Public bug reported:
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?
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
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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https://bugs.launchpad.net/bugs/1876737
Title:
GRUB refuses to boot a 32-bit kernel when in EFI mode
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