[coreboot] I've turned on paging as a test
adurbin at chromium.org
Tue Mar 11 01:03:37 CET 2014
On Mon, Mar 10, 2014 at 5:00 PM, ron minnich <rminnich at gmail.com> wrote:
> I think the bigger question that we need to answer, now that we know
> it's doable, is whether we want paging or not. We may not. I was hoping
> it would give us a more convenient way to cover cache-disabled, write-back,
> and write-through ranges without all the fuss of MTRRs. But there may be
> other issues that make it impractical. I'm open to discussion.
I assume you were wanting use PAT to cover different regions? Sadly,
the precedence for "upgrading" the caching type is from UC to WC.
There is no way to turn a UC MTRR region into a WP region through PAT.
At least that's what I recall when I looked it up a couple of weeks
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