From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756653Ab0GaVD6 (ORCPT ); Sat, 31 Jul 2010 17:03:58 -0400 Received: from terminus.zytor.com ([198.137.202.10]:36140 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753300Ab0GaVD4 (ORCPT ); Sat, 31 Jul 2010 17:03:56 -0400 Message-ID: <4C548F7D.6000509@zytor.com> Date: Sat, 31 Jul 2010 14:02:53 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1 MIME-Version: 1.0 To: Cyrill Gorcunov CC: Yinghai Lu , Ingo Molnar , Thomas Gleixner , Pekka Enberg , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] x86,setup: add serial_console_port_base in boot_params References: <4C3F8B46.7080809@kernel.org> <20100731083409.GC5859@lenovo> <4C5469AF.2010608@zytor.com> <20100731183211.GB29357@lenovo> In-Reply-To: <20100731183211.GB29357@lenovo> 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 07/31/2010 11:32 AM, Cyrill Gorcunov wrote: >> >> No, this is the internal part of the boot protocol, so it's not an issue. >> > > Peter, I didn't mean any issue here, I meant that bootloaders don't know about > this field yet and they will have to update own sources to pass port value > at proper place of boot params. Or I miss something? > Boot loaders that use the 16-bit entry point are unaffected. Boot loaders which use the 32-bit entry point but properly clears the zero page simply will not have the feature. Boot loaders which use the 32-bit entry point but doesn't clear the zero page are broken. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.