I finally returned to futzing with my bricked Dockstars. Still receiving mostly garbage over the UART with occasional snippets of kernel output. So I try the self-test, and see…
... VPU(0.00) FAIL 3.3V(3.32) OK ADC(0.00) FAIL ... Bus Hi-Z 1 MOSI FAIL CLK FAIL MISO FAIL CS FAIL
Drat. Those last few failures seem relevant. MOSI/MISO are TX/RX for the UART. This was a SparkFun version I picked up using SparkFun’s yearly giveaway, not an original Bus Pirate. I might have to pick up a real one, maybe next month. Still want to use the low-power Dockstars for most server-ish tasks at home, particularly with the summer power bills.
Edit: Ok, I forgot to put the jumpers cross the voltage sources, so it makes sense that the above failed. So much for the easy answer. Back to poking at the UART sometime.