Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964846AbWEYCJc (ORCPT ); Wed, 24 May 2006 22:09:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964850AbWEYCJc (ORCPT ); Wed, 24 May 2006 22:09:32 -0400 Received: from smtp.enter.net ([216.193.128.24]:31503 "EHLO smtp.enter.net") by vger.kernel.org with ESMTP id S964846AbWEYCJc (ORCPT ); Wed, 24 May 2006 22:09:32 -0400 From: "D. Hazelton" To: Matthew Garrett Subject: Re: OpenGL-based framebuffer concepts Date: Wed, 24 May 2006 22:09:21 +0000 User-Agent: KMail/1.8.1 Cc: Jon Smirl , Matthew Garrett , Kyle Moffett , Manu Abraham , linux cbon , Helge Hafting , Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org References: <20060519224056.37429.qmail@web26611.mail.ukl.yahoo.com> <9e4733910605231638t4da71284oa37b66a88c60cf8a@mail.gmail.com> <20060524220827.GA12192@srcf.ucam.org> In-Reply-To: <20060524220827.GA12192@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200605242209.22787.dhazelton@enter.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1323 Lines: 26 On Wednesday 24 May 2006 22:08, Matthew Garrett wrote: > On Tue, May 23, 2006 at 07:38:40PM -0400, Jon Smirl wrote: > > 2) The ROM support in the kernel knows about the shadow RAM copy at > > C000::0. When you request the ROM from a laptop video system it > > returns a map to the shadow RAM copy, not to a physical ROM. You need > > access to the shadow RAM copy to get to things the BIOS left there > > when it ran. > > My experience is that, on some laptops, the code at c000:0003 may jump > into some other address block that isn't necessarily shadowed. There's > no reason to assume that POSTing an ancilliary ROM will work after the > system has left the BIOS. Further, my laptop doesn't appear to have a > rom entry in sysfs, which makes getting at stuff that way rather more > awkward... As has been previously stated, the kernel should have already setup the primary video card by that point. EDID information can be used to get information about valid modes. I don't know of a single laptop that has multiple video cards in it. If you do, please enlighten me. DRH - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/