PATCH: improved processor config for G3s

[Adrian Cox]

Gabriel Paubert wrote:
> So you need at least 3 writes, or to have one store buffer busy with a
> previous write, to trigger the store gathering mechanism. This makes it
> impossible to predict whether it will be used or not, and IMO not worth
> the potential trouble since it will actually happen quite infrequently.

This condition should be satisfied by memcpy_toio(). It won't be
satisfied by fb_memmove(), which is the function that makes large
virtual consoles on PowerPC so slow.

It might be more interesting to try an implementation of memcpy_toio()
using the DMA engines of the 106/7.

- Adrian Cox, AG Electronics

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