Bug#1053803: debian-installer: grub2 2.12~rc1-10 on ARM64 daily installer makes linux image load fail

[Emanuele Rocca <ema@debian.org>]

Control: reassign -1 grub-efi-arm64-bin
Control: retitle -1 grub 2.12~rc1-10 fails loading linux on Renesas RZG2L, grub 2.06 works

Hi John, thanks for the bug report!

On 2023-10-11 04:15, John wrote:
> The ARM64 daily installer stopped working from 19-Sep-2023 due to grub2
> 2.12~rc1-10 updates with linux image load failure.
> 
> This was working ok on 04-Sep-2023 with grub 2.06-13

For now we've only been able to reproduce this on a Renesas RZG2L board
as far as I'm aware, retitling the bug accordingly. For example, I can
boot kernels with grub 2.12 on ARM systems such as the Thinkpad X13s,
Macbook M1, and RPi 3B+.

Also the problem is grub-specific and not limited to the installer, so
I've reassigned it to the grub-efi-arm64-bin binary package.

Booting with debug enabled, this is the output of a failed attempt on
the Renesas board. The grub version used in this test was 2.12~rc1-10.

		loader/efi/linux.c:101:linux: UEFI stub kernel:
		loader/efi/linux.c:102:linux: PE/COFF header @ 00000040
		loader/efi/linux.c:128:linux: LoadFile2 initrd loading enabled
		loader/efi/linux.c:495:linux: kernel file size: 34445248
		loader/efi/linux.c:497:linux: kernel numpages: 8410
		loader/efi/linux.c:514:linux: kernel @ 0xb6b43000
		loader/efi/linux.c:416:linux: Using LoadFile2 initrd loading protocol
		loader/efi/peimage.c:242:linux: PE-COFF header checked
		loader/efi/peimage.c:316:linux: sections loaded
		loader/efi/peimage.c:518:linux: no relocations
		loader/efi/linux.c:213:linux: linux command line: 'BOOT_IMAGE=/linux'
		error: image not loaded.

This instead is grub 2.12~rc1-11 succeeding on a RPi:

		loader/efi/linux.c:101:linux: UEFI stub kernel:
		loader/efi/linux.c:102:linux: PE/COFF header @ 00000040
		loader/efi/linux.c:128:linux: LoadFile2 initrd loading enabled
		loader/efi/linux.c:495:linux: kernel file size: 34510784
		loader/efi/linux.c:497:linux: kernel numpages: 8426
		loader/efi/linux.c:514:linux: kernel @ 0x2c920000
		loader/efi/linux.c:416:linux: Using LoadFile2 initrd loading protocol
		loader/efi/peimage.c:200:linux: PE-COFF header checked
		loader/efi/peimage.c:276:linux: sections loaded
		loader/efi/peimage.c:478:linux: no relocations
		loader/efi/linux.c:213:linux: linux command line: 'BOOT_IMAGE=/install.amd64/vmlinuz --- quiet'
        loader/efi/linux.c:233:linux: starting image 0x351cf518