From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751834Ab3KPJ2v (ORCPT ); Sat, 16 Nov 2013 04:28:51 -0500 Received: from mout.gmx.net ([212.227.17.22]:50212 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751246Ab3KPJ2n (ORCPT ); Sat, 16 Nov 2013 04:28:43 -0500 Date: Sat, 16 Nov 2013 10:28:38 +0100 From: Andreas Werner To: One Thousand Gnomes Cc: linux-kernel@vger.kernel.org Subject: Re: Black screen with GMA500 driver on Atom E680 (invalid VBT signature) Message-ID: <20131116092838.GA2564@thinkpad.fritz.box> References: <20131113183418.GA1593@thinkpad.fritz.box> <20131114135209.0a8a15ff@alan.etchedpixels.co.uk> <20131114182523.GA2133@thinkpad.fritz.box> <20131114205758.78c0788d@alan.etchedpixels.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131114205758.78c0788d@alan.etchedpixels.co.uk> User-Agent: Mutt/1.5.21 (2010-09-15) X-Provags-ID: V03:K0:JNUiHjKclbpG5WPSct8n7keYNluPeyMDmOQYEpIjUV71ZSi25TD onz3PFjYTp+esNyh4Q5hIHLUr/ZSAcAks62kG+yhWGNbdmIjrelJ4sUnNj8qrxjL2xUpYDz vfC03WmWzL1eSZh2qhwNbRTXRZ+o68UGwuCHPnwVSzdb95vnuoXL3L7TG4qQBoiXV/IwHyH W+ZnROzG3+00752qRq8Lw== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 14, 2013 at 08:57:58PM +0000, One Thousand Gnomes wrote: > > but if you checkout the PCI table in the driver, there is the device > > and vendor ID mentioned, that means for me that the driver supports > > the Graphic core in E680. > > And after loading the driver, it will parse for $VBT. > > I just find a comment in the PCI table with "E620" but > > the device and vendor id is the same for E680. > > > > What do you mean with "Moorestown style" ? > > There are essentially two styles of configuration table used with PVR > graphics. One is basically the same as that used on 'real' Intel graphics > the other first introduced with one of the SoC devices is a firmware > table in a completely different format. > > The netbook and PC oriented devices use the VBT, the tablet SoC > devices and embedded ones seem to vary and have a VBT/GCT in different > form that is found via config 0xFC on the chipset - see mid_bios.c > > Alan Hi, if i dump the memory on 0xFC of the config space, there is just some from the BIOS vendor with a BIOS Version, but nothing like $GCT. In the Datasheet the 0xFC is described as "storage" does it mean there should be the settings for the Graphic like VBT? I did not find more information abaout GCT and how to implement it. The board uses sdvo->vga for the output, the second board uses sdvo->DVI and LVDS but there is always a black screen on each output interface. So i think there is wether a VBT not a GCT. Regards andy