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SubjectChanging CPU Speed while running Linux
Hi there,

on my Elan410 based System it is very easy to change the CPU clock speed by
means od two outb commands.

I was wondering, if it does some harm to the Kernel if the CPU is
reprogrammed using a different CPU clock speed, while the system is up and

If so, is there a possibility to tell the Kernel that the clock speed has
been changed by means of a particular Kernel call?

If not, where would I put some code to do this at system boot?

Is /usr/src/linux/arch/i386/boot/setup.S the right place for something like

Thanks for hints


Sven Geggus @ Fraunhofer IITB, Karlsruhe (
Phone: +49 721 6091-422, Fax: +49 721 6091-213
Linux powered DATA aquisition and evaluation, embedded systems,
combustion engine diagnosis
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