linux-kernel - Re: kernel won't boot on a Cyrix MediaGXm (Geode )

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Message-Id: <200808201144.02919.jbe@pengutronix.de>
Date:	Wed, 20 Aug 2008 11:44:02 +0200
From:	Juergen Beisert <jbe@...gutronix.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Samuel Sieb <samuel@...b.net>, linux-kernel@...r.kernel.org,
	"Rafael C. de Almeida" <almeidaraf@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus@...inux.co.jp>,
	takada <takada@....nifty.com>
Subject: Re: kernel won't boot on a Cyrix MediaGXm (Geode )

On Mittwoch, 20. August 2008, Ingo Molnar wrote:
> * Samuel Sieb <samuel@...b.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
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