Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753824AbaDDPkU (ORCPT ); Fri, 4 Apr 2014 11:40:20 -0400 Received: from terminus.zytor.com ([198.137.202.10]:49789 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753021AbaDDPkT (ORCPT ); Fri, 4 Apr 2014 11:40:19 -0400 Message-ID: <533ED247.9040602@zytor.com> Date: Fri, 04 Apr 2014 08:39:51 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Matthew Garrett CC: "Li, Aubrey" , Steven Rostedt , Ingo Molnar , Linus Torvalds , LKML , Thomas Gleixner Subject: Re: [BUG] x86: reboot doesn't reboot References: <20140403113921.23dceb75@gandalf.local.home> <533D8516.1040803@zytor.com> <20140403121314.246b03a7@gandalf.local.home> <533DED74.6050202@linux.intel.com> <20140403194018.7c67aec7@gandalf.local.home> <533DF455.4040908@linux.intel.com> <533DF8D2.9060508@zytor.com> <533E0A94.5040007@linux.intel.com> <20140404151203.GA12370@srcf.ucam.org> <533ECC2C.6090505@zytor.com> <20140404153634.GA14519@srcf.ucam.org> In-Reply-To: <20140404153634.GA14519@srcf.ucam.org> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/04/2014 08:36 AM, Matthew Garrett wrote: > On Fri, Apr 04, 2014 at 08:13:48AM -0700, H. Peter Anvin wrote: >> On 04/04/2014 08:12 AM, Matthew Garrett wrote: >>> On Fri, Apr 04, 2014 at 09:27:48AM +0800, Li, Aubrey wrote: >>> >>>> The current situation is, >>>> - we have one(do we know more?) preproduction machine hangs by CF9. >>>> - We have more than one(could be thousand known) production machine >>>> works by CF9. >>> >>> Production hardware should never require CF9. >>> >> >> There are a lot of things that shouldn't be. > > Windows doesn't hit CF9, and production hardware is always tested with > Windows, so. Adding CF9 may make things work in some situations but it > clearly breaks them in others - we'd be better off spending our time > figuring out why systems that appear to need CF9 won't otherwise work. > There are several platforms where the default boot method invokes an SMM handler which blithly assumes that the hardware is in whatever state Windows leaves it in, and hangs otherwise. This seems to include nearly all Dell systems. So it isn't really quite that simple... -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/