As I said in the PM, place to start is
https://archlinuxarm.org/forum/viewtopic.php?f=48&t=12623&p=57935.
Start from the Beagle Bone Black Image, create the SD card, then modify so:
a) it works on the PB
b) it brings up the ethernet/seriel on the USB OTG interface
a) needs you to compile a recent uboot, so easiest done on an armv7 board, but build is (or was) simple (uboot has moved onto device trees, don't know how that changes the build).
for b) just follow the instructions on the above thread. Read carefully, and understand what each is doing, and why.
Anyway after that, just put the SD card in the PB, and plug into USB port on your computer, and then ssh into the box and you are away.