Github has been updated with R1 of my SBC.
Since this actually turned out to be a complete rerouting of the whole board, I finally got rid of the - now unobtainium - PMS171b, and the firmware also got quite an overhaul I'm finishing up this project and moving on... To R1!
R1 will get it's own project on hackaday.io because they are simply too different - naming-wise I'll just call it R1 :)
Check out one of the upgrades here - as you see the board is quite different:
I'll post a final log here when R1 has it's own project page.