Re: NatSemi SC1200 timer problems

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 21 Mar 2002 16:50:46 +0000 (GMT)

> Alan, i think did a patch to disable the TSC on the MediaGX and I have
> seen posts by you where you say about the MediaGX that "It reports a
> TSC but the TSC is unreliable at least in certain strange
> circumstances". Do you refer to the TSC being stopped or turned off
> on halt or suspend or is it a completely different problem? Could you
> please tell me what kind of problems you saw?

On the 5510/5520 bugs in the timers prevent use getting the TSC/delay
calibrated. This works ok on the 5530. I also saw some really bizarre goings
on with the TSC on some devices like joystick.

The older kernels kill TSC on any MediaGX (but will miss newer geodes due
to the cpuid change). Current one will kill tsc on 5510/5520 and knows
the new geode idents

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