Removing the release-stopper keyword as I don't have access to any systems 
which require firmware to be able to boot. It's a feature request but not a 
release-stopper for me.

JFTR: when using initramfs-tools providing udev this feature should be 
available OOTB, but as long as we have the /linuxrc-style initrd the feature 
can't be implemented that easy without having access to such a system requiring 
firmware loading.