[Bug 538100] Re: Linux fails to read GPT(EFI) partition table created by both GNU parted and OSX diskutil

[Colin Watson]

It's not out of the question that this is actually a parted bug.  I
merged the Apple gptsync patch up to 2.2 more or less blindly, and I
could have broken something.

I think you're analysing this incorrectly, though.  What I'm seeing in
the kernel is that you need a valid *protective* MBR, as specified in
EFI.  The gptsync patch in parted is to deal with the fact that Apple
diverged from the GPT spec in requiring (approximately) a copy of the
first four GPT partitions in MBR-speak rather than a dummy protective
MBR whose only purpose is to say "hi, this is really GPT", so on Apple
systems (only), parted has to act differently.  A synced MBR is usually
also a valid protective MBR as far as the kernel is concerned, but only
if you have an EFI System Partition.

Therefore, I think the problem might well be that you haven't created an
EFI System Partition, only a random FAT partition.  Could you try this
modification to your recipe?

  mklabel gpt
  mkpart primary fat 0 50
  set 1 boot on
  quit

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Linux fails to read GPT(EFI) partition table created by both GNU parted and OSX diskutil
https://bugs.launchpad.net/bugs/538100
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