From: "H. Peter Anvin" <hpa@zytor.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: "Diego M. Vadell" <dvadell@linuxclusters.com.ar>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: PAT and MTRRs
Date: Sun, 26 Oct 2008 17:38:23 -0700 [thread overview]
Message-ID: <49050D7F.4000906@zytor.com> (raw)
In-Reply-To: <20081026173458.44c5a036@infradead.org>
Arjan van de Ven wrote:
>>>
>> Now, if it wasn't for the braindamage called ACPI and SMM, we could
>> have cleared the MTRR settings and just used PAT...
>
> yeah.. one thing we need to investigate is if we can set the default
> "no mtrr coverage" value to cached
> (and also.. to check we don't set that to uncached if the bios had it
> set to cached..)
>
Well, in the end it comes down to the same thing: SMM expects the memory
map to reside in MTRRs. We can "sanitize" the memory map, but we can't
throw it out the window like what we really should be able to.
-hpa
next prev parent reply other threads:[~2008-10-27 0:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-26 23:46 PAT and MTRRs Diego M. Vadell
2008-10-27 0:12 ` Arjan van de Ven
2008-10-27 0:21 ` H. Peter Anvin
2008-10-27 0:34 ` Arjan van de Ven
2008-10-27 0:38 ` H. Peter Anvin [this message]
2008-10-27 5:17 ` Yinghai Lu
2008-10-31 22:42 ` Diego M. Vadell
2008-10-31 23:19 ` Yinghai Lu
2008-10-31 23:35 ` Yinghai Lu
2008-11-11 14:30 ` Diego M. Vadell
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