Unfortunately to this day there is no documentation for bifury's chip. I started digging trough the forums and collecting various bits from here and putting the pieces together. I've put all of those notes in a wiki article - which uses the "docuwiki" format, and github wants the "mediawiki" format, so on my to-do list is to start reworking that. If there are any volunteers to help with that or know how to easily convert it - please PM me.