Re: Help wanted improving Rust support for RISC-V

On Sat, Nov 16, 2024, 2:21 AM Tom Jones <thj@freebsd.org> wrote:

>
>
> On Fri, Nov 15, 2024, at 23:47, Alan Somers wrote:
> > I want to improve the state of Rust on FreeBSD in general, and RISC-V
> > in particular.  My plan is:
> >
> > * Assemble a corpus of crates heavy on OS stuff (like Nix and Tokio)
> > and ensure that their tests pass on Riscv FreeBSD.
> > * Update libc's ABI to FreeBSD 12, finally eliminating the need for
> > COMPAT_11 on riscv to run Rust programs.
> > * Ensure that the corpus of crates still passes their tests.
> > * Convince the libc maintainers to use the FreeBSD 12 ABI, for riscv
> only.
> > * After a full Rust release cycle (at least 6 weeks), and maybe two,
> > if there are no reports of breakage, and if Poudriere looks good, use
> > that as justification to raise libc's ABI for all architectures.
> >
> > But in order to do any of this, I need access to riscv hardware.  A
> > virtual instance at Scaleway[^1][^2] would be ideal, but I don't know
> > if FreeBSD can run there.  Has anybody tried it?  Failing that, I
> > would need to either acquire some hardware myself, or borrow access to
> > somebody else's.  Or, convince some other developer to do the work
> > himself.  But I won't be able to help very much if I don't have direct
> > access.
> >
> > Can anybody on this list help me get some access?
>
> I can’t help with scaleway, it sounds like an interesting choice.
>
> I have no idea of the current state of easily and affordable available
> hardware. The visonfive 2 might be a good choice, there has been a lot of
> work in the year since I last tried it.
>
> https://adventurist.me/posts/00315
>
> It’s probably still the easiest to get hold of if a little underwhelming.
>
> You don’t mention qemu, is there some reason you can’t start there?
>
> - Tom
>

I haven't had good luck with using qemu-user-static to emulate armv7.

>