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

[Juergen Beisert]

On Mittwoch, 20. August 2008, Ingo Molnar wrote:
> * Samuel Sieb <samuel@xxxxxxxx> 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
 Pengutronix - Linux Solutions for Science and Industry
    Handelsregister: Amtsgericht Hildesheim, HRA 2686
         Vertretung Sued/Muenchen, Germany
   Phone: +49-8766-939 228 |  Fax: +49-5121-206917-9
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/