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Date: Mon, 11 Dec 2000 15:58:23 -0600
From: " Paul C. Nendick " <pnendick@highku.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: John Cavan <johncavan@home.com>, Petr Vandrovec <VANDROVE@vc.cvut.cz>,
        linux-kernel@vger.kernel.org
Subject: Re: 2.2.16 SMP: mtrr errors
Message-ID: <20001211155822.A1901@thefunk.org>
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In-Reply-To: <E145wtZ-0001pn-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Tue, Dec 12, 2000 at 09:23:30PM +0000
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Shall I submit this to Matrox as a bug then?

/paul

Alan Cox (alan@lxorguk.ukuu.org.uk) said:

> > 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
> 

-- 
Paul C. Nendick
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