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xen-ppc-devel
Re: [XenPPC] [PATCH/RFC] Run C code that inits HID registers from second
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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