halton: Halton Huo

BFU is used to update all ON bits, both kernel and userland. It is capable of updating some configuration files and is aware of the impact of the changes that have been made to ON. BFU is more thorough than Install, and takes longer. Also, unlike Install, the new kernel will be installed over the existing one, so if it does not work properly you may have to boot from alternate media to recover.

Here is a quick Guide of BFU,
http://www.enderunix.org/opensolaris/docs/building_opensolaris.txt