Subject: Re: 2.2.16 SMP: mtrr errors
To: johncavan@home.com (John Cavan)
Date: Tue, 12 Dec 2000 21:23:30 +0000 (GMT)
Cc: VANDROVE@vc.cvut.cz (Petr Vandrovec),
        pauly@enteract.com ( Paul C. Nendick), linux-kernel@vger.kernel.org
In-Reply-To: <3A3693A8.E0BA83B7@home.com> from "John Cavan" at Dec 12, 2000 04:07:52 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

> Petr, the Matrox card splits the memory between the two video screens
> when running in a multi-head configuration and "pretends" that it is two
> distinct cards. Thus, a 32 mb card will register an mtrr for 24mb and
> for 8mb seperately when in this mode.

That is a driver bug. The intel processors only support MTRR's on certain
power boundaries/sizes. The fall through is intended. 

> to fall through, but is this correct? I've inserted a break at the end
> of the Intel switch before and have not had problems, but I left it out

Lucky

> in the latest couple of kernels because of all the mtrr work being done,
> waiting to see if there was resolution.

The Matrox driver needs to register a single 32Mb MTRR

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