Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751427AbdINAi6 (ORCPT ); Wed, 13 Sep 2017 20:38:58 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:55358 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751173AbdINAi4 (ORCPT ); Wed, 13 Sep 2017 20:38:56 -0400 Subject: Re: Regression for Power PC in 4.14-rc0 - bisected to commit 31bfdb036f12 To: Larry Finger , Benjamin Herrenschmidt , Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org, LKML References: <201709140009.v8E08n9S024108@mx0a-001b2d01.pphosted.com> From: Andrew Donnellan Date: Thu, 14 Sep 2017 10:37:24 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <201709140009.v8E08n9S024108@mx0a-001b2d01.pphosted.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-AU Content-Transfer-Encoding: 8bit X-TM-AS-MML: disable x-cbid: 17091400-0040-0000-0000-000003560582 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17091400-0041-0000-0000-00000CD653D8 Message-Id: <77fb14dd-26d5-a647-bed1-142d56d26374@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-09-13_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1709140008 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 863 Lines: 21 On 14/09/17 10:07, Larry Finger wrote: > When booting my PowerBook Aluminum G4, I get a pop-up screen that says > "The system is running in low-graphics  mode. Your screen, graphics > card, and input device settings could not be detected correctly. You > will need to configure these yourself." This is a big-endian 74xx CPU. > The lscpu command says it is a PowerBook5,6 model. > > This problem has been bisected to commit 31bfdb036f12 ("powerpc: Use > instruction emulation infrastructure to handle alignment faults"). I am > confident of the accuracy of the bisection. > > Attached is the configuration. Try with https://patchwork.ozlabs.org/patch/813153/ (A selftest for the instruction emulation will make its way upstream eventually...) -- Andrew Donnellan OzLabs, ADL Canberra andrew.donnellan@au1.ibm.com IBM Australia Limited