On Mon, Feb 27, 2012 at 11:38:14AM +0100, Linus Walleij wrote:

Maybe I'm delusional but I think this could help centralizing the use
of the SP* cells, since they're obviously used in both SPEAr and
versatile express.

They can be used in any PrimeXsys based system, and I don't see that
there's anything which guarantees having both a SP810 and SP804
together.

There are platforms which have SP804 without SP810 - Integrator CP
and bcmring seem to fall into that category.

But... the register concerned does a whole load of other things, and
I'm not sure we want to have accesses to it de-centralized.