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Load Unified Kernel Image (UKI) files into the GRUB menu. Boot entries
generated from uki won’t interfere with entries from grub.cfg appearing in the
GRUB menu. Also, entries generated from uki exists only in memory and don’t
update grub.cfg.
By default, the UKI files are stored in the /EFI/Linux directory in the EFI system partition. If UKI files are stored elsewhere, the --path option can be used to check a different directory instead of the default location. If no UKI files are found while using the --path option, the --enable-fallback option can be used to check for files in the default location.
The --show-default option allows the default boot entry to be added to the GRUB menu from the UKI files.
The --show-non-default option allows non-default boot entries to be added to the GRUB menu from the UKI files.
The --entry option allows specific boot entries to be added to the GRUB menu from the UKI files.
The --entry, --show-default, and --show-non-default options are used to filter which UKI files are added to the GRUB menu. If none are used, all files in the default location or the location specified by --path will be added to the GRUB menu.
For more information on UKI, see: The Unified Kernel Image Specification