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Date: Sun, 06 Nov 2016 16:07:52 +0100
From: Harry Schmalzbauer <freebsd@omnilan.de>
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Subject: boot1.efifat's FAT12 volume label prevents booting (some systems)
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 Recently I played with bsdinstall and UEFI setup, which left the system
unbootable (11.0-Release).
The culprit is the MS-DOS volume lable "EFI        " of the EFI partition.
At least on Intel Single-Socket Servers (for Xeon E3 IvyBridge/BearToot
+ Haswell/RainbowPass), the UEFI firmware can't handle the identical
path/volumelabel.

Simply reformatting with a different volume label (EFIFAT e.g.) solves
that problem!
Shall I file a bug report?

Btw, can someone explain in short words why BOOT64.EFI seems to be
boot1.efi, but padded with 0x20 up to 128k?

Thanks,

-Harry