First cut at large page support on 40x

[Armin]

David Gibson
>
> Heh, so instead we got a half-assed re-implementation (with a whole
> bunch of extraneous pointless crap) in the form of the OCP layer.
>

Crap...this pointless crap has made it easier to add driver support to
new IBM 4xx processors. And the Idea goes beyond PPC :)  Cosmetic
changes don't help make things not half-assed and mature.  Flushing the
idea, API's and usage does.

  armin

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