Re: 2.6.27: 0 MHz CPU and wrong system time on AMD Geode system

From: Jordan Crouse
Date: Mon Oct 20 2008 - 16:23:38 EST

On 17/10/08 15:17 -0700, Alok Kataria wrote:
> On Thu, Oct 16, 2008 at 9:48 PM, Antipov Dmitry <dmantipov@xxxxxxxxx> wrote:
> > Jordan Crouse wrote:
> >
> >> Could you try a 2.6.26 kernel? That will confirm that this is a new
> >> addition to 2.6.27.
> >
> > Both 2.6.26 and looks good (with CONFIG_GEODE_MFGPT_TIMER=y).
> Can you try the attached debug patch, it puts a printk message and
> will let us know what exaclty is failing during the calibration
> process.
> There were some major changes in the 2.6.27 cycle related to tsc calibration.
> Apart from the unification for 32 and 64bit, some checks were added in
> the code to make the calibration process more robust, maybe this
> specific machine is more prone to SMI's than other, as a result the
> checks are a little to harsh for this one.
> Along with the dmesg with this patch, could you also let us know how
> much is the frequency that the (2.6.26) kernel calibrates and what the
> actual freuqency is on that box ?

I just booted with with high res timers on, and I can't recreate
on a generic Geode box. The only difference is that my system doesn't
have any MFGPT timers available, but that shouldn't matter if you have


Jordan Crouse
Systems Software Development Engineer
Advanced Micro Devices, Inc.

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