Re: [XenPPC] [PATCH/RFC] Run C code that inits HID registers from secondary procs

[Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>]

> > > 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".
Yeah.  We were talking specifically about 970 though (or I was at
least, heh).

> 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.
...and I goofed: PIR is R/O on 970, it's initialised via a bunch
of pin straps on the CPU package.


Segher


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