Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757482Ab0DIVAN (ORCPT ); Fri, 9 Apr 2010 17:00:13 -0400 Received: from imr2.ericy.com ([198.24.6.3]:51612 "EHLO imr2.ericy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751974Ab0DIVAK (ORCPT ); Fri, 9 Apr 2010 17:00:10 -0400 Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86_32 From: Guenter Roeck Reply-To: guenter.roeck@ericsson.com To: "H. Peter Anvin" , linux-kernel@vger.kernel.org CC: Yinghai , Linus Torvalds , Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , "linux-pci@vger.kernel.org" , "x86@kernel.org" , Andy Isaacson , Thomas Renninger In-Reply-To: <4BBF91C6.9090701@zytor.com> References: <20100407210628.28364.96982.stgit@bob.kio> <201004071705.07176.bjorn.helgaas@hp.com> <4BBD13C3.2060404@oracle.com> <201004091004.39857.bjorn.helgaas@hp.com> <4BBF5987.3010100@zytor.com> <4BBF626A.3060800@oracle.com> <4BBF70BC.3080809@zytor.com> <1270839357.1477.758.camel@groeck-laptop> <4BBF89FE.5040909@zytor.com> <1270845108.1477.784.camel@groeck-laptop> <4BBF91C6.9090701@zytor.com> Content-Type: text/plain Organization: Ericsson Date: Fri, 9 Apr 2010 14:01:02 -0700 Message-ID: <1270846862.1477.788.camel@groeck-laptop> MIME-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1100 Lines: 30 On Fri, 2010-04-09 at 16:44 -0400, H. Peter Anvin wrote: > On 04/09/2010 01:31 PM, Guenter Roeck wrote: > > > > It is used for a custom FPGA implementing a watchdog timer and some > > other functionality. > > > > This is not a matter of supporting such a device in Linux, it is a > > matter of explicitly excluding non-VGA devices from using VGA memory > > space. > > > > If that is the decision, it might be worthwhile mentioning it somewhere > > in the documentation, to prevent others from ever using that memory > > space in an embedded system (and to save them the time needed to find > > out about it and to identify and implement a workaround). > > > > "Don't use legacy fixed-function addresses for nonstandard purposes." > > There, there is your documentation. Fair and good enough, as long as it is going to show up somewhere. Guenter -- 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/