Re: nios2 and openrisc in barebox

[Stafford Horne <shorne@gmail.com>]

On Mon, Mar 01, 2021 at 12:05:35PM +0100, Ahmad Fatoum wrote:
> Hello,
> 
> On 25.02.21 16:33, Ahmad Fatoum wrote:
> 
> > 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.
> 
> Dismiss this last request. C code will just zero-initialize jmp_buf,
> so initjmp needs only fill out return address and stack pointer. I just
> sent out a series, which can be used to develop this one.

Thanks,

I will start looking at this now, I'll let you know when I get progress on
openrisc.

> @Jules, any chance you could take over the kvx port? :-)
> 
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