Re: [Gumstix-users] Methods for lowering power consumption

[Michael K. <mfk...@gm...>]

Yuvraj,

On Nov 18, 2007 3:35 PM, Yuvraj Agarwal <yu...@uc...> wrote:
> I have a connex 200-xm and I would also like to enable CPU/frequency
> scaling. Have you been able to
> modify the CPU frequency manually and actually measure the power consumption
> change? What are the commands you
> use to do this? I'd also like to clock down my connex to 100Mhz. (my current
> build is version 1513
> on a connex-200xm).

There is a sysfs interface to control the CPU frequency from
user-space. You will find the interface at:

/sys/devices/system/cpu/cpu0/cpufreq

For details on controlling the frequency, see the file
Documentation/cpu-freq/user-guide.txt in the Linux kernel source tree.

I don't think you can control the CPU voltage on the gumstix boards...

--Mike