Re: Is there a way to get the architecture of the machine just booted up by GRUB2: [32|64]-[amd|arm]? ...

[Narcis Garcia]

OKAY, thank you SteveSi:

'cpuid' command returns exitcode 1 or exitcode 0 depending on CPU 
features: 64-bit and/or PAE.

grub> cpuid -l
grub> echo $?
1

help:
grub> cpuid -h

Then I suppose this can be used at grub.cfg script to select appropriate 
OS kernel (maybe only in Intel-compatible hardware).


El 18/12/23 a les 11:43, SteveSi ha escrit:
> try  cpuid    ???
>
>
>
> On Mon, 18 Dec 2023 at 09:30, Narcis Garcia <narcisgarcia@gilug.org 
> <mailto:narcisgarcia@gilug.org>> wrote:
>
>     grub> cpu -l
>     error: can't find command `cpu'.
>
>
>     El 17/12/23 a les 16:22, SteveSi ha escrit:
>      > Use cpu -l command to detect 64bit CPU
>      >
>      >
>      > On Sun, 17 Dec 2023, 15:01 Narcis Garcia, <narcisgarcia@gilug.org
>     <mailto:narcisgarcia@gilug.org>
>      > <mailto:narcisgarcia@gilug.org <mailto:narcisgarcia@gilug.org>>>
>     wrote:
>      >
>      >     El 17/12/23 a les 15:18, Pascal Hambourg ha escrit:
>      >      > On 17/12/2023 at 12:08, Albretch Mueller wrote:
>      >      >>
>      >      >>   Say I burn a DVD with the debian bootable iso (the live
>     DVD) for
>      >      >> amd64, arm64 and 64-bit risc-v processors
>      >      >
>      >      > Debian does not provide any such multi-arch ISO image. Until
>      >     bookworm it
>      >      > provided a amd64+i386 multi-arch image which was able to boot
>      >     with PC
>      >      > BIOS (with ISOLinux, 32-bit x86 UEFI and 64-bit x86 UEFI
>     (with GRUB).
>      >      >
>      >      >> will GRUB2 automatically
>      >      >> detect the architecture and pick the file?
>      >      >
>      >      > Let's assume you you create such an ISO image for UEFI
>     boot only. It
>      >      > must contain an EFI partition with EFI images for each
>     firmware
>      >      > architecture : bootarm64.efi (built for ARM64), bootx64.efi
>      >     (built for
>      >      > AMD64/x86_64) and bootriscv64.efi (built for RISC-V64).
>     The UEFI
>      >      > firmware will seek the matching EFI image, and the GRUB
>     image will
>      >      > report the architecture in $grub_cpu and $grub_platform.
>      >      >
>      >
>      >     What about selecting between vmlinuz-...-amd64 and
>     vmlinuz-...-i386 on
>      >     non EFI firmware?
>      >
>      >
>      >     --
>      >     Narcis Garcia
>      >
>
>     -- 
>     Narcis Garcia

--
Narcis Garcia