[OpenBIOS] PowerPC special purpose registers

[Segher Boessenkool]

On Mon, May 02, 2016 at 10:47:17PM -0400, Lennart Sorensen wrote:
> Certainly page 59 of https://fail0verflow.com/media/files/ppc_750cl.pdf
> says the 750CL does not implement that register, but will allow writes
> to it without exception for compatibility reasons.  Certainly makes it
> sound like a number of models might implement it.  Same for 750GX.

All 750 (including 7400/7410) have a dummy register there, yeah
(but 7450 etc. do not).  All those work with OS9 of course (and all
that code works properly in QEMU, we have checked -- it is much more
than those few printf's show).


Segher