Justin C. Miller 40130076b2 [uart] Fix UART driver hangs ...

The UART driver would constantly hang in unpredictable spots. Turns out
it could get into a situation where it was stuck in a loop unable to
read more from the receive channel, and/or write to the serial port
buffer. Now we use a ring buffer to read as much as possible from the
receive channel, write as much as possible to the serial port buffer,
and move on without looping.

2024-03-04 19:48:16 -08:00

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