Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754454AbaDFSlB (ORCPT ); Sun, 6 Apr 2014 14:41:01 -0400 Received: from terminus.zytor.com ([198.137.202.10]:45901 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754207AbaDFSk7 (ORCPT ); Sun, 6 Apr 2014 14:40:59 -0400 Message-ID: <53419F84.2090204@zytor.com> Date: Sun, 06 Apr 2014 11:40:04 -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: One Thousand Gnomes , Matthew Garrett CC: "Li, Aubrey" , Ingo Molnar , linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, rostedt@goodmis.org, tglx@linutronix.de, linux-tip-commits@vger.kernel.org, Adam Williamson Subject: Re: [tip:x86/reboot] [PATCH] x86: Try the BIOS reboot method before the PCI reboot method References: <20140404064120.GB11877@gmail.com> <20140404080006.GB6944@gmail.com> <533EB5F1.8060002@linux.intel.com> <20140404151359.GB12370@srcf.ucam.org> <20140406184023.1e31412d@alan.etchedpixels.co.uk> In-Reply-To: <20140406184023.1e31412d@alan.etchedpixels.co.uk> 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 04/06/2014 10:40 AM, One Thousand Gnomes wrote: > On Fri, 4 Apr 2014 16:13:59 +0100 > Matthew Garrett wrote: > >> On Fri, Apr 04, 2014 at 09:38:57PM +0800, Li, Aubrey wrote: >> >>> I don't think there is enough justification to revert the patch. We >>> introduce EFI into the default list, we didn't see any reason to remove >>> it out so far. >> >> We should be using the EFI method, yes. But it seems that CF9 isn't >> safe, so we should drop that. >> > > Windows does not use CF9 and there are known, documented cases where CF9 > will not work reliably. That includes reliable reboot on some Baytrail > systems. (Erratum VLT60 and VLT62). > > So we really shouldn't be doing 0xCF9 except as a last resort if we are > still alive and have been through the official reboot methods. > No question. The question at hand is if we should do it after all other non-terminal (BIOS, triple) methods have been tried. -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/