[PATCH] powermac: support G5 CPU hotplug

[Paul Mackerras]

Benjamin Herrenschmidt writes:

> On Wed, 2007-05-02 at 16:33 +0200, Johannes Berg wrote:
> > On Wed, 2007-05-02 at 20:55 +1000, Paul Mackerras wrote:
> > 
> > > Ultimately we want to put the disabled cpus in sleep mode, but that
> > > will require a suitable cache flush routine.
> > 
> > I don't have any docs for the particular processors the G5s have, do
> > they have a sleep mode?
> 
> They have, but the cache flush is not trivial to do (and might imply
> access to non documented bits). So let's put that on the to-do list and
> stick to NAP for now while I dig something.

Hmmm, I went looking in the 970FX manual for sleep mode and didn't
find it, only nap and doze...

Paul.