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Hello,

> > So far this in only known to work on my iBook. It may or may not
> > work on different hardware.
>=20
> It seems to have no effect on my iBook G4 of 1 GHz.  This is the
> output from "sysctl -w machdep.cpu_speed=3D0 && flops && sysctl -w
> machdep.cpu_speed=3D1 && flops":

So it got the frequency bit wrong.
Please check the child nodes of mac-io/gpio in your OF device tree,
there should be one named 'frequency-gpio'  - what's its address? On my
iBook G4 it's frequency-gpio@1a, on yours it's probably different.

have fun
Michael

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