On Sat, Aug 12, 2006 at 08:29:49PM +0200, Segher Boessenkool wrote:

> >It is not necessarily the processors PIR register value, nor does  
> >it have any other meaning.
> You can set the PIR to whatever you want, it's R/W.

It doesn't have to be. Book3 2.02 says:

"Read access to the PIR is privileged; write access, if provided, is
described in the Book IV, PowerPC Implementation Features document for
the implementation".

In other words, it's up to the implemenation if it's writable or
not, and how it's writable: Chip in init scans, mtspr or other ways.


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