Re: [PATCH] PCI updates - prefetchable memory regions

Russell King (rmk@arm.linux.org.uk)
Thu, 20 Dec 2001 13:36:19 +0000

On Thu, Dec 20, 2001 at 04:13:31PM +0300, Ivan Kokshaysky wrote:
> This looks fine, but I don't like the idea of artificial splitting
> the PCI memory region if we want prefetch support.

Could you explain this a bit better. The reason we need to split the
prefetchable regions from the non-prefetchable regions is that most
bridges can only cope with one region which is prefetchable.

Also, some machines have a limited (sometimes fixed address and size)
region that can only be used for prefetchable memory. How do you cater
for this?

--
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html


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