Hi:

Currently EFI executables don't include part_msdos or vfat support by default. This means that EFI executables can only be launched directly from ISO9660 filesystems. The attached patch explicitly adds part_msdos and vfat so that the rest of the GRUB files can be found on other devices, such as USB keys.

Thanks,

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Mario Limonciello
Linux Engineer
Dell | OS Engineering