Messages in this thread | | | Date | Thu, 15 Mar 2012 14:51:25 +0000 | From | Alan Cox <> | Subject | Re: [PATCH] EFI: Only set regions uncacheable if they support it |
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On Thu, 15 Mar 2012 14:42:36 +0000 Matthew Garrett <mjg@redhat.com> wrote:
> On Thu, Mar 15, 2012 at 07:36:46AM -0700, H. Peter Anvin wrote: > > > I would still really like to understand why we're seeing #MCs... that's > > bothersome all by itself. > > The region is the legacy video RAM, so I can imagine there being > something magic about it.
Presumably by the point we are booting the firmware and our own early activities mean the pages are already marked write-combine and in our CPU caches somewhere. Is the current boot code flushing any legacy video mappings from cache before it plays with the cachability ?
Alan
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