On Wed, 2006-05-24 at 10:04 +0200, Brice Goglin wrote:
> I am not sure what you mean.
> The only ppc64 with PCI-E that we have seen so far (a G5) couldn't do
> write combining according to Apple.
That is not 100% true.... I don't know what apple had in mind. It also
depends in what slot you are.
Do you have ways to measure the difference ?
Try doing __ioremap(mgp->iomem_base, mgp->board_span, _PAGE_NO_CACHE);
instead of using the normal ioremap for #ifdef powerpc and tell us if it
makes a difference.
Ben.
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