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From: Phillip Susi <psusi@cfl.rr.com>
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Subject: EFI disk IO
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IIRC, EFI provides filesystem IO support, so I was wondering: does
grub-efi use the EFI file IO calls, or does it still use its built in
partition and fs parsing modules, and only rely on EFI for the low level
disk block IO?

It seems like you would want to build the grub fs modules as EFI drivers
to extent the entire EFI system if needed, and rely on EFI for file IO.