Re: Multifunction Graphics Adapters

[sas@corp.cirrus.com (Stephen A. Smith)]

> From pci-sig-request@znyx.com Mon Nov  4 09:20:38 1996
> Return-Path: <pci-sig-request@znyx.com>
> Resent-From: pci-sig-request@znyx.com
> Resent-Date: Mon, 4 Nov 96 11:16:14 -0500
> In-Reply-To: <640D7E32019C1400>
> Sender: "Bender, Bernhard" <br@elsa.de>
> Organization: ELSA GmbH
> Subject: Re: Multifunction Graphics Adapters
> Mime-Version: 1.0
> Content-Type> : > text/plain> ; > charset="US-ASCII"> 
> Content-Transfer-Encoding: 7BIT
> X-Mailer: Connect2-SMTP 4.00 MHS to SMTP Gateway
> Resent-Message-Id: <"QrKue.0.lO.H6ZVo"@dart>
> X-Mailing-List: <pci-sig@znyx.com> archive/latest/3872
> X-Loop: pci-sig@znyx.com
> Precedence: list
> Resent-Sender: pci-sig-request@znyx.com
> To: Mailing List Recipients <pci-sig-request@znyx.com>
> Content-Length: 883
> X-Lines: 26
> 
> Rudy,
> 
> If all of the functionality is inside one chip, I would strongly 
> recommend to use only one PCI config header.

This is not the way to go. When we did the first PCI based PCMCIA
controller we used only one config space. Now everyone has to special
case this '94 vintage part 'cause it is not right. Get the software
fixed and don't break the part, 'cause it will be a long time causing
problems if you do it wrong.

SA Smith

> 
> Our experience shows that using two functions that both identify 
> themselves as display devices in their class codes cause huge problems 
> unter Win95. You'll get resource conflicts (that are not physically real, 
> but Win95 creates them for you) and installation of drivers will be 
> troublesome (exactly the opposite of PnP).
> 
> The least you should do is to give the second functions unit any 
> reasonable class code other than display. 
> 
> But, why don't you simple add the second function's resources (BARs) to 
> the first (VGA)? 
> 
> Bernhard Bender
> ---
> Group Manager Core Technology   ELSA Computer Graphics
> 
> ELSA GmbH             		Email: br@elsa.de
> Sonnenweg 11                    Fax  : +49 (2405) 450 100
> D-52 070 Aachen, Germany        WWW  : http://www.elsa.de
> 
> 
> 
æÔÁ