[bug #63127] failure to correctly read BPB block in GPT/UEFI setting

[Milan Durovic]

Follow-up Comment #7, bug #63127 (project grub):

Ok, got it working! Mind you, I still don't understand which low level detail
was the stumbling block, or why it didn't work originally. The key help came
from this article:

https://blog.heckel.io/2017/05/28/creating-a-bios-gpt-and-uefi-gpt-grub-bootable-linux-system/

the part that describes how to install on EFI systems. The key difference is
that after the creation of FAT32 filesystem as EFI system partition, I
detached the loop device and then reattached it using the following:

LOOPDEV=$(sudo /usr/sbin/losetup --find --show ./uefi.img)
sudo /usr/sbin/partproble $LOOPDEV
sudo /bin/mount ${LOOPDEV}p1 /mnt

Now, when I copied files and ran grub-install (I ended up using
grub-mkstandalone, but still the same) GRUB started normally and I finally
ended up in the GRUB shell.


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