Grub relies on optional deprecated EFI handover protocol

[Jean-Alexandre Anglès d'Auriac]

On Ubuntu 22.10 Kinetic Kudu, using grub2 2.06-2ubuntu12.1, I can boot ArchLinux on kernel 6.1.12 and below, but when trying to boot on kernel 6.2 and above I get this error message:

erreur : le noyau ne prends pas en charge le transfert d'EFI
erreur : le noyau doit d'abord être chargé.

which translate roughly to

error : kernel doesn't support EFI transfer
error : kernel must but loaded first.

This is apparently linked to Ubuntu grub relying on a (now optional) deprecated EFI handover protocol, which isn't activated by default on ArchLinux, see :

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/x86/Kconfig?h=v6.2&id=cc3fdda2876e58a7e83e558ab51853cf106afb6a

https://bugs.archlinux.org/task/77632

The support for this deprecated EFI handover protocol is set to be entirely retired at a later date according to the kernel commit message, so I think it should not be a requirement for Ubuntu's version of Grub.

[Julian Andres Klode (juliank)]

As stated already in bug 2009242, all larger Linux distributions use the handover protocol and will continue to do for the foreseeable future.

Please check existing bugs before reporting bugs.