I'm trying to learn more and more about building the complete system. To that end I wired up a background debugger and I pulled the memory out of both the F1 (px4io) and the F4(px4fmu) processors into flat binary files. I then erased the processors, verified that nothing happened on power up, and then re-wrote out the flat images I stored. Everything still works, so sanity is established.
I then tried to write the px4io-v2.bin file that is created in the Arduplane build process out to the F1 processor and I get "Check BRD_TYPE px4io failed to start" I switched BRD_TYPE to '2' since that is what I was using before, rebooted, and still get the message. As soon as I put the binary I read off back everything is kosher.
As a note I was also able to program the fmu_bl.bin from deep in the directory structure into the F4 and use mission planned to load in the ArduPlane-v2.px4 file I built. So I think I have the F4 pretty well wired, what am I missing on px4io?