Do an explicit 'clean' when rebuilding ubldr.
Rework the uboot utility functions to accept the
base directory for the U-Boot source as a first argument.
This will allow me to play games with having multiple U-Boot
source directories.
Merge branch 'master' of github.com:kientzle/freebsd-beaglebone
First cut at dual-boot Proof-of-Concept.