Comment # 4 on bug 1164310 from Fabian Vogt

(In reply to Guillaume GARDET from comment #3)
> (In reply to Fabian Vogt from comment #2)
> > Why is there a /boot partition? That breaks snapshotting.
> > 
> > It doesn't make sense to have /boot on ext4 and /boot/grub2/arm64-efi as
> > btrfs subvolume.
> 
> I think /boot was not a btrfs volume because u-boot had no support for
> btrfs, so far.
> Matthias enabled it very recently, so we should be able to merge /boot
> partition into the btrfs volume.

For EFI images the btrfs support in GRUB is used. That's how RPi images boot
already.