A bad checksum caused by erased/changed code would probably result in watchdog/cop resets. The PRU chip will send a system reset (same as toggling the key on and off) if the COP expires. In this case, monitoring the ALDL stream should give a clue to this. Messages would be sent followed by a pause while the system does a cold reset. The ESide will reset the TSide in case where the E PRU COP times out.
A bricked unit can be restored without much trouble. There is no need to replace the chips using bootstrap to reprogram.
-Tom
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