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

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Message-ID: <20081020202357.GF22851@csclub.uwaterloo.ca>
Date:	Mon, 20 Oct 2008 16:23:57 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Alok Kataria <alokkataria1@...il.com>
Cc:	Antipov Dmitry <dmantipov@...dex.ru>, linux-kernel@...r.kernel.org,
	Jordan Crouse <jordan.crouse@....com>, akataria@...are.com
Subject: Re: 2.6.27: 0 MHz CPU and wrong system time on AMD Geode system

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
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