Messages in this thread | | | Date | Thu, 15 Mar 2012 14:54:03 +0000 | From | Matthew Garrett <> | Subject | Re: [PATCH] EFI: Only set regions uncacheable if they support it |
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On Thu, Mar 15, 2012 at 07:47:57AM -0700, H. Peter Anvin wrote:
> WTF?! That should be UC at all times... it isn't even WC-capable. > Furthermore, we may need this region (assuming there is actually a video > card there.)
I don't think we'll ever use this region on UEFI. What I have from Intel is:
"It looks like this is happening when the kernel iterates over the various regions in the EFI memory map. It hits a region starting at 0xA0000 and attempts to do a CLFLUSH instruction on that address. This is explicitly forbidden by the SAD in (codename), thus the Machine Check."
> What do the fixed MTRRs look like?
Unsure. I'll try to find out.
-- Matthew Garrett | mjg59@srcf.ucam.org
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