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

Ingo Molnar
2008-08-20T10:46:20Z

* Juergen Beisert <jbe@pengutronix.de> wrote:

> 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.

so, what's the recommendation - is the patch fine? (which removes
incrementor setting, leaving it to the BIOS)

Ingo