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On 9 Mar 2006, at 15:34, Michael Lorenz wrote:

> Hello,
>
>> My powerbook is quite slow too: the proc does not run as the desired
>> speed: dmesg says
>>
>> cpu0: 668.73 MHz, 512KB L2 cache
>>
>> when the cpu should run twice as fast...
>
> That's - sadly - quite normal. Apple used at least two different  
> ways to
> control CPU speed - by switching bus clock and by having the PMU
> manipulate the core clock frequency. I have a patch sitting around  
> which
> supports the former method on my iBook G4 ( early 2004, it doesn't  
> work
> on later models where the CPU runs at more than 800MHz ).
> The reason why this happens is that the firmware doesn't start up the
> CPU at full speed and NetBSD just uses what it finds.
>
> To fix this Someone(tm) will have to dig through the Darwin source,  
> find
> the part that controls CPU clock via PMU and then adapt our PMU code.

As Someone(tm) who's been spending a lot of time reading Darwin  
sources of late, I can tell you that starts in AppleMacRISC2PE; have  
a look at MacRISC2CPU.{h,cpp}; then have a look at iokit/Kernel/ 
IOPMrootDomain.cpp in xnu.

As Someone(tm) who doesn't really know NetBSD I've got no idea how  
you'd implement that (nor indeed whether the Darwin sources  
completely specify the appropriate code, I believe they do though).

Cheers,

Graham.

-- 
Graham Lee                       GPG Key ID: 01D5B9D8
UNIX Systems Manager,
Oxford Physics Practical Course
http://users.ox.ac.uk/~wadh1342               01865 273450



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