main clock frequency

[Björn König]

So this is my patch.

It would be interesting for me to know the effective main clock values for
10.0 Hz and 16.0 Hz oscillators. My board uses a 18.432 Hz oscillator.

Currently I'm working on changing the PCK and MCK on-the-fly via sysctl
MIB which basically works well for me.

Björn
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