Marius Bakke <mba...@fastmail.com> skribis: > 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.
It might be that we no longer need QEMU 1.3.1 to run the tests (see the top of gnu/packages/grub.scm)? Ludo’.
