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The nominal partition type for EFI boot partitions is FAT32, which has a minimum size of 32MiB on a 512-byte-sector block device. To ensure that the boot partition is created as FAT32 set a size well above this minimum. A useful discussion about EFI partition sizes can be found here: https://superuser.com/questions/1310927/what-is-the-absolute-minimum-size-a-uefi-system-partition-can-be I have found 128MiB works pretty consistently across both tools (mkfs.fat) and firmwares (EDKII) Signed-off-by: Mathew McBride <matt@traverse.com.au>