Kévin Redon e2b0f971e5 set main clock for using UART at 921600 bps ...

UART baud rate is main clock (MCK) divided by CR*16.
The MCK values are chosen >= 48 MHz and <= 64 MHz to have a near
integer value CR for a baud rate of 921600 bps.
The end MCK frequency between simtrace and qmod differ slightly
but are close to 58 MHz.

Change-Id: Iaa4a97fc68494c93b9d128503515d88049de506c

2018-08-28 19:13:13 +02:00

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