On Tue, Apr 1, 2025 at 12:36 PM Vladimir 'phcoder' Serbinenko
<phco...@gmail.com> wrote:
>
>
>
> Le jeu. 27 mars 2025, 23:44, Alec Brown <alec.r.br...@oracle.com> a écrit :
>>
>> On Wed, Mar 26, 2025 at 5:43 AM, Vladimir 'phcoder' Serbinenko
>> <phco...@gmail.com> wrote:
>> >>
>> >>
>> >>
>> >> +#ifdef GRUB_MACHINE_EFI
>> >> +#include <grub/efi/efi.h>
>> >> +#include <grub/efi/disk.h>
>> >> +#include <grub/efi/pe32.h>
>> >> +#endif
>> >> +
>> >>
>> > Can UKI work without EFI? I think of scenario of putting e.g. EFI disk into
>> > coreboot or BIOS machine.
>>
>> No UKI only works EFI systems.
>
>
> Can GRUB parse image and get kernel and initrd out of it and load like Linux?
> What prevents add doing so. This is not a problem for this patch per se but I
> want to understand
I hacked that together for my own tests a while back and was able to boot a UKI
using the contained linux, initrd, cmdline in BIOS mode.
>>
>>
>> >>
>> > What's the purpose of fallback? It's not what user/script has requested. It
>> > needs to be at very least disableable
>>
>> The fallback code was from some of the old blscfg code I was working with and
>> I added the UKI default directory. I'll add an option in case the user wants
>> this behavior.
>>
>> >
>> >>
>> >>
>> >> + }
>> >> + else if (cmd_type == GRUB_UKI_CMD)
>> >> + {
>> >> +#ifdef GRUB_MACHINE_EFI
>> >> + grub_efi_loaded_image_t *image;
>> >> + image = grub_efi_get_loaded_image (grub_efi_image_handle);
>> >> + devid = grub_efidisk_get_device_name (image->device_handle);
>> >> +#endif
>> >>
>> > This uses grub image location. What about a scenario when booted from
>> > external drive and I want to boot into install on primary disk?
>>
>> Maybe I might not understand this scenario very well, but would it be better
>> to load the UKI directory using the "--path" option? This bit of code is
>> trying to locate the EFI system partition of the default directory. I'm not
>> entirely sure the best way to find the default directory if it were to be on
>> a different drive.
>
> Does --path disable default path scanning?
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