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Posted to commits@nuttx.apache.org by gi...@apache.org on 2026/03/18 00:43:57 UTC
(nuttx-website) branch asf-site updated: Publishing web: 996a476878b0fdf6bea181c31cdcf607aa247bc3 docs: f7614f640f80447418d46e52adc148c4f33ab5e8
This is an automated email from the ASF dual-hosted git repository.
github-bot pushed a commit to branch asf-site
in repository https://gitbox.apache.org/repos/asf/nuttx-website.git
The following commit(s) were added to refs/heads/asf-site by this push:
new 04c1cbddbd Publishing web: 996a476878b0fdf6bea181c31cdcf607aa247bc3 docs: f7614f640f80447418d46e52adc148c4f33ab5e8
04c1cbddbd is described below
commit 04c1cbddbd8586581882c85bee8978a76308b49e
Author: Abhishek Mishra <mi...@gmail.com>
AuthorDate: Wed Mar 18 00:42:48 2026 +0000
Publishing web: 996a476878b0fdf6bea181c31cdcf607aa247bc3 docs: f7614f640f80447418d46e52adc148c4f33ab5e8
---
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index 47a9a906e2..ed74e779d4 100644
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<p class="caption"><span class="caption-text">Table of Contents</span></p>
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-<p>Last Updated: 17 March 26 at 00:22</p>
+<p>Last Updated: 18 March 26 at 00:23</p>
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-<p>Last Updated: 17 March 26 at 00:22</p>
+<p>Last Updated: 18 March 26 at 00:23</p>
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<p class="caption"><span class="caption-text">Table of Contents</span></p>
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-<p>Last Updated: 17 March 26 at 00:22</p>
+<p>Last Updated: 18 March 26 at 00:23</p>
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index 0520411369..35f0a09baf 100644
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-<p>Last Updated: 17 March 26 at 00:23</p>
+<p>Last Updated: 18 March 26 at 00:23</p>
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index b847befed4..3d6acdc6ce 100644
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-<p>Last Updated: 17 March 26 at 00:23</p>
+<p>Last Updated: 18 March 26 at 00:24</p>
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index 54532653b3..80c0b2b81c 100644
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-<p>Last Updated: 17 March 26 at 00:23</p>
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<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
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--- a/content/docs/12.12.0/guides/fully_linked_elf.html
+++ b/content/docs/12.12.0/guides/fully_linked_elf.html
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<div class="admonition-here-is-an-alternative-minimal-and-possibly-outdated-version admonition">
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{
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VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments (such
as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:38</p>
+<p>Last Updated: 18 March 26 at 00:38</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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-<p>Last Updated: 17 March 26 at 00:23</p>
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<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
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-<p>Last Updated: 17 March 26 at 00:24</p>
+<p>Last Updated: 18 March 26 at 00:25</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
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-<p>Last Updated: 17 March 26 at 00:24</p>
+<p>Last Updated: 18 March 26 at 00:25</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments (such
as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:24</p>
+<p>Last Updated: 18 March 26 at 00:25</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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VxWorks) are adopted for functionality not available under these standards, or
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as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:26</p>
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<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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-<p>Last Updated: 17 March 26 at 00:27</p>
+<p>Last Updated: 18 March 26 at 00:28</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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VxWorks) are adopted for functionality not available under these standards, or
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as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:28</p>
+<p>Last Updated: 18 March 26 at 00:29</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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-<p>Last Updated: 17 March 26 at 00:30</p>
+<p>Last Updated: 18 March 26 at 00:30</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
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-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/benchmarks/iozone/index", "applications/bench [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/benchmarks/iozone/index", "applications/bench [...]
\ No newline at end of file
diff --git a/content/docs/12.8.0/index.html b/content/docs/12.8.0/index.html
index 3f1b9ebcc4..4e2a14c74e 100644
--- a/content/docs/12.8.0/index.html
+++ b/content/docs/12.8.0/index.html
@@ -183,7 +183,7 @@ standards. Additional standard APIs from Unix and other common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments (such
as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:31</p>
+<p>Last Updated: 18 March 26 at 00:32</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.8.0/searchindex.js b/content/docs/12.8.0/searchindex.js
index 1f37aa6cf5..81dbbdb3b4 100644
--- a/content/docs/12.8.0/searchindex.js
+++ b/content/docs/12.8.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/benchmarks/iozone/index", "applications/bench [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/benchmarks/iozone/index", "applications/bench [...]
\ No newline at end of file
diff --git a/content/docs/12.9.0/index.html b/content/docs/12.9.0/index.html
index aa496b5e27..11d223a464 100644
--- a/content/docs/12.9.0/index.html
+++ b/content/docs/12.9.0/index.html
@@ -183,7 +183,7 @@ standards. Additional standard APIs from Unix and other common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments (such
as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:33</p>
+<p>Last Updated: 18 March 26 at 00:33</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.9.0/searchindex.js b/content/docs/12.9.0/searchindex.js
index 62ea9fefcc..a92c897fc2 100644
--- a/content/docs/12.9.0/searchindex.js
+++ b/content/docs/12.9.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/cyclictest/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/b [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index", "applications/audioutils/index", "applications/audioutils/mml_parser/index", "applications/audioutils/nxaudio/index", "applications/benchmarks/cachespeed/index", "applications/benchmarks/coremark-pro/index", "applications/benchmarks/coremark/index", "applications/benchmarks/cyclictest/index", "applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index", "applications/benchmarks/index", "applications/b [...]
\ No newline at end of file
diff --git a/content/docs/latest/_sources/components/drivers/special/mmcsd.rst.txt b/content/docs/latest/_sources/components/drivers/special/mmcsd.rst.txt
index 5ba08b325b..2cd2b5d9d0 100644
--- a/content/docs/latest/_sources/components/drivers/special/mmcsd.rst.txt
+++ b/content/docs/latest/_sources/components/drivers/special/mmcsd.rst.txt
@@ -4,3 +4,7 @@ MMCSD Device Drivers
- ``include/nuttx/mmcsd.h``. All structures and APIs needed to
work with MMCSD drivers are provided in this header file.
+
+Implementers of SDIO lower-half drivers should refer to the
+:doc:`SDIO Driver Documentation <sdio>` for details on R2/CSD response
+handling and correctly implementing the lower-half interface.
diff --git a/content/docs/latest/_sources/components/drivers/special/sdio.rst.txt b/content/docs/latest/_sources/components/drivers/special/sdio.rst.txt
index d03f8ecedc..6822b82d38 100644
--- a/content/docs/latest/_sources/components/drivers/special/sdio.rst.txt
+++ b/content/docs/latest/_sources/components/drivers/special/sdio.rst.txt
@@ -31,3 +31,45 @@ SDIO Device Drivers
- **Examples**: ``arch/arm/src/stm32/stm32_sdio.c`` and
``drivers/mmcsd/mmcsd_sdio.c``
+
+Implementing an SDIO lower-half
+===============================
+
+When implementing a new SDMMC controller driver (SDIO lower-half), it must
+provide the interface defined in ``struct sdio_dev_s``.
+
+Call-flow (simplified example)
+------------------------------
+
+The full SDIO/MMCSD call-flow for card identification and initialization
+is more complex and includes additional commands (e.g., CMD0, CMD8,
+ACMD41 / CMD1, CMD2, CMD3, error handling, retries, etc.). For the
+purposes of documenting the R2/CID/CSD handling expected from the
+lower-half, a simplified interaction around CMD9 looks like this:
+
+1. ``SDIO_SENDCMD``: Send the command that yields an R2 response
+ (e.g., CMD2 for CID, CMD9 for CSD).
+2. ``SDIO_WAITRESPONSE``: Poll for the hardware to complete the command.
+3. ``SDIO_RECVR2``: Retrieve the 136-bit response and provide the
+ decoded 128-bit CID/CSD payload to the MMCSD upper-half.
+
+For the complete card initialization and command sequence, refer to the
+card initialization flowchart in the MMC/SD physical layer
+specification.
+
+R2 (136-bit) response and CSD/CID
+---------------------------------
+
+The standard R2 response format includes a 7-bit CRC that many hardware
+controllers automatically verify and strip. The MMCSD upper-half expects the
+provided 128-bit buffer to contain the CID or CSD payload in its standard
+layout (bits 127-0).
+
+If the controller strips the CRC byte, the remaining bits in the hardware
+registers are often misaligned (shifted). The lower-half MUST shift the four
+32-bit words left by one byte (8 bits) before returning them via ``recv_r2``
+if the CRC is not included in the registers.
+
+Refer to ``arch/arm64/src/bcm2711/bcm2711_sdio.c`` or
+``arch/arm64/src/imx9/imx9_usdhc.c`` for reference implementations of this
+shifting logic.
diff --git a/content/docs/latest/_sources/debugging/index.rst.txt b/content/docs/latest/_sources/debugging/index.rst.txt
index 50bc1c6e5a..0f65ebe3a6 100644
--- a/content/docs/latest/_sources/debugging/index.rst.txt
+++ b/content/docs/latest/_sources/debugging/index.rst.txt
@@ -16,6 +16,7 @@ This page contains a collection of guides on how to debug problems with NuttX.
coresight.rst
stackcheck.rst
stackrecord.rst
+ stackusage.rst
disabling_stackdumpdebug.rst
debuggingflash_nuttxonarm.rst
cortexmhardfaults.rst
diff --git a/content/docs/latest/_sources/debugging/stackusage.rst.txt b/content/docs/latest/_sources/debugging/stackusage.rst.txt
new file mode 100644
index 0000000000..9a024aadc4
--- /dev/null
+++ b/content/docs/latest/_sources/debugging/stackusage.rst.txt
@@ -0,0 +1,159 @@
+===========================
+Static Stack Usage Analysis
+===========================
+
+Overview
+========
+
+``tools/stackusage.py`` performs static stack usage analysis by reading
+DWARF ``.debug_frame`` data from an ELF file. It extracts per-function
+stack sizes from CFA (Canonical Frame Address) offsets and optionally
+builds a call graph via disassembly to compute worst-case total stack
+depth.
+
+- **Self** – stack bytes used by the function itself (max CFA offset).
+- **Total** – worst-case stack depth through the deepest call chain
+ (self + callees). A marker prefix flags uncertain values.
+
+Dependencies
+============
+
+The tool invokes standard toolchain binaries:
+
+- **readelf** – symbol table and DWARF frame info
+- **objdump** – disassembly for call graph analysis
+- **addr2line** – source file and line resolution
+
+Both GNU and LLVM toolchains are supported. Use ``-p`` to set the
+toolchain prefix (e.g. ``-p arm-none-eabi-`` for GCC,
+``-p llvm-`` for LLVM).
+
+The ELF must contain DWARF debug info (``-g`` or ``-gdwarf``).
+No special Kconfig option is needed.
+
+Usage
+=====
+
+Analyze a native ELF (no prefix needed)::
+
+ python3 tools/stackusage.py nuttx
+
+Cross-compiled ELF with GCC toolchain::
+
+ python3 tools/stackusage.py -p arm-none-eabi- nuttx
+
+Cross-compiled ELF with LLVM toolchain::
+
+ python3 tools/stackusage.py -p llvm- nuttx
+
+Show top 20 functions::
+
+ python3 tools/stackusage.py -p arm-none-eabi- -n 20 nuttx
+
+Estimate recursion depth of 10::
+
+ python3 tools/stackusage.py -p arm-none-eabi- -r 10 nuttx
+
+Command Line Options
+====================
+
+.. code-block:: text
+
+ positional arguments:
+ elf path to ELF file with DWARF debug info
+
+ options:
+ -p, --prefix PREFIX toolchain prefix (e.g. arm-none-eabi- or llvm-)
+ -n, --rank N show top N functions (default: 0 = all)
+ -r, --recursion-depth N
+ assumed recursion depth (default: 0)
+
+Text Output
+===========
+
+The default output is an aligned table. Each function's deepest
+backtrace is shown with one frame per row. The ``Self`` column shows
+each frame's own stack cost. The ``Backtrace`` column shows the
+function name followed by its code size in parentheses (when available
+from the symbol table), e.g. ``main(128)``. The entry point of each
+call chain is suffixed with ``~``.
+
+Example (``nucleo-f429zi:trace``, ``-n 3``)::
+
+ Total Self Backtrace File:Line
+ ----- ---- --------------------------- -------------------------------------------
+ @2344 56 telnetd_main(236)~ apps/system/telnetd/telnetd.c:42
+ ^24 nsh_telnetmain(128) apps/nshlib/nsh_telnetd.c:48
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+ @224 nsh_parse_cmdparm(1024) apps/nshlib/nsh_parse.c:2362
+ @96 nsh_execute(512) apps/nshlib/nsh_parse.c:510
+ ^56 nsh_builtin(320) apps/nshlib/nsh_builtin.c:76
+ 88 exec_builtin(256) apps/builtin/exec_builtin.c:61
+ ...
+ ^64 file_vopen(192) nuttx/fs/vfs/fs_open.c:124
+ ...
+ @2328 16 sh_main(64)~ apps/system/nsh/sh_main.c:40
+ 16 nsh_system_ctty(96) apps/nshlib/nsh_system.c:105
+ ^32 nsh_system_(160) apps/nshlib/nsh_system.c:41
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+ @2312 24 nsh_main(80)~ apps/system/nsh/nsh_main.c:54
+ ^24 nsh_consolemain(48) apps/nshlib/nsh_consolemain.c:65
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+
+Uncertainty markers on both Total and Self columns indicate the most
+significant reason:
+
+======= ==========================================
+Marker Meaning
+======= ==========================================
+``~`` entry point of the call chain (suffix)
+``?`` no DWARF data (self counted as zero)
+``*`` dynamic stack (alloca or VLA)
+``@`` recursion detected
+``^`` indirect call (function pointer)
+======= ==========================================
+
+Uncertainty Reasons
+===================
+
+====================================== =========================================
+Reason Description
+====================================== =========================================
+recursion: A->B->...->A Recursive cycle detected. Use ``-r N``
+ to estimate.
+indirect call (function pointer) Callee unknown at compile time.
+no DWARF data No ``.debug_frame`` entry; self counted
+ as zero.
+dynamic stack (alloca/VLA) Function uses ``alloca()`` or
+ variable-length arrays; self is a
+ minimum.
+====================================== =========================================
+
+Uncertainty propagates upward: if any callee in the deepest path is
+uncertain the caller is also marked uncertain.
+
+Recursion Depth Estimation
+==========================
+
+By default (``-r 0``) recursive back-edges contribute zero stack.
+With ``-r N`` (N > 0) the tool estimates::
+
+ cycle_body_cost × N
+
+For example ``A(64) -> B(32) -> A``::
+
+ cycle_body_cost = 64 + 32 = 96
+ -r 10 → 96 × 10 = 960 bytes
+
+The result is still marked uncertain.
+
+Supported Architectures
+=======================
+
+Any architecture supported by the toolchain's ``readelf``,
+``objdump``, and ``addr2line`` is supported. This includes
+ARM, AArch64, x86, x86_64, MIPS, RISC-V, Xtensa, PowerPC, SPARC,
+TriCore, SuperH, and others.
diff --git a/content/docs/latest/_sources/platforms/risc-v/esp32c3/index.rst.txt b/content/docs/latest/_sources/platforms/risc-v/esp32c3/index.rst.txt
index 4e6f911e63..24ac4e407f 100644
--- a/content/docs/latest/_sources/platforms/risc-v/esp32c3/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/risc-v/esp32c3/index.rst.txt
@@ -350,7 +350,7 @@ The following list indicates the state of peripherals' support in NuttX:
Peripheral Support NOTES
=========== ======= ====================
ADC Yes Oneshot
-AES No
+AES Yes
Bluetooth Yes
CAN/TWAI Yes
DMA No
diff --git a/content/docs/latest/_sources/platforms/risc-v/esp32c6/index.rst.txt b/content/docs/latest/_sources/platforms/risc-v/esp32c6/index.rst.txt
index 04970c47cc..7a58a99390 100644
--- a/content/docs/latest/_sources/platforms/risc-v/esp32c6/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/risc-v/esp32c6/index.rst.txt
@@ -340,7 +340,7 @@ The following list indicates the state of peripherals' support in NuttX:
Peripheral Support NOTES
============== ======= ====================
ADC Yes Oneshot and internal temperature sensor
-AES No
+AES Yes
Bluetooth No
CAN/TWAI Yes
DMA Yes
diff --git a/content/docs/latest/_sources/platforms/risc-v/esp32h2/index.rst.txt b/content/docs/latest/_sources/platforms/risc-v/esp32h2/index.rst.txt
index 2cfecc9207..8b8936a441 100644
--- a/content/docs/latest/_sources/platforms/risc-v/esp32h2/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/risc-v/esp32h2/index.rst.txt
@@ -339,7 +339,7 @@ The following list indicates the state of peripherals' support in NuttX:
Peripheral Support NOTES
============== ======= ====================
ADC Yes Oneshot and internal temperature sensor
-AES No
+AES Yes
Bluetooth No
CAN/TWAI Yes
DMA Yes
diff --git a/content/docs/latest/_sources/platforms/risc-v/esp32p4/index.rst.txt b/content/docs/latest/_sources/platforms/risc-v/esp32p4/index.rst.txt
index f8bac1e743..42d92d5452 100644
--- a/content/docs/latest/_sources/platforms/risc-v/esp32p4/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/risc-v/esp32p4/index.rst.txt
@@ -306,7 +306,7 @@ TRNG No
ECDSA No
TEE No
APM No
-AES No
+AES Yes
Digital Signature No
Secure Boot No
XTS_AES No
diff --git a/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt b/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
index ca1be4f5b0..1b34b84357 100644
--- a/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
@@ -376,7 +376,7 @@ The following list indicates the state of peripherals' support in NuttX:
Peripheral Support NOTES
========== ======= =====
ADC Yes Oneshot
-AES No
+AES Yes
CAN/TWAI Yes
DAC No
DMA Yes
diff --git a/content/docs/latest/components/drivers/special/index.html b/content/docs/latest/components/drivers/special/index.html
index b85a40a018..43b9f78744 100644
--- a/content/docs/latest/components/drivers/special/index.html
+++ b/content/docs/latest/components/drivers/special/index.html
@@ -767,7 +767,14 @@ and thus expose them to applications.</p>
</li>
</ul>
</li>
-<li class="toctree-l1"><a class="reference internal" href="sdio.html">SDIO Device Drivers</a></li>
+<li class="toctree-l1"><a class="reference internal" href="sdio.html">SDIO Device Drivers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="sdio.html#implementing-an-sdio-lower-half">Implementing an SDIO lower-half</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="sdio.html#call-flow-simplified-example">Call-flow (simplified example)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sdio.html#r2-136-bit-response-and-csd-cid">R2 (136-bit) response and CSD/CID</a></li>
+</ul>
+</li>
+</ul>
+</li>
<li class="toctree-l1"><a class="reference internal" href="usbdev.html">USB Device-Side Drivers</a></li>
<li class="toctree-l1"><a class="reference internal" href="usbhost.html">USB Host-Side Drivers</a></li>
<li class="toctree-l1"><a class="reference internal" href="usbmisc.html">USB Miscellaneous Drivers</a></li>
diff --git a/content/docs/latest/components/drivers/special/mmcsd.html b/content/docs/latest/components/drivers/special/mmcsd.html
index 3cee3b419c..70d061550c 100644
--- a/content/docs/latest/components/drivers/special/mmcsd.html
+++ b/content/docs/latest/components/drivers/special/mmcsd.html
@@ -254,6 +254,9 @@
<li><p><code class="docutils literal notranslate"><span class="pre">include/nuttx/mmcsd.h</span></code>. All structures and APIs needed to
work with MMCSD drivers are provided in this header file.</p></li>
</ul>
+<p>Implementers of SDIO lower-half drivers should refer to the
+<a class="reference internal" href="sdio.html"><span class="doc">SDIO Driver Documentation</span></a> for details on R2/CSD response
+handling and correctly implementing the lower-half interface.</p>
</section>
diff --git a/content/docs/latest/components/drivers/special/sdio.html b/content/docs/latest/components/drivers/special/sdio.html
index 05df6d5b6b..77c3be2b33 100644
--- a/content/docs/latest/components/drivers/special/sdio.html
+++ b/content/docs/latest/components/drivers/special/sdio.html
@@ -162,7 +162,10 @@
<li class="toctree-l4"><a class="reference internal" href="segger.html">Segger RTT drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="spi.html">SPI Device Drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="syslog.html">SYSLOG</a></li>
-<li class="toctree-l4 current"><a class="current reference internal" href="#">SDIO Device Drivers</a></li>
+<li class="toctree-l4 current"><a class="current reference internal" href="#">SDIO Device Drivers</a><ul>
+<li class="toctree-l5"><a class="reference internal" href="#implementing-an-sdio-lower-half">Implementing an SDIO lower-half</a></li>
+</ul>
+</li>
<li class="toctree-l4"><a class="reference internal" href="usbdev.html">USB Device-Side Drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="usbhost.html">USB Host-Side Drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="usbmisc.html">USB Miscellaneous Drivers</a></li>
@@ -276,6 +279,43 @@ higher level device driver.</p></li>
<li><p><strong>Examples</strong>: <code class="docutils literal notranslate"><span class="pre">arch/arm/src/stm32/stm32_sdio.c</span></code> and
<code class="docutils literal notranslate"><span class="pre">drivers/mmcsd/mmcsd_sdio.c</span></code></p></li>
</ul>
+<section id="implementing-an-sdio-lower-half">
+<h2>Implementing an SDIO lower-half<a class="headerlink" href="#implementing-an-sdio-lower-half" title="Permalink to this heading"></a></h2>
+<p>When implementing a new SDMMC controller driver (SDIO lower-half), it must
+provide the interface defined in <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">sdio_dev_s</span></code>.</p>
+<section id="call-flow-simplified-example">
+<h3>Call-flow (simplified example)<a class="headerlink" href="#call-flow-simplified-example" title="Permalink to this heading"></a></h3>
+<p>The full SDIO/MMCSD call-flow for card identification and initialization
+is more complex and includes additional commands (e.g., CMD0, CMD8,
+ACMD41 / CMD1, CMD2, CMD3, error handling, retries, etc.). For the
+purposes of documenting the R2/CID/CSD handling expected from the
+lower-half, a simplified interaction around CMD9 looks like this:</p>
+<ol class="arabic simple">
+<li><p><code class="docutils literal notranslate"><span class="pre">SDIO_SENDCMD</span></code>: Send the command that yields an R2 response
+(e.g., CMD2 for CID, CMD9 for CSD).</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">SDIO_WAITRESPONSE</span></code>: Poll for the hardware to complete the command.</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">SDIO_RECVR2</span></code>: Retrieve the 136-bit response and provide the
+decoded 128-bit CID/CSD payload to the MMCSD upper-half.</p></li>
+</ol>
+<p>For the complete card initialization and command sequence, refer to the
+card initialization flowchart in the MMC/SD physical layer
+specification.</p>
+</section>
+<section id="r2-136-bit-response-and-csd-cid">
+<h3>R2 (136-bit) response and CSD/CID<a class="headerlink" href="#r2-136-bit-response-and-csd-cid" title="Permalink to this heading"></a></h3>
+<p>The standard R2 response format includes a 7-bit CRC that many hardware
+controllers automatically verify and strip. The MMCSD upper-half expects the
+provided 128-bit buffer to contain the CID or CSD payload in its standard
+layout (bits 127-0).</p>
+<p>If the controller strips the CRC byte, the remaining bits in the hardware
+registers are often misaligned (shifted). The lower-half MUST shift the four
+32-bit words left by one byte (8 bits) before returning them via <code class="docutils literal notranslate"><span class="pre">recv_r2</span></code>
+if the CRC is not included in the registers.</p>
+<p>Refer to <code class="docutils literal notranslate"><span class="pre">arch/arm64/src/bcm2711/bcm2711_sdio.c</span></code> or
+<code class="docutils literal notranslate"><span class="pre">arch/arm64/src/imx9/imx9_usdhc.c</span></code> for reference implementations of this
+shifting logic.</p>
+</section>
+</section>
</section>
diff --git a/content/docs/latest/debugging/coredump.html b/content/docs/latest/debugging/coredump.html
index 3b6071c533..4d40338747 100644
--- a/content/docs/latest/debugging/coredump.html
+++ b/content/docs/latest/debugging/coredump.html
@@ -156,6 +156,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
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diff --git a/content/docs/latest/debugging/coresight.html b/content/docs/latest/debugging/coresight.html
index c45b4914a6..0ec0fc5281 100644
--- a/content/docs/latest/debugging/coresight.html
+++ b/content/docs/latest/debugging/coresight.html
@@ -155,6 +155,7 @@
</li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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diff --git a/content/docs/latest/debugging/cortexmhardfaults.html b/content/docs/latest/debugging/cortexmhardfaults.html
index de2892ded4..70b745f21c 100644
--- a/content/docs/latest/debugging/cortexmhardfaults.html
+++ b/content/docs/latest/debugging/cortexmhardfaults.html
@@ -150,6 +150,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Analyzing Cortex-M Hardfaults</a><ul>
diff --git a/content/docs/latest/debugging/debugging_elf_loadable_modules.html b/content/docs/latest/debugging/debugging_elf_loadable_modules.html
index d3a69fc8ed..5d02de3e12 100644
--- a/content/docs/latest/debugging/debugging_elf_loadable_modules.html
+++ b/content/docs/latest/debugging/debugging_elf_loadable_modules.html
@@ -158,6 +158,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
diff --git a/content/docs/latest/debugging/debuggingflash_nuttxonarm.html b/content/docs/latest/debugging/debuggingflash_nuttxonarm.html
index a841436efa..5efa4f3641 100644
--- a/content/docs/latest/debugging/debuggingflash_nuttxonarm.html
+++ b/content/docs/latest/debugging/debuggingflash_nuttxonarm.html
@@ -150,6 +150,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#what-s-the-problem">What’s the problem?</a></li>
diff --git a/content/docs/latest/debugging/disabling_stackdumpdebug.html b/content/docs/latest/debugging/disabling_stackdumpdebug.html
index 9fbc5ba971..8bf1ae397a 100644
--- a/content/docs/latest/debugging/disabling_stackdumpdebug.html
+++ b/content/docs/latest/debugging/disabling_stackdumpdebug.html
@@ -47,7 +47,7 @@
<link rel="index" title="Index" href="../genindex.html" />
<link rel="search" title="Search" href="../search.html" />
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+ <link rel="prev" title="Static Stack Usage Analysis" href="stackusage.html" />
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@@ -150,6 +150,7 @@
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+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
@@ -209,7 +210,7 @@ the board configuration:</p>
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index d54f011674..3ed2822116 100644
--- a/content/docs/latest/debugging/gdb/irqinfo.html
+++ b/content/docs/latest/debugging/gdb/irqinfo.html
@@ -163,6 +163,7 @@
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<li class="toctree-l2"><a class="reference internal" href="../stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../stackusage.html">Static Stack Usage Analysis</a></li>
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diff --git a/content/docs/latest/debugging/gdbserver.html b/content/docs/latest/debugging/gdbserver.html
index 7bf90f010d..8690720a3f 100644
--- a/content/docs/latest/debugging/gdbserver.html
+++ b/content/docs/latest/debugging/gdbserver.html
@@ -159,6 +159,7 @@
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+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
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diff --git a/content/docs/latest/debugging/gdbwithpython.html b/content/docs/latest/debugging/gdbwithpython.html
index 8a714c31b3..daabb5677a 100644
--- a/content/docs/latest/debugging/gdbwithpython.html
+++ b/content/docs/latest/debugging/gdbwithpython.html
@@ -159,6 +159,7 @@
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
diff --git a/content/docs/latest/debugging/gprof.html b/content/docs/latest/debugging/gprof.html
index 16e017d020..f9b900201a 100644
--- a/content/docs/latest/debugging/gprof.html
+++ b/content/docs/latest/debugging/gprof.html
@@ -174,6 +174,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
diff --git a/content/docs/latest/debugging/index.html b/content/docs/latest/debugging/index.html
index 1b9a10f64d..d477115217 100644
--- a/content/docs/latest/debugging/index.html
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@@ -150,6 +150,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
@@ -352,6 +353,17 @@
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html#notice">Notice</a></li>
</ul>
</li>
+<li class="toctree-l1"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#overview">Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#dependencies">Dependencies</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#usage">Usage</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#command-line-options">Command Line Options</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#text-output">Text Output</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#uncertainty-reasons">Uncertainty Reasons</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#recursion-depth-estimation">Recursion Depth Estimation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html#supported-architectures">Supported Architectures</a></li>
+</ul>
+</li>
<li class="toctree-l1"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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diff --git a/content/docs/latest/debugging/kasan.html b/content/docs/latest/debugging/kasan.html
index ec4579dd71..2b896590d3 100644
--- a/content/docs/latest/debugging/kasan.html
+++ b/content/docs/latest/debugging/kasan.html
@@ -163,6 +163,7 @@
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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diff --git a/content/docs/latest/debugging/mte.html b/content/docs/latest/debugging/mte.html
index 9557ed2f6e..7af346dd23 100644
--- a/content/docs/latest/debugging/mte.html
+++ b/content/docs/latest/debugging/mte.html
@@ -150,6 +150,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
diff --git a/content/docs/latest/debugging/qemugdb.html b/content/docs/latest/debugging/qemugdb.html
index a7563a8de9..ecd31b2bf2 100644
--- a/content/docs/latest/debugging/qemugdb.html
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@@ -155,6 +155,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
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<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
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diff --git a/content/docs/latest/debugging/stackcheck.html b/content/docs/latest/debugging/stackcheck.html
index af08cfa812..0303b982d7 100644
--- a/content/docs/latest/debugging/stackcheck.html
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@@ -158,6 +158,7 @@
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
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diff --git a/content/docs/latest/debugging/stackrecord.html b/content/docs/latest/debugging/stackrecord.html
index 02b2803c73..26e192afc8 100644
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<script src="../_static/js/theme.js"></script>
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@@ -157,6 +157,7 @@
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</ul>
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+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
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@@ -280,7 +281,7 @@ the entry function with the noinstrument_function flag to prevent instrumentatio
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+<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Static Stack Usage Analysis</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#overview">Overview</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#dependencies">Dependencies</a></li>
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+
+ <section id="static-stack-usage-analysis">
+<h1>Static Stack Usage Analysis<a class="headerlink" href="#static-stack-usage-analysis" title="Permalink to this heading"></a></h1>
+<section id="overview">
+<h2>Overview<a class="headerlink" href="#overview" title="Permalink to this heading"></a></h2>
+<p><code class="docutils literal notranslate"><span class="pre">tools/stackusage.py</span></code> performs static stack usage analysis by reading
+DWARF <code class="docutils literal notranslate"><span class="pre">.debug_frame</span></code> data from an ELF file. It extracts per-function
+stack sizes from CFA (Canonical Frame Address) offsets and optionally
+builds a call graph via disassembly to compute worst-case total stack
+depth.</p>
+<ul class="simple">
+<li><p><strong>Self</strong> – stack bytes used by the function itself (max CFA offset).</p></li>
+<li><p><strong>Total</strong> – worst-case stack depth through the deepest call chain
+(self + callees). A marker prefix flags uncertain values.</p></li>
+</ul>
+</section>
+<section id="dependencies">
+<h2>Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this heading"></a></h2>
+<p>The tool invokes standard toolchain binaries:</p>
+<ul class="simple">
+<li><p><strong>readelf</strong> – symbol table and DWARF frame info</p></li>
+<li><p><strong>objdump</strong> – disassembly for call graph analysis</p></li>
+<li><p><strong>addr2line</strong> – source file and line resolution</p></li>
+</ul>
+<p>Both GNU and LLVM toolchains are supported. Use <code class="docutils literal notranslate"><span class="pre">-p</span></code> to set the
+toolchain prefix (e.g. <code class="docutils literal notranslate"><span class="pre">-p</span> <span class="pre">arm-none-eabi-</span></code> for GCC,
+<code class="docutils literal notranslate"><span class="pre">-p</span> <span class="pre">llvm-</span></code> for LLVM).</p>
+<p>The ELF must contain DWARF debug info (<code class="docutils literal notranslate"><span class="pre">-g</span></code> or <code class="docutils literal notranslate"><span class="pre">-gdwarf</span></code>).
+No special Kconfig option is needed.</p>
+</section>
+<section id="usage">
+<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this heading"></a></h2>
+<p>Analyze a native ELF (no prefix needed):</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>python3 tools/stackusage.py nuttx
+</pre></div>
+</div>
+<p>Cross-compiled ELF with GCC toolchain:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>python3 tools/stackusage.py -p arm-none-eabi- nuttx
+</pre></div>
+</div>
+<p>Cross-compiled ELF with LLVM toolchain:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>python3 tools/stackusage.py -p llvm- nuttx
+</pre></div>
+</div>
+<p>Show top 20 functions:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>python3 tools/stackusage.py -p arm-none-eabi- -n 20 nuttx
+</pre></div>
+</div>
+<p>Estimate recursion depth of 10:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>python3 tools/stackusage.py -p arm-none-eabi- -r 10 nuttx
+</pre></div>
+</div>
+</section>
+<section id="command-line-options">
+<h2>Command Line Options<a class="headerlink" href="#command-line-options" title="Permalink to this heading"></a></h2>
+<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>positional arguments:
+ elf path to ELF file with DWARF debug info
+
+options:
+ -p, --prefix PREFIX toolchain prefix (e.g. arm-none-eabi- or llvm-)
+ -n, --rank N show top N functions (default: 0 = all)
+ -r, --recursion-depth N
+ assumed recursion depth (default: 0)
+</pre></div>
+</div>
+</section>
+<section id="text-output">
+<h2>Text Output<a class="headerlink" href="#text-output" title="Permalink to this heading"></a></h2>
+<p>The default output is an aligned table. Each function’s deepest
+backtrace is shown with one frame per row. The <code class="docutils literal notranslate"><span class="pre">Self</span></code> column shows
+each frame’s own stack cost. The <code class="docutils literal notranslate"><span class="pre">Backtrace</span></code> column shows the
+function name followed by its code size in parentheses (when available
+from the symbol table), e.g. <code class="docutils literal notranslate"><span class="pre">main(128)</span></code>. The entry point of each
+call chain is suffixed with <code class="docutils literal notranslate"><span class="pre">~</span></code>.</p>
+<p>Example (<code class="docutils literal notranslate"><span class="pre">nucleo-f429zi:trace</span></code>, <code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">3</span></code>):</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Total Self Backtrace File:Line
+----- ---- --------------------------- -------------------------------------------
+@2344 56 telnetd_main(236)~ apps/system/telnetd/telnetd.c:42
+ ^24 nsh_telnetmain(128) apps/nshlib/nsh_telnetd.c:48
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+ @224 nsh_parse_cmdparm(1024) apps/nshlib/nsh_parse.c:2362
+ @96 nsh_execute(512) apps/nshlib/nsh_parse.c:510
+ ^56 nsh_builtin(320) apps/nshlib/nsh_builtin.c:76
+ 88 exec_builtin(256) apps/builtin/exec_builtin.c:61
+ ...
+ ^64 file_vopen(192) nuttx/fs/vfs/fs_open.c:124
+ ...
+@2328 16 sh_main(64)~ apps/system/nsh/sh_main.c:40
+ 16 nsh_system_ctty(96) apps/nshlib/nsh_system.c:105
+ ^32 nsh_system_(160) apps/nshlib/nsh_system.c:41
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+@2312 24 nsh_main(80)~ apps/system/nsh/nsh_main.c:54
+ ^24 nsh_consolemain(48) apps/nshlib/nsh_consolemain.c:65
+ ^48 nsh_session(400) apps/nshlib/nsh_session.c:73
+ ...
+</pre></div>
+</div>
+<p>Uncertainty markers on both Total and Self columns indicate the most
+significant reason:</p>
+<table class="docutils align-default">
+<thead>
+<tr class="row-odd"><th class="head"><p>Marker</p></th>
+<th class="head"><p>Meaning</p></th>
+</tr>
+</thead>
+<tbody>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">~</span></code></p></td>
+<td><p>entry point of the call chain (suffix)</p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">?</span></code></p></td>
+<td><p>no DWARF data (self counted as zero)</p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">*</span></code></p></td>
+<td><p>dynamic stack (alloca or VLA)</p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">@</span></code></p></td>
+<td><p>recursion detected</p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">^</span></code></p></td>
+<td><p>indirect call (function pointer)</p></td>
+</tr>
+</tbody>
+</table>
+</section>
+<section id="uncertainty-reasons">
+<h2>Uncertainty Reasons<a class="headerlink" href="#uncertainty-reasons" title="Permalink to this heading"></a></h2>
+<table class="docutils align-default">
+<thead>
+<tr class="row-odd"><th class="head"><p>Reason</p></th>
+<th class="head"><p>Description</p></th>
+</tr>
+</thead>
+<tbody>
+<tr class="row-even"><td><p>recursion: A->B->…->A</p></td>
+<td><p>Recursive cycle detected. Use <code class="docutils literal notranslate"><span class="pre">-r</span> <span class="pre">N</span></code>
+to estimate.</p></td>
+</tr>
+<tr class="row-odd"><td><p>indirect call (function pointer)</p></td>
+<td><p>Callee unknown at compile time.</p></td>
+</tr>
+<tr class="row-even"><td><p>no DWARF data</p></td>
+<td><p>No <code class="docutils literal notranslate"><span class="pre">.debug_frame</span></code> entry; self counted
+as zero.</p></td>
+</tr>
+<tr class="row-odd"><td><p>dynamic stack (alloca/VLA)</p></td>
+<td><p>Function uses <code class="docutils literal notranslate"><span class="pre">alloca()</span></code> or
+variable-length arrays; self is a
+minimum.</p></td>
+</tr>
+</tbody>
+</table>
+<p>Uncertainty propagates upward: if any callee in the deepest path is
+uncertain the caller is also marked uncertain.</p>
+</section>
+<section id="recursion-depth-estimation">
+<h2>Recursion Depth Estimation<a class="headerlink" href="#recursion-depth-estimation" title="Permalink to this heading"></a></h2>
+<p>By default (<code class="docutils literal notranslate"><span class="pre">-r</span> <span class="pre">0</span></code>) recursive back-edges contribute zero stack.
+With <code class="docutils literal notranslate"><span class="pre">-r</span> <span class="pre">N</span></code> (N > 0) the tool estimates:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>cycle_body_cost × N
+</pre></div>
+</div>
+<p>For example <code class="docutils literal notranslate"><span class="pre">A(64)</span> <span class="pre">-></span> <span class="pre">B(32)</span> <span class="pre">-></span> <span class="pre">A</span></code>:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>cycle_body_cost = 64 + 32 = 96
+-r 10 → 96 × 10 = 960 bytes
+</pre></div>
+</div>
+<p>The result is still marked uncertain.</p>
+</section>
+<section id="supported-architectures">
+<h2>Supported Architectures<a class="headerlink" href="#supported-architectures" title="Permalink to this heading"></a></h2>
+<p>Any architecture supported by the toolchain’s <code class="docutils literal notranslate"><span class="pre">readelf</span></code>,
+<code class="docutils literal notranslate"><span class="pre">objdump</span></code>, and <code class="docutils literal notranslate"><span class="pre">addr2line</span></code> is supported. This includes
+ARM, AArch64, x86, x86_64, MIPS, RISC-V, Xtensa, PowerPC, SPARC,
+TriCore, SuperH, and others.</p>
+</section>
+</section>
+
+
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diff --git a/content/docs/latest/debugging/tasktrace.html b/content/docs/latest/debugging/tasktrace.html
index 4b29716887..e6168db5d2 100644
--- a/content/docs/latest/debugging/tasktrace.html
+++ b/content/docs/latest/debugging/tasktrace.html
@@ -154,6 +154,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
diff --git a/content/docs/latest/debugging/tasktraceinternal.html b/content/docs/latest/debugging/tasktraceinternal.html
index b712c79667..e4656f5fe2 100644
--- a/content/docs/latest/debugging/tasktraceinternal.html
+++ b/content/docs/latest/debugging/tasktraceinternal.html
@@ -169,6 +169,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
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index d12add053d..290cf1e948 100644
--- a/content/docs/latest/debugging/tasktraceuser.html
+++ b/content/docs/latest/debugging/tasktraceuser.html
@@ -180,6 +180,7 @@
<li class="toctree-l2"><a class="reference internal" href="coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
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index 2a99fd87c8..6cf0b01e01 100644
--- a/content/docs/latest/guides/fully_linked_elf.html
+++ b/content/docs/latest/guides/fully_linked_elf.html
@@ -482,7 +482,7 @@ NuttX package: <code class="docutils literal notranslate"><span class="pre">nutt
<div class="admonition-here-is-an-alternative-minimal-and-possibly-outdated-version admonition">
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--- a/content/docs/latest/guides/partially_linked_elf.html
+++ b/content/docs/latest/guides/partially_linked_elf.html
@@ -508,7 +508,7 @@ NuttX package: <code class="docutils literal notranslate"><span class="pre">nutt
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VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments (such
as fork()).</p>
-<p>Last Updated: 17 March 26 at 00:40</p>
+<p>Last Updated: 18 March 26 at 00:40</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of Contents</span></p>
<ul class="current">
@@ -342,6 +342,7 @@ as fork()).</p>
<li class="toctree-l2"><a class="reference internal" href="debugging/coresight.html">Coresight - HW Assisted Tracing on ARM</a></li>
<li class="toctree-l2"><a class="reference internal" href="debugging/stackcheck.html">Stack Overflow Check</a></li>
<li class="toctree-l2"><a class="reference internal" href="debugging/stackrecord.html">Run time stack statistics</a></li>
+<li class="toctree-l2"><a class="reference internal" href="debugging/stackusage.html">Static Stack Usage Analysis</a></li>
<li class="toctree-l2"><a class="reference internal" href="debugging/disabling_stackdumpdebug.html">Disabling the Stack Dump During Debugging</a></li>
<li class="toctree-l2"><a class="reference internal" href="debugging/debuggingflash_nuttxonarm.html">Debugging / flashing NuttX on ARM with hardware debugger (JTAG/SWD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="debugging/cortexmhardfaults.html">Analyzing Cortex-M Hardfaults</a></li>
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+++ b/content/docs/latest/platforms/risc-v/esp32c3/index.html
@@ -629,7 +629,7 @@ functions that were being executed when the crash occurred.</p>
<td><p>Oneshot</p></td>
</tr>
<tr class="row-odd"><td><p>AES</p></td>
-<td><p>No</p></td>
+<td><p>Yes</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>Bluetooth</p></td>
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index bb986eb145..55a017cdb9 100644
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+++ b/content/docs/latest/platforms/risc-v/esp32c6/index.html
@@ -616,7 +616,7 @@ Backtrace for task 0:
<td><p>Oneshot and internal temperature sensor</p></td>
</tr>
<tr class="row-odd"><td><p>AES</p></td>
-<td><p>No</p></td>
+<td><p>Yes</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>Bluetooth</p></td>
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index ebf2225f7d..ecbd5cca92 100644
--- a/content/docs/latest/platforms/risc-v/esp32h2/index.html
+++ b/content/docs/latest/platforms/risc-v/esp32h2/index.html
@@ -605,7 +605,7 @@ Backtrace for task 0:
<td><p>Oneshot and internal temperature sensor</p></td>
</tr>
<tr class="row-odd"><td><p>AES</p></td>
-<td><p>No</p></td>
+<td><p>Yes</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>Bluetooth</p></td>
diff --git a/content/docs/latest/platforms/risc-v/esp32p4/index.html b/content/docs/latest/platforms/risc-v/esp32p4/index.html
index ca4712daf8..3adadc4c64 100644
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+++ b/content/docs/latest/platforms/risc-v/esp32p4/index.html
@@ -699,7 +699,7 @@ board documentation for what is enabled by default.</p>
<td></td>
</tr>
<tr class="row-even"><td><p>AES</p></td>
-<td><p>No</p></td>
+<td><p>Yes</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>Digital Signature</p></td>
diff --git a/content/docs/latest/platforms/xtensa/esp32s2/index.html b/content/docs/latest/platforms/xtensa/esp32s2/index.html
index d0be2e67cf..3f188238df 100644
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<td><p>Oneshot</p></td>
</tr>
<tr class="row-odd"><td><p>AES</p></td>
-<td><p>No</p></td>
+<td><p>Yes</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>CAN/TWAI</p></td>
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