From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Fleming Subject: Re: kernel boot fail with efi earlyprintk (bisected) Date: Thu, 21 Aug 2014 21:52:24 +0100 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 Return-path: Content-Disposition: inline In-Reply-To: <20140819081658.GA1795@darkstar.nay.redhat.com> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-acpi@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