2015-01-05, 16:01
I think the Hifiberry and lirc failures were initially due to the base DTBs not being updated - the module responsible for pinctrl has changed - and then doubly scuppered by the mkknlimg breakage. A clean build of top-of-tree rpi-3.18.y with the updated mkknlimg gets me a working Hifiberry Digi, and an lirc-rpi module that appears to do the right thing (I don't have an IR setup).