A huge thank you to whoever it was at makerbot who left the debugging symbols in libmachine; this is going to make my dumb project much easier!
Well, at least the PRU is initializing and I can hear the steppers jump. Which is nice. It's never returning from the buffer clear call, which is concerning. That concludes today's half hour hacking window; time to pick up the kids.
@th it's the AM1808, which we selected in 2010, before the AM335x were out, so earlier PRU rev but pretty much the same. At that time it was a sensible choice; nowadays not so much. Still cheaper than a FPGA, and while steppers need hard realtime they don't really need high speed.