Comment # 9 on bug 1164310 from Fabian Vogt

(In reply to Guillaume GARDET from comment #8)
> (In reply to Fabian Vogt from comment #7)
> > (In reply to Guillaume GARDET from comment #6)
> > > The comment in JeOS is:
> > > "Map /boot as ext4 to make dtbs available to U-Boot"
> > > 
> > > For RPi, we need a FAT partition so that the firmware, dtb and u-boot can be
> > > loaded.
> > 
> > That's the VFAT EFI partition. /boot is on btrfs, at least for the SLE JeOS
> > and openSUSE JeOS should do the same.
> 
> Yes, it is the EFI partition where required files are copied automatically.
> 
> So far, openSUSE JeOS uses ext4, not btrfs. 

The EFI flavor, which is tested in openQA, uses btrfs.