Re: New powerbooks support status

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Fri, 2005-02-25 at 11:34 +0100, Antonio-M. Corbi Bellot wrote:
> El vie, 25-02-2005 a las 15:22 +1100, Benjamin Herrenschmidt escribió:
> 
> Hi BenH!
> 
> > Wht do you mean ? The half bogomips ? well, it might just be a matter of
> > enabling support for your machine in arch/ppc/platforms/pmac_cpufreq.c
> > around those lines:
> > 
> >         if (machine_is_compatible("PowerBook6,5") ||
> >             machine_is_compatible("PowerBook6,4") ||
> >             machine_is_compatible("PowerBook5,5") ||
> >             machine_is_compatible("PowerBook5,4")) {
> >                 pmac_cpufreq_init_7447A(cpunode);
> > 
> > Though that code will probably think you are running at high speed which
> > isn't the case apparently... We probably need to add some code to read
> > back the current speed mode from the processor to get the initial speed
> > correct or all the kernel delay loops will be broken.
> 
> That did the trick, decided to give a try to 2.6.11-rc5 and modified
> arch/ppc/platforms/pmac_cpufreq.c to look like this:
> 
>         /*  Check for 7447A based iBook G4 or PowerBook */
>         if (machine_is_compatible("PowerBook6,8") || /* My CPU */
>             machine_is_compatible("PowerBook6,5") ||
>             machine_is_compatible("PowerBook6,4") ||
>             machine_is_compatible("PowerBook5,5") ||
>             machine_is_compatible("PowerBook5,4")) {
>                 pmac_cpufreq_init_7447A(cpunode);
> 
> Thank's a lot, I can now use full speed (cpufreq works again).

It might incorrectly think it's running at full speed at boot tho, you
may have to force a transition. I'm looking into cleaning that up.

Ben.