nios2 and openrisc in barebox

Ahmad Fatoum a.fatoum at
Thu Feb 25 10:33:06 EST 2021


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.
>> 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).

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.


> 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
> Best,
> Jules
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