[generic-efi] Images using btrfs does not boot
A couple of small changes is needed to the default grub.cfg to be able to boot from btrfs, but even with rootflags=subvol=@
and rootfstype=btrfs
added, when we boot we still get:
error: sparse not found
error: extent not found
error: kernel image needs to be loaded first
As far as I can tell, the extent error point to errors on the btrfs filesystem it self, but it does not happen with other profiles. Only the EFI/GRUB based one.