oxidecomputer / oxidecomputer/hubris
`monorail` can crash loop if it cannot initialize the VSC7448
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Description
The monorail task on Sidecar (rev A) is failing to start up, with
15 monorail 67734488 6 FAULT: panicked at 'Could not initialize chip: BadChipId(4294967295)', task\monorail-server\src\main.rs:54:13 (was: ready)
This error is due to the VSC7448 itself reporting a bad chip ID; in this case, all ones.
We've seen this before (Matrix) when the clock generator was removed.
That's not the case here; we believe the board to be unmodified.
Next steps would probably be asking @ericaasen to probe power and clocks on the VSC7448.
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