Ludovic Courtès <l...@gnu.org> writes: > Hi Marius, > > Marius Bakke <mba...@fastmail.com> skribis: > >> Ludovic Courtès <l...@gnu.org> writes: >> >>>> Relatedly, I think the way to build a 'multi-grub' is to have one >>>> expression for each supported grub platform, and then consolidate >>>> out/lib/grub from each. >>> >>> So in essence, GRUB itself supports only one platform at a time? >> >> AFAICT yes. Gentoo works around this by running the build for each >> user-specified platform and combining the outputs. Most other distros >> just carry separate grub-pc and grub-efi packages. >> >>>>> Now there are things I didn’t quite get. Apparently you’re supposed to >>>>> have a /boot/efi as a vfat partition, and ‘grub-install’ is supposed to >>>>> detect it and install the EFI stuff, or so I thought (info "(grub) >>>>> Installing GRUB using grub-install"). >>>>> >>>>> However, ‘grub-install’ still seems to be installing for “i386-pc” >>>>> instead of EFI. >>>>> >>>>> What am I missing? >>>> >>>> IIRC grub-install will detect and install for the running mode (pc, efi, >>>> etc). So in a classic chicken-and-egg situation, you need to be booted >>>> with UEFI mode for grub to select the correct installation platform! >>> >>> My understanding is that it would install for UEFI if it fines >>> /boot/efi or if --efi-directory is passed. >> >> I'm not so sure, but it's been a while since I played around with this. >> At least building the 'gnu/system/install.scm' image works fine when >> passing --efi-directory (see the bottom two patches from >> https://lists.gnu.org/archive/html/guix-devel/2016-12/txtchTym4QVKr.txt ), >> and I think it would choose i386-pc even if x86_64-efi was available >> since the VM boots in BIOS mode. >> >> Tangentially, I'm not aware of any way to build a "hybrid" ISO image >> using only grub. I've started work on packaging syslinux/isolinux which >> is what Debian uses for their hybrid UEFI/BIOS install image. > > OK. > > Having checked GRUB’s configure.ac etc., I realize that my suggestion of > having one ‘grub’ package doing both EFI and “PC” cannot work. What you > suggested initially (a separate ‘grub-efi’ package) is the only thing we > can do (we could perhaps merge the lib/grub directories as you > suggested, but it’s not even clear that this would work.) > > Thus, I think we need to revert 3eee16130d858ae96510ec1c7d38d31290de2699 > and install your initial ‘grub-efi’ patch. How does that sound?
OK. I'll try to find out why tests don't work with the UEFI variant first in order to at least write a meaningful comment. Maybe qemu needs UEFI support or something like that.
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