On Thu, Oct 16, 2008 at 9:48 PM, Antipov Dmitry 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 2.6.26.6 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 ?

Thanks,
Alok
>
> Dmitry
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>

On Fri, Oct 17, 2008 at 03:17:39PM -0700, Alok Kataria wrote:
> 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.

I recently had to disable the timer generating an SMI on our platform,
because it would cause FIFO overflows on serial ports and other
infrequent problems. SMM/SMI is just a pain in the rear.

I haven't tried 2.6.27 yet, but have not had issues with 2.6.26 so far
(other than it seemingly breaking the SC1200's ide controller with
certain compact flash cards which I am still trying to track down, but
that isn't a Geode LX problem, that's a Geode SC1200 problem).

--
Len Sorensen
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

On 17/10/08 15:17 -0700, Alok Kataria wrote:
> On Thu, Oct 16, 2008 at 9:48 PM, Antipov Dmitry 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 2.6.26.6 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 2.6.27.1 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
CONFIG_GEODE_MFGPT_TIMER turned off.

Jordan

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/