI\_MASTER entry in kconfig
+
+ * [PR-1787](https://github.com/apache/incubator-nuttx/pull/1787) NRF52: Fix
+ base address for SPIM{1,2,3}
+
+ * [PR-1777](https://github.com/apache/incubator-nuttx/pull/1777) NRF52: Handle
+ case where rx or tx buffer could be 0 but data would still be transferred. Also
+ error if more than max data is requested.
+
+ * [PR-1770](https://github.com/apache/incubator-nuttx/pull/1770) NRF52: Fix bug
+ where SPI cmddata was not properly mapped for SPIM 0,2,3
+
+#### RISC-V
+
+ * [PR-1909](https://github.com/apache/incubator-nuttx/pull/1909) RISC-V: MIE
+ instead of MPIE register was being used in up\_schedule\_sigaction for storing
+ interrupt state
+
+#### SIM
+
+ * [PR-1903](https://github.com/apache/incubator-nuttx/pull/1903) SIM: Fix
+ complication issue for WPCAP in Cygwin build
+
+ * [PR-1888](https://github.com/apache/incubator-nuttx/pull/1888) SIM: Fix
+ EOVERFLOW returned when CONFIG\_SIM\_M32 is set
+
+ * [PR-1709](https://github.com/apache/incubator-nuttx/pull/1709) SIM: Fix
+ up\_cpu\_start initialization for macOS with SMP enabled
+
+#### STM32
+
+ * [PR-1898](https://github.com/apache/incubator-nuttx/pull/1898) STM32F7: Fixes
+ data loss bug in UART5 with TX DMA
+
+ * [PR-1841](https://github.com/apache/incubator-nuttx/pull/1841) STM32: Remove
+ broken overdriver support
+
+ * [PR-1719](https://github.com/apache/incubator-nuttx/pull/1719) STM32:
+ Lowputc: Ensure USART is disabled before attempting to configuring it
+
+ * [PR-1714](https://github.com/apache/incubator-nuttx/pull/1714) STM32H7: Fix
+ I2C driver interrupt storm
+
+ * [PR-1556](https://github.com/apache/incubator-nuttx/pull/1556) STM32: Fix IO
+ compentation support in STM32F7 and remove incorrect reference in STM32F0/L0/G0
+
+ * [PR-1529](https://github.com/apache/incubator-nuttx/pull/1529) STM32: Fix
+ intialization bug in ADC that prevented adc\_reset() from working correctly
+
+ * [PR-1561](https://github.com/apache/incubator-nuttx/pull/1561) STM32: Make
+ sure that core over-drive is enable for all chips that support it and operating
+ at 180MHz. Some were enabled at 180MHz but may have not been stable without
+ over-drive not configured.
+
+ * [PR-1553](https://github.com/apache/incubator-nuttx/pull/1553) STM32F7: Fix
+ possible interrupt blocking in serial TXDMA ISR
+
+ * [PR-1544](https://github.com/apache/incubator-nuttx/pull/1544) STM32: Make
+ sure IO compenstation cell is configured prior to call to
+ rcc\_enableperipherals() causing syscfg is accessed before it is enabled
+
+ * [PR-1380](https://github.com/apache/incubator-nuttx/pull/1380) STM32F7: Fix
+ tickless driverw where th compare register could be set to a value that has
+ just passed preventing expiration
+
+ * [PR-1252](https://github.com/apache/incubator-nuttx/pull/1252) STM32L4: Fix
+ 48MHz MSI clock seclection that could cause boot to hang
+
+ * [PR-1310](https://github.com/apache/incubator-nuttx/pull/1310) STM32L4:
+ Configure flash wait states earier to prevent corruption of execution state
+
+ * [PR-1248](https://github.com/apache/incubator-nuttx/pull/1248) STM32L4: Fix
+ oneshot timer so that a minimum period is set otherwise it will never be
+ triggered.
+
+ * [PR-1247](https://github.com/apache/incubator-nuttx/pull/1247) STM32L47x/8x:
+ Set additional registers require to place a pin in analog mode
+
+ * [PR-1246](https://github.com/apache/incubator-nuttx/pull/1246) STM32L4: Fix
+ issue where clock divider for serial baud rate was not set correctly
+
+#### Miscellaneous
+
+ * [PR-1912](https://github.com/apache/incubator-nuttx/pull/1912) Fix
+ up\_interrupt\_contex() in case of SMP - Make sure the operation is atomic in
+ case of SMP
+
+## Driver Support
+
+### Bug Fixes
+
+ * [PR-1896](https://github.com/apache/incubator-nuttx/pull/1896) spi\_xx25xx
+ EEPROM: return the number of bytes written instead of 0 or error
+
+ * [PR-1891](https://github.com/apache/incubator-nuttx/pull/1891) serial: Don't
+ mangle PID when ISIG is changed
+
+ * [PR-1856](https://github.com/apache/incubator-nuttx/pull/1856) pipe: In case
+ of empty pipe with no writers, return EOF instead of EAGAIN
+
+ * [PR-1836](https://github.com/apache/incubator-nuttx/pull/1836) stmpe811: Fix
+ incorrect GPIO interrupt register logic
+
+ * [PR-1741](https://github.com/apache/incubator-nuttx/pull/1741) mmcsd\_sdio:
+ Properly arm the write completion detection
+
+ * [PR-1370](https://github.com/apache/incubator-nuttx/pull/1370) can: Fix
+ incorret usage of nxsem\_getvalue which caused fifo->rx\_sem to increase with
+ teach received msg
+
+ * [PR-1452](https://github.com/apache/incubator-nuttx/pull/1452) lcd: Fix
+ memory leak when board\_graphics\_setup fail
+
+
+
+### New Driver Support
+
+ * [PR-1797](https://github.com/apache/incubator-nuttx/pull/1797) leds: WS2812
+ LED controller (aka Adafruit NeoPixel)
+
+ * [PR-1851](https://github.com/apache/incubator-nuttx/pull/1851) kbd: Add
+ support for SolderParty BlackBerry Q10 Keyboard
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) BQ27426 fuel
+ gauge
+
+ * [PR-1276](https://github.com/apache/incubator-nuttx/pull/1276) Add support
+ for the ST7735 TFT Controller
+
+ * [PR-1233](https://github.com/apache/incubator-nuttx/pull/1233) usbhost: Add
+ support for CDC-MBIM USB host driver
+
+### Drivers With Significant Improvements
+
+ * [PR-1816](https://github.com/apache/incubator-nuttx/pull/1816) stmpe811: Add
+ SPI support for touch screen controller
+
+ * [PR-1800](https://github.com/apache/incubator-nuttx/pull/1800) vfs: Add
+ `FIOCLEX/FIONCLEX` ioctl support
+
+ * [PR-1798](https://github.com/apache/incubator-nuttx/pull/1798) mmcsd: Allow
+ setting `IDMODE_CLOCK` via kconfig
+
+ * [PR-1587](https://github.com/apache/incubator-nuttx/pull/1587) BCH: Delay the
+ sector flush to avoid multiple earse/write operations in sequence write
+
+ * [PR-1577](https://github.com/apache/incubator-nuttx/pull/1577) rwbuffer:
+ Avoid allocating memory for the temporary erase buffer by the FTL driver
+
+ * [PR-1466](https://github.com/apache/incubator-nuttx/pull/1466) Altair Modem:
+ Add board specific logic, Fix issue that SPI4 RX frequency violated AC Spec,
+ Fix priority of SPI transfer task is too low, Modify timeout value for RX ready
+
+ * [PR-1471](https://github.com/apache/incubator-nuttx/pull/1471) ramlog: Add
+ option to overwrite buffer
+
+ * [PR-1547](https://github.com/apache/incubator-nuttx/pull/1547) usbhub: Make
+ sure to enumerate hubs that report protocol = 1 (High Speed Hub)
+
+ * [PR-1374](https://github.com/apache/incubator-nuttx/pull/1374) gpio: Extend
+ gpio\_pintype\_e for pulldown/up and opendrain
+
+ * [PR-1249](https://github.com/apache/incubator-nuttx/pull/1249) bmp280: Add
+ support for reading temperature
+
+ * [PR-1299](https://github.com/apache/incubator-nuttx/pull/1299) mpu60x0: Add
+ I2C support for the MPU60x0 sensor driver
+
+ * [PR-1325](https://github.com/apache/incubator-nuttx/pull/1325) can: expose
+ NART/ABOM and RTR settings via ioctls
+
+ * [PR-1520](https://github.com/apache/incubator-nuttx/pull/1520) note: Move
+ note driver from syslog to drivers/note
+
+ * [PR-1288](https://github.com/apache/incubator-nuttx/pull/1288) / PR-1449
+ note: Add sched\_note\_syscall\_enter/leave hooks for syscall instrumentation
+
+ * [PR-1259](https://github.com/apache/incubator-nuttx/pull/1259) note: Add
+ buffering support for syscall instrumentation
+
+ * [PR-1256](https://github.com/apache/incubator-nuttx/pull/1256) note: Add
+ hooks for note driver for interrupt instrumentation
+
+Board Support -------------
+
+### **Significant Improvements**
+
+ * [PR-1618](https://github.com/apache/incubator-nuttx/pull/1618) metro-m4: Add
+ support for: SmartFS initialization, AT24 EEPROM, GPIO dev, BQ27426 gague
+ initialization
+
+ * [PR-1727](https://github.com/apache/incubator-nuttx/pull/1729) b-g474e-dpow1:
+ Add support for FLASH bootloader
+
+ * [PR-1683](https://github.com/apache/incubator-nuttx/pull/1683) cxd56xx: Add
+ wifi\_smp configuration
+
+ * [PR-1668](https://github.com/apache/incubator-nuttx/pull/1668) sim: Add new
+ configuration for SMP
+
+ * [PR-1644](https://github.com/apache/incubator-nuttx/pull/1644)
+ stm32f746g-disco: Move serial console from USART6 to USART1 which is attached
+ to the USB virtual COM port.
+
+ * [PR-1464](https://github.com/apache/incubator-nuttx/pull/1464) cxd56xx: Add
+ new GNSS functions, support for lower PWM frequency,
+ CONFIG\_CPUFREQ\_RELEASE\_LOCK, high speed ADC, HPADC input gain configuration,
+ eMMC device, frame buffer support
+
+ * [PR-1405](https://github.com/apache/incubator-nuttx/pull/1405)
+ stm32f4discovery: Add ELF support to wifi configuration
+
+ * [PR-1402](https://github.com/apache/incubator-nuttx/pull/1402) imxrt1060: Add
+ buttons support to iMXRT1060
+
+ * [PR-1590](https://github.com/apache/incubator-nuttx/pull/1590) sim: Add
+ duktape configuration
+
+ * [PR-1532](https://github.com/apache/incubator-nuttx/pull/1532) sim: Add
+ cromfs configuration
+
+ * [PR-1335](https://github.com/apache/incubator-nuttx/pull/1335) cxd56xx:
+ Enable basic snapshop camera example
+
+### New Board Support
+
+ * [PR-1664](https://github.com/apache/incubator-nuttx/pull/1664) NRF52: Add
+ support for NRF52832 MakerDiary MDK board
+
+ * [PR-1633](https://github.com/apache/incubator-nuttx/pull/1633) NRF52: Add
+ support for Sparkfun NRF52832 Breakout Board
+
+ * [PR-1728](https://github.com/apache/incubator-nuttx/pull/1728) SAMA5D27: Add
+ support for Giant Board
+
+ * [PR-1397](https://github.com/apache/incubator-nuttx/pull/1397) EOSS3: Initial
+ support for the QuickLogic EOS S3 SoC QuickFeather board
+
+ * [PR-1268](https://github.com/apache/incubator-nuttx/pull/1268) STM32: Add
+ support for nucleo-f412zg board
+
+File System -----------
+
+### **Bug Fixes**
+
+ * [PR-1796](https://github.com/apache/incubator-nuttx/pull/1796) vfs: Fix
+ memory leak calling `pseudorename`
+
+ * [PR-1794](https://github.com/apache/incubator-nuttx/pull/1794) vfs: Fix issue
+ where opendir would remove the trailing whitespace or /
+
+ * [PR-1793](https://github.com/apache/incubator-nuttx/pull/1793) vfs: Make sure
+ that rename of mount point uses pseudorename. Previously mv on a mountpoint
+ would return err 88.
+
+ * [PR-1737](https://github.com/apache/incubator-nuttx/pull/1737) vfs: reuse
+ file\_dup2 direction in file\_dup to prevent segfault issue
+
+ * [PR-1490](https://github.com/apache/incubator-nuttx/pull/1490) Insure that

Review comment:
       Ensure




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[GitHub] [incubator-nuttx] btashton commented on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

btashton commented on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-727640211


   > Did you manually convert it to markdown?
   > 
   > We need to do the same to the [template](https://cwiki.apache.org/confluence/display/NUTTX/Release+Notes+Template+-+NuttX+X.Y) and then be able to just copy paste from Confluence.
   
   I agree it was annoying and I would say I did a marginal/okay job.  Basically I exported the confluence page as HTML then used turndown https://domchristie.github.io/turndown/ tweaked it a bit and ran it through rewrap to get the line lengths under control.
   
   It would be better if we just did it in markdown in the first place.  I think the issues there might be I dont know how well Confluence lets multiple people edit at the same place.  There might be a better solution for that.  Something we can think about going forward.


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[GitHub] [incubator-nuttx] btashton commented on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

btashton commented on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-734128659


   Thanks @acassis I made all your corrections.  Could someone go ahead and merged this @xiaoxiang781216 @Ouss4.  It is only a text file change so I don't think we need to wait for CI.  I'll also open the PR for the 10.0 branch


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[GitHub] [incubator-nuttx] btashton edited a comment on pull request #2308: Add release notes for NuttX-10.0.0

Posted by GitBox <gi...@apache.org>.

btashton edited a comment on pull request #2308:
URL: https://github.com/apache/incubator-nuttx/pull/2308#issuecomment-727640211


   > Did you manually convert it to markdown?
   > 
   > We need to do the same to the [template](https://cwiki.apache.org/confluence/display/NUTTX/Release+Notes+Template+-+NuttX+X.Y) and then be able to just copy paste from Confluence.
   
   I agree it was annoying and I would say I did a marginal/okay job.  Basically I exported the confluence page as HTML then used turndown https://domchristie.github.io/turndown/ tweaked it a bit and ran it through rewrap to get the line lengths under control.
   
   It would be better if we just did it in markdown in the first place.  I think the issues there might be I dont know how well Confluence lets multiple people edit at markdown the same time.  There might be a better solution for that.  Something we can think about going forward.


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