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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/11/09 14:30:48 UTC
[GitHub] [incubator-nuttx] GooTal opened a new issue, #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
GooTal opened a new issue, #7566:
URL: https://github.com/apache/incubator-nuttx/issues/7566
Hello there,
I\`m trying to port NuttX to LoongArch, which is used in 64-bit microcontroller.
Currently i`m a student and hope to learn some OS knowledge during porting.
Is it a good choice to take riscv-k210 as a referrence?
I\`m planning to read documents from official NuttX website.
I\`ve glanced some code snippets and found the code for uart, interrupt and so on. But i didn`t find out how the memoy page table was established (Sorry for my poor knowledge). Can i get some help about memory mapping? Like: the layout of virtual memory.
Could you tell me something about the proper process of porting NuttX? Maybe start with head.S, uart, memory mapping...and something else?
Thanks a lot :)
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[GitHub] [nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1340310013
Hi @acassis , is the [porting guide](https://cwiki.apache.org/confluence/display/NUTTX/Porting+Guide) still in maintenance?
Is there a git repo for the porting guide? Maybe it\`s more convenient to maintain and discuss details of the doc in a git repo.
Thanks.
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[GitHub] [nuttx] xiaoxiang781216 commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1340363507
> Hi, i want to make sure that NuttX is fully open source, right?
Yes, all OS component and the bundle apps(https://github.com/apache/nuttx-apps) are open source with Apache license(some are MIT/BSD etc), you can reference here for more info:
https://github.com/apache/nuttx/blob/master/LICENSE
> I investigated another RTOS namely rt-thread, but some libraries of rt-thread is prebuilt (not open source), thus making it difficult for me to debug or continue learning. Thanks for your time again.
But some chip drivers(especially WiFi/BLE firmware) is released by the static library.
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[GitHub] [incubator-nuttx] acassis commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
acassis commented on issue #7566:
URL: https://github.com/apache/incubator-nuttx/issues/7566#issuecomment-1308908913
Hi @GooTal I think LoongArch (from 龙芯) is based on MIPS instruction set. We have support for MIPS, but not for MIPS 64-bit yet. Since riscv-k210 is RISC-V 64-bit and RISC-V ISA is similar to MIPS maybe it could be a good starting point.
You can use our old Porting Guide ( https://cwiki.apache.org/confluence/display/NUTTX/Porting+Guide ) as reference, but always comparing with the source code because some functions name and files could have changed or moved to other places. If you can document the Porting Process to create a new documentation to include on our new Documentation site: https://nuttx.apache.org/docs/latest/ it will be welcome!
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[GitHub] [nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1370622182
Hi, i\`m trying to add some config items in Kconfig files. I notice that there is a `$ARCH` variable in `${TOPDIR}/Kconfig` file. I think it may stand for host cpu arch. But i couldn\`t find out where the definition is.
Here are the steps:
In ${TOPDIR}
```
./tools/configure.sh -l maix-bit:nsh
make menuconfig
```
As you can see, the mainmenu is "NuttX/x86_64 Configuration"
Thanks for your time~
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[GitHub] [incubator-nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/incubator-nuttx/issues/7566#issuecomment-1309612090
Alright, thank you!
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[GitHub] [incubator-nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/incubator-nuttx/issues/7566#issuecomment-1316189498
Hi, i want to make sure that NuttX is fully open source, right?
I investigated another RTOS namely rt-thread, but some libraries of rt-thread is prebuilt (not open source), thus making it difficult for me to debug or continue learning.
Thanks for your time again.
--
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[GitHub] [nuttx] xiaoxiang781216 commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1340359285
> Hi @acassis , is the [porting guide](https://cwiki.apache.org/confluence/display/NUTTX/Porting+Guide) still in maintenance?
>
Here is he new location: https://nuttx.apache.org/docs/latest/reference/os/index.html
> Is there a git repo for the porting guide? Maybe it`s more convenient to maintain and discuss details of the doc in a git repo.
>
Yes, it's here: https://github.com/apache/nuttx/tree/master/Documentation
you can send the change to github directly, the website will automatically update to contain your modification once the patch get merged.
> Thanks.
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[GitHub] [nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1340414624
Thanks a lot @xiaoxiang781216!
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[GitHub] [nuttx] TimJTi commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by GitBox <gi...@apache.org>.
TimJTi commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1370855370
I believe this is set via the “System Type” menu at the top level.
You may know this (I only recently learnt about it) but if not then: if you type a forward slash while in the menuconfig it brings up a search. If you search for ARCH it points you to line 161 of arch/Kconfig which is always one way of finding out what’s available and where. Each search result also has a numbered result – if you type in that number it takes you to the actual menuconfig menu for that result.
From: Qingtao Liu ***@***.***>
Sent: 04 January 2023 08:39
To: apache/nuttx ***@***.***>
Cc: Subscribed ***@***.***>
Subject: Re: [apache/nuttx] May i get some help before starting porting NuttX to a new arch namely LoongArch (Issue #7566)
Hi, i`m trying to add some config items in Kconfig files. I notice that there is a $ARCH variable in ${TOPDIR}/Kconfig file. I think it may stand for host cpu arch. But i couldn`t find out where the definition is.
Here are the steps:
In ${TOPDIR}
./tools/configure.sh -l maix-bit:nsh
make menuconfig
As you can see, the mainmenu is "NuttX/x86_64 Configuration"
Thanks for your time~
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[GitHub] [nuttx] GooTal commented on issue #7566: May i get some help before starting porting NuttX to a new arch namely LoongArch
Posted by "GooTal (via GitHub)" <gi...@apache.org>.
GooTal commented on issue #7566:
URL: https://github.com/apache/nuttx/issues/7566#issuecomment-1427353532
Hey, i noticed that the aclint base for risc-v qemu is defined like this:
```
#define QEMU_RV_ACLINT_BASE 0x02f00000
```
I can`t find out the related specification, but only found this https://github.com/riscv/riscv-aclint/releases/download/v1.0-draft2/riscv-aclint-1.0-draft2.pdf. It seems this doc does not mentioned the aclint base addr 0x02f00000.
Can you provide some info about the related specification?
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