URL:
<https://savannah.gnu.org/bugs/?58300>
Summary: GRUB refuses to boot a 32-bit kernel when in EFI
mode
Project: GNU GRUB
Submitted by: hamishmb
Submitted on: Mon 04 May 2020 11:12:15 AM UTC
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: Software Error
Status: None
Privacy: Public
Assigned to: None
Originator Name: Hamish McIntyre-Bhatty
Originator Email: [email protected]
Open/Closed: Open
Release:
Release: 2.02
Discussion Lock: Any
Reproducibility: Every Time
Planned Release: None
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Details:
Note that this is with BIOS and UEFI images created from Ubuntu 18.04's
current version of GRUB (*2.02-2ubuntu8.15*). If it would be more useful for
me to submit for Ubuntu instead/as well then I'll do that.
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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