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Re: pci_mapreg_map(9) and prefetchable BARs

On Wed, 10 Aug 2011, Michael wrote:
I don't think there's any MMU out there which could apply anything like this to something smaller than a page. No idea which granularity x86 MTRRs allow but it's probably not that small either.

FYI for BUS_SPACE_MAP_PREFETCHABLE on x86 we actually use the Page Attribute Table (PAT), not MTRRs.


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