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svn:author
V 2
kp
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svn:date
V 27
2019-12-31T10:54:13.059068Z
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svn:log
V 189
sifive: uart driver

Implement support for the UART as found on the SiFive FU540. It should
also work on, but has not been tested with, the FU310.

Reviewed by:	philip
Sponsored by:	Axiado

END