overclocking?

overclocking?

[Rees Boffey]

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in the cpufreq documenatation in my 2.4.21-benh kernel it mentions that arguments echoed to the /proc/cpufreq entry are first validated before any changes are made. my question is, is it possible to remove this validation to allow the overclocking of the cpu?
the ibook2.2 that i use is possible of being overclocked via software using an early version of the CHUD tools for osx but as of yet i have not found a way to do it under linux.
appreciate any replies/flames :)

rees.

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Re: overclocking?

[Benjamin Herrenschmidt]

On Sun, 2003-06-29 at 05:42, Rees Boffey wrote:
> in the cpufreq documenatation in my 2.4.21-benh kernel it mentions that
> arguments echoed to the /proc/cpufreq entry are first validated before any
> changes are made. my question is, is it possible to remove this validatio
> to allow the overclocking of the cpu?
> the ibook2.2 that i use is possible of being overclocked via software using
> an early version of the CHUD tools for osx but as of yet i have not found a
> way to do it under linux.
> appreciate any replies/flames :)

Well... some PowerMac models support only dual speeds (via PMU changing the
PLL strapping & resetting the CPU). Some others (the 750FX based iBooks)
could in theory be programmed to any speed supported by the PLL... Currently,
I do not have code to take advantage of this "feature". Those chips have 2
PLLs and can switch instantly between them. One is setup for full speed,
the other for "low speed" by the firmware, all I support via cpufreq so far
is to switch between those 2

Ben.