bugGNU GRUB - Bugs: bug #58300, GRUB refuses to boot a 32-bit...


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bug #58300: GRUB refuses to boot a 32-bit kernel when in EFI mode

Submitter:  Hamish McIntyre-Bhatty <hamishmb>
Submitted:  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
Open/Closed:  Open Release:  2.02
Release:  Reproducibility:  Every Time
Planned Release:  None

Mon 04 May 2020 02:07:34 PM UTC, comment #2: 
Hamish McIntyre-Bhatty <hamishmb>
Mon 04 May 2020 01:01:58 PM UTC, comment #1: 

NOTE: Doesn't seem to happen with grub 2.04 as found in Debian Bullseye, so this might be an Ubuntu problem.

Hamish McIntyre-Bhatty <hamishmb>
Mon 04 May 2020 11:12:15 AM UTC, original submission:  

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?

Hamish McIntyre-Bhatty <hamishmb>


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