From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754488AbaHUU5q (ORCPT ); Thu, 21 Aug 2014 16:57:46 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:37009 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753571AbaHUU5p (ORCPT ); Thu, 21 Aug 2014 16:57:45 -0400 Date: Thu, 21 Aug 2014 21:52:24 +0100 From: Matt Fleming To: Dave Young Cc: lv.zheng@intel.com, matt.fleming@intel.com, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, devel@acpica.org, lenb@kernel.org, rafael.j.wysocki@intel.com, robert.moore@intel.com Subject: Re: kernel boot fail with efi earlyprintk (bisected) Message-ID: <20140821205224.GJ29733@console-pimps.org> References: <20140819081658.GA1795@darkstar.nay.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140819081658.GA1795@darkstar.nay.redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 19 Aug, at 04:16:58PM, Dave Young wrote: > Hi, > > 3.16 kernel boot fail with earlyprintk=efi on my laptop. > It keeps scrolling at the bottom line of screen. > > Bisected, the first bad commit is below: > commit 86dfc6f339886559d80ee0d4bd20fe5ee90450f0 > Author: Lv Zheng > Date: Fri Apr 4 12:38:57 2014 +0800 > > ACPICA: Tables: Fix table checksums verification before installation. > > > I did some debugging by enabling both serial and efi earlyprintk, below is > some debug dmesg, seems early_ioremap fails in scroll up function due to > no free slot, but I'm still not sure if the debug info is right or not. Thanks Dave, your callstack seems to make sense. Can you also enable early_ioremap_debug so that we can figure out where all the FIXMAP slots are going? -- Matt Fleming, Intel Open Source Technology Center