[Buildroot] [PATCH v2 1/2] boot/grub2: add RISC-V 64bit EFI support

[Yann E. MORIN]

Julien, All,

On 2023-12-29 16:47 +0100, Julien Olivain spake thusly:
> On 24/12/2023 17:58, Yann E. MORIN wrote:
> > On 2023-12-23 22:29 +0100, Julien Olivain spake thusly:
> > > Grub can be built as a RISC-V UEFI application since commit [1]. This
> > > commit was first included in grub version 2.04.
> > Oh, I forgot to add: it would be awesome if you coulde extend the
> > existing runtiem test to include a risc-v test:
> >     support/testing/tests/boot/test_grub.py
> In fact, I already had a test ready. I didn't send it because
> the current Buildroot docker image does not include qemu with
> RISC-V system emulation. See [1]. I sent a patch, accepted in
> commit [2] to enable this support, but the image was not regenerated
> since then.

Hm... I also have a pending series about reorganising the docker images:
    https://patchwork.ozlabs.org/project/buildroot/list/?series=386976

I did not include a bump of the image yet, to not make it too complex a
series, but the goal was to indeed update to a more recent base image,
like bookworm.

> Moreover, this RISCV 64bit EFI boot requires qemu >= 8.0.0.
> Buildroot docker image is still on Debian 11 bullseye, which
> includes qemu 5.2.0. Debian 12.4 bookworm only includes qemu 7.2.0,
> see [3].

Bullseye backports only has 7.2, but Bookworm backports has 8.1.2:
    https://packages.debian.org/bookworm-backports/qemu-system-misc

So, if we bump to bookworm, we could get a more recent qemu.

An alternative would be to switch to another distro that is more up to
date, like Fedora (39 has qemu 8.1.3) or Ubuntu (23.10 has qemu 8.0.4).

> Do you think in that specific case I could include add
> BR2_PACKAGE_HOST_QEMU=y in this specific runtime test config?

I would not care, but I think the runtime test infra can not use the
qemu from the build; it only uses the qemu from the system AFAICS; see
support/testing/infra/emulator.py at 39.

So, for now, it means we can't have a runtime test for EIF grub2 on
riscv64.

> > Also, it would be nice to extend the readme for grub:
> >     boot/grub2/readme.txt
> I added that to my task list!

Wee! :-)

Regards,
Yann E. MORIN.

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