gimlet-seq-server: start driving fault pin. #1556
Merged
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This pulls the fault pin low (active) shortly after the sequencer task first runs, and then sets it high (inactive) only once we get up to the IPC loop.
Failures in the sequencer startup tend to cause panics, which will have the effect of holding the pin low as the task is repeatedly restarted. This also means we will be able to externally observe any other restart of the task.