Good luck. My guess was just that: a guess. On machines with a BIOS, the MBR program is loaded into RAM and then executed. EFI machines are different, they emulate a BIOS when booted in legacy mode.
EFI booting and GPT support are both in active development. That may be a solution for your hardware, but not all the pieces of the puzzle are completely in place yet... and those that are in place now are subject to further operational revisions.
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