Kevin O'Connor 56004c0228 mcu: Don't default serial config option to /dev/ttyS0 ...

If the mcu config section is omitted, it leads to confusing error
messages.  Don't default the serial config option to /dev/ttyS0 to
improve the error reporting.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

2020-10-28 15:35:08 -04:00

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