nios2 and openrisc in barebox

[Ahmad Fatoum]

Hello,

On 25.02.21 14:02, Jules Maselbas wrote:
> On Thu, Feb 25, 2021 at 09:45:00PM +0900, Stafford Horne wrote:
>> Hello,
>>
>> I am the maintainer of most OpenRISC things right now.  I would be happy to
>> help, but I don't really use barebox right now.  Most of my deployments I use
>> with litex FPGA SoC's that has its own bootloader.
>>
>> That said, we have a setjmp/longjmp implementation in our glibc port which I
>> have been testing for upstreaming lately.
>>
>>   https://github.com/stffrdhrn/or1k-glibc/blob/or1k-port-2/sysdeps/or1k/setjmp.S
>>   https://github.com/stffrdhrn/or1k-glibc/blob/or1k-port-2/sysdeps/or1k/__longjmp.S
>>
>> I had a look at the barebox docs and openrisc port, it seems like there is
>> support for our standard platform, or1ksim, which is the same as my de0-nano
>> fpga board/soc and qemu.  I should be able to make use of this.
>>
>> Is there a branch where you are doing the green thread work?  I could add and
>> test the OpenRISC implementation.
> Hi,
> 
> I've done this yesterday, I've push a branch[1] that has the green
> thread paches applied (except patches on usb mass storage gadget).
> https://github.com/jmaselbas/barebox/tree/test_setjmp 

Great. Thanks. I'm preparing an updated version that will clean it up
a bit, but the heart part of architectures providing setjmp/longjmp/initjmp
will stay the same.

Small request:
  If you implement initjmp, could you have it save into jmp_buf a frame
  pointer value of NULL if applicable? That way, should backtrace be
  implemented (or done via JTAG), they have a defined end.

Cheers,
Ahmad

> To test greenthread your can run the `poller -c` command in barebox's
> prompt. To do you you'll need to enable CONFIG_POLLER_YIELD and define
> CONFIG_HAS_ARCH_SJLJ
> 
> Best,
> Jules
>  
> 
> 
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