From: Juergen Beisert <jbe@pengutronix.de>
Organization: Pengutronix - Linux Solutions for Science and Industry
To: Ingo Molnar <mingo@elte.hu>
Date: Wed, 20 Aug 2008 11:44:02 +0200
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Cc: Samuel Sieb <samuel@sieb.net>, linux-kernel@vger.kernel.org,
       "Rafael C. de Almeida" <almeidaraf@gmail.com>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Magnus Damm <magnus@valinux.co.jp>, takada <takada@mbf.nifty.com>
References: <48841A92.4020301@sieb.net> <489A82D5.6020903@sieb.net> <20080820093238.GA22511@elte.hu>
In-Reply-To: <20080820093238.GA22511@elte.hu>
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Message-Id: <200808201144.02919.jbe@pengutronix.de>
Subject: Re: kernel won't boot on a Cyrix MediaGXm (Geode )
Sender: linux-kernel-owner@vger.kernel.org
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On Mittwoch, 20. August 2008, Ingo Molnar wrote:
> * Samuel Sieb <samuel@sieb.net> wrote:
> > Ingo Molnar wrote:
> >> any patch we should pick up to make your box boot?
> >
> > I've looked through various datasheets and found that the GXm and GXLV
> > Geode processors don't have an incrementor.  I attached two patches. One
> > only calls the incrementor setup for GX1 or better.  The other one
> > removes the incrementor setup entirely.  As the incrementor value
> > differs according to clock speed and we would hope that the BIOS
> > configures it correctly, it is probably the better one to choose.  But I
> > will leave that choice up to you.  Either one works for me. :-)
>
> i went for the commit below and queued it up in tip/x86/urgent - thanks
> Samuel.
>
> what happens if the incrementor is not set up correctly by the BIOS

The system can freeze. The clock the incrementor modifies is used for the 
external SDRAM (something like a delay line or jitter reduction). Thats why 
its setting depends on the core clock speed.

Juergen
-- 
Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
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