From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754716Ab0DIQpX (ORCPT ); Fri, 9 Apr 2010 12:45:23 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35987 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754613Ab0DIQpV (ORCPT ); Fri, 9 Apr 2010 12:45:21 -0400 Message-ID: <4BBF5987.3010100@zytor.com> Date: Fri, 09 Apr 2010 09:44:55 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: Bjorn Helgaas CC: Yinghai , Thomas Gleixner , Ingo Molnar , linux-pci@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Andy Isaacson , Thomas Renninger Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86_32 References: <20100407210628.28364.96982.stgit@bob.kio> <201004071705.07176.bjorn.helgaas@hp.com> <4BBD13C3.2060404@oracle.com> <201004091004.39857.bjorn.helgaas@hp.com> In-Reply-To: <201004091004.39857.bjorn.helgaas@hp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/09/2010 09:04 AM, Bjorn Helgaas wrote: >> >> for 64 bit, you may check boot_params.screen_info.orig_video_isVGA to see if you need to reserve that VGA range. >> not sure if every bootloader fill that... > > Why is this different for 64-bit vs 32-bit? Can you point me to any > references where I can learn about this? > It's not. Any differences between 32 and 64 bits in this area are just plain wrong. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.