From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756451Ab1KHWhw (ORCPT ); Tue, 8 Nov 2011 17:37:52 -0500 Received: from mail.skyhub.de ([78.46.96.112]:39073 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755926Ab1KHWhv (ORCPT ); Tue, 8 Nov 2011 17:37:51 -0500 Date: Tue, 8 Nov 2011 23:37:44 +0100 From: Borislav Petkov To: Daniel Drake Cc: "H. Peter Anvin" , Borislav Petkov , "linux-kernel@vger.kernel.org" Subject: Re: Geode LX boot fails after x86 microcode revision change Message-ID: <20111108223744.GA1996@x1.osrc.amd.com> Mail-Followup-To: Borislav Petkov , Daniel Drake , "H. Peter Anvin" , Borislav Petkov , "linux-kernel@vger.kernel.org" References: <20111108203116.GF25083@aftab> <4EB9A6BC.7050600@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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, Nov 08, 2011 at 04:17:21PM -0600, Daniel Drake wrote: > On Tue, Nov 8, 2011 at 4:13 PM, Petkov, Borislav > wrote: > > This could definitely explain why it hangs, the rdmsr_safe call is > >  in early_init_amd(), so it could really be too early for exception tables. > > I think this is almost certainly the cause too. The symptoms of this > issue are exactly the same as the early boot hang once discussed in a > thread titled "Dynamic nop selection breaks boot on Geode LX" (which > you wrote to as well) which was a problem of running code before > having exception tables set up. Oh yeah, that. > I haven't yet run your tests except for "rdmsr 0x8b" which returns > "pread: Input/output error" - let me know if you would still like > results from the other tests. Yep, just send me /proc/cpuinfo from a working kernel. Thanks. -- Regards/Gruss, Boris