Clearer message when exiting prematurely
Bump storage for MMC devices from 2 to 4.
I'm experimenting to try to figure out why ubldr only
seems to ever get the first MMC device from U-Boot.
Merge https://github.com/kientzle/crochet-freebsd

Conflicts:
	crochet.sh
Merge branch 'master' of https://github.com/teverett/crochet-freebsd