On Tue, Apr 1, 2025 at 6:35 AM, 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
If we aren't utilizing the EFI stub in the UKI, we could parse the kernel and
initrd from the section data and load it from there. In that case, I suppose
it would be possible to load it for a coreboot or BIOS machine.
>
>>
>> >>
>> > 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?
In this version, it does not. But in the newest version, I've added an option
to enable or disable a fallback that would scan for the default path.
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