Bug#1108898: riscv64: Illegal instruction appears when using rdcycle in grub

[Bo YU]

Control: tags -1 patch

Hi,

On Mon, Jul 07, 2025 at 05:43:03PM +0800, Han Gao wrote:
[...]
>
>Dear Maintainer,
>
>Illegal instructions will occur when debian riscv64 iso boots to grub.efi.
>
>Because grub uses the rdcycle instruction.
>
>Upstream[1] has fixed this issue and hopes to backport to 2.12.
>
>[1]: https://cgit.git.savannah.gnu.org/cgit/grub.git/commit/grub-core/kern/riscv/efi/init.c?id=c5ae124e11f28f637cbd38cb4d6c1b9817baa135

I just backport the commit to generate one debdiff in order to facilitate
maintainer to review this(hopefully) and built it on riscv64 also.

-- 
Regards,
--
   Bo YU

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