[Bug 1876737] Re: GRUB refuses to boot a 32-bit kernel when in EFI mode
Julian Andres Klode
1876737 at bugs.launchpad.net
Thu Aug 13 08:56:54 UTC 2020
FWIW, to address some comments:
> This problem is Ubuntu-specific
It's not. It comes from
https://github.com/rhboot/grub2/commit/1c88c700148acf02863a350055a43eb87e16bbe5
- which adds support for loading 64-bit kernels on 32-bit UEFIs.
> For now, as a workaround, we're using bionic's grub, for example:
https://github.com/alkisg/ltsp5-uefi/blob/master/ltsp5-uefi#L49
Why not use a 64-bit kernel? Should be a much better option.
> This bug stops Android-x86 32 bits systems from booting in 64 bits
machines.
You can't boot them via Ubuntu's grub true, but then they probably have
their own bootloader?
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https://bugs.launchpad.net/bugs/1876737
Title:
GRUB refuses to boot a 32-bit kernel when in EFI mode
Status in grub2 package in Ubuntu:
Triaged
Bug description:
Also reported at https://savannah.gnu.org/bugs/index.php?58300, but
doesn't occur in Debian's v2.04 from Bulleye, and only occurred in the
last few months, so it might be an Ubuntu bug.
This is grub version 2.02-2ubuntu8.15 as reported by "apt show grub-
efi"
GRUB2 fails to boot a 32-bit kernel when started in EFI mode (64-bit
EFI) on a 64-bit x86 CPU, and gives the message:
"error: kernel doesn't support 64-bit CPUs"
However, when a bios grub image made by the same version of grub is
used, with the same kernel, on the same CPU, everything is normal and
the kernel boots as expected.
Hence, I know this kernel will boot on a 64-bit CPU, and with a
previous version of GRUB 2 (unfortunately I don't know which version),
it also booted fine in 64-bit mode using GRUB-EFI.
Running with debug=all doesn't seem to provide any extra useful
information, as far as I can tell - it just lists sectors being read
and then freed.
Any ideas as to what's going on?
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