iMac G5 cpufreq

Benjamin Herrenschmidt benh at
Wed Apr 13 09:12:19 EST 2005

On Tue, 2005-04-12 at 10:31 -0500, Olof Johansson wrote:
> On Tue, Apr 12, 2005 at 04:28:20PM +0200, Markus Demleitner wrote:
> > So: Could anyone give me a hint what would be required to do CPU
> > frequency scaling on G5s?  And is there any known documentation 
> > or source code out there that might be helpful in doing whatever is
> > required?
> The PPC970FX User Manual Chapter 9.8 describes how to use
> PowerTune. However, there are arguments needed to be passed in that I
> don't know where to find in the docs. Maybe Darwin has them somewhere?

I haven't yet implemented PowerTune support for 970FX yet indeed. It's
on my todo list. Darwin does has some bits, there are other bits I'll
have to figure out in more brutal ways (like the voltage control).


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