So CONFIG_XEN_DISABLE_SERIAL probably needs turn on some intelligent
runtime probing of whether we are running on bare hardware or on Xen.
If the former, do nothing, if the latter, remove the serial devices
the list of available consoles. No?
Or you could try to figure out why that config option is needed
at all -- after all, it is not needed on JS20, which is quite
Garbage char output sounds like something is changing the baud
rate settings on the UART (or similar).
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