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Using different baud rates for the two otherwise compatible
applications risk confusing users of both applications. An espeicially
unlucky case is setting host side to 460800 while reading from a
board set to 921600 -- the stream will look random while it's actually
pretty bad.
Raising 'entropy' rather than lowering 'cc20rng' is motivated by the
fact that cc20rng saturates 460800 baud(*) with its ~75 kB/s output.
(*) 460800 baud should be 57.6 kB/s or 51.2 kB/s, depending on whether
or not the stop bit is counted towards the baud rate. I would suppose
it is.
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