Misc 8260 fixes/options

[Allen Curtis]

> I don't believe this is correct for all PowerPC processors that have BATs.
> Can you verify this and ensure it works on everything?  I know 601s have
> different sized BATs, and the caller of this function really needs to know
> what they are doing to ensure this works correctly.

It is correct according to the comments for setbat(), I will double check.


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