After some fairly intense abuse, it appears I bricked the board, but it’s unclear. It’s stuck on the penguin default boot screen with an error that says:
hsi_thermal f7030700.tsensor: THERMAL ALARM: T > 50
of_dma_request_slave_channel: dma-names property of node ‘/smb/uart@f7113000’ missing or empty
Someone please confirm if there is a way around flashing it. Sadly I didn’t back anything up and all the work is sitting on the ROM. It would be even sadder if it was fried, but seems unlikely.
I had an iPhone 6S+ in one of the USB ports, and it was powered by a 12V @ 2A-ish power, with non-stop compiling, recompiling, Bluetooth / wifi radios both on and humming.
Looking around for the error on-line I see that it’s definitely temperature related. Hopefully there is an easy way to reset the board.