Feature request, add Kernel flag LOAD_X64_ON_IA32_ENABLE

[lorn10]

Hi!

Here follows a feature request. Please build upcoming kernels with the flag LOAD_X64_ON_IA32_ENABLE. Thanks to this new feature it is possible to boot a Linux kernel also on mixed mode EFI systems. So the kernel will be able to boot directly (through EFISTUB) on a 32bit EFI system which contains a 64bit CPU.

Such mixed 32bit/64bit situations exists for example on several early 64bit Intel Atom Netbooks and also at the first Apple Intel based computers.

It seems that this principle doesn't work with GRUB. But the Linux kernel EFISTUB booting is working absolutely great in conjunction with the awesome rEFInd boot loader. Whatever, please also check if there could be added an *.efi extension to the kernel name. So for the current LTS kernel this will be "vmlinuz-5.4.0-70-generic.efi" instead of just "vmlinuz-5.4.0-70-generic". This will allow to select automatically the most current kernel in the rEFInd or Apple Stock EFI boot loader. Otherwise, without the *.efi name extension, the kernel doesn't shows up, the kernel is not recognized and cannot be selected. This may be a limitation of the Apple EFI implementation.

Thanks!

C. Leu

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.4.0-70-generic 5.4.0-70.78~18.04.1
ProcVersionSignature: Ubuntu 5.4.0-70.78~18.04.1-generic 5.4.94
Uname: Linux 5.4.0-70-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Apr 8 11:01:33 2021
InstallationDate: Installed on 2021-04-07 (0 days ago)
InstallationMedia: Kubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: linux-signed-hwe-5.4
UpgradeStatus: No upgrade log present (probably fresh install)