Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S969071AbXEIFIx (ORCPT ); Wed, 9 May 2007 01:08:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754909AbXEIFIq (ORCPT ); Wed, 9 May 2007 01:08:46 -0400 Received: from terminus.zytor.com ([192.83.249.54]:48173 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754654AbXEIFIp (ORCPT ); Wed, 9 May 2007 01:08:45 -0400 Message-ID: <4641573C.1000205@zytor.com> Date: Tue, 08 May 2007 22:08:12 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: yhlu CC: "Eric W. Biederman" , Jeremy Fitzhardinge , vgoyal@in.ibm.com, Gerd Hoffmann , Jeff Garzik , patches@x86-64.org, linux-kernel@vger.kernel.org, virtualization , Rusty Russell , Andi Kleen , Ingo Molnar Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage References: <4634483E.9030307@goop.org> <86802c440705081500x682ee098y7d51f7bb98dbcff6@mail.gmail.com> <4640F4B3.30408@goop.org> <4640FB2C.2060300@zytor.com> <86802c440705081541v7d0773cek2c5fae1854b68bbc@mail.gmail.com> <46410403.4050802@zytor.com> <46413087.2020505@zytor.com> <86802c440705082152g49d4d3echf3eb165ce4feb2e9@mail.gmail.com> <46415640.6000600@zytor.com> In-Reply-To: <46415640.6000600@zytor.com> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1206 Lines: 26 H. Peter Anvin wrote: > yhlu wrote: >> On 5/8/07, Eric W. Biederman wrote: >>> Since the whole point is to detect the case where we don't have >>> a screen at all it makes sense to check several additional variables >>> and make certain that they are all 0. Agreed? >> need one good way to find if there is support vga console. > > There really isn't one, at least not given the current data structure; > the data structure has an "isVGA" flag, but if that is 0 it's supposed > to mean CGA/MDA/HGC/EGA, as opposed to VGA... Of course, one could argue that since all of those were obsolete by the time Linux was first created, that it probably doesn't matter and that isVGA == 0 pretty much means the more obvious thing. MDA/HGC stuck around for quite a while for debugging, since it was non-conflicting with VGA, but even if it is, the reason people put it in their system is to have something that the OS doesn't readily see. -hpa - 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/