some question about serial.c

[Andy Green]

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Somebody in the thread at some point said:

| 2. config uart clock source as PCLK, 16Mhz,

Make sure you set the GPIO registers for these pins to be in peripheral
mode not GPIO.  See GPHCON.

There's also a peripheral clock mask register CLKCON, it says it resets
to all enabled though.

- -Andy
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