From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 284ACC43460 for ; Tue, 27 Apr 2021 12:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E74B960E09 for ; Tue, 27 Apr 2021 12:16:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236047AbhD0MRf (ORCPT ); Tue, 27 Apr 2021 08:17:35 -0400 Received: from angie.orcam.me.uk ([157.25.102.26]:39598 "EHLO angie.orcam.me.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235410AbhD0MRd (ORCPT ); Tue, 27 Apr 2021 08:17:33 -0400 Received: by angie.orcam.me.uk (Postfix, from userid 500) id 87CD092009C; Tue, 27 Apr 2021 14:16:47 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by angie.orcam.me.uk (Postfix) with ESMTP id 7CD1092009B; Tue, 27 Apr 2021 14:16:47 +0200 (CEST) Date: Tue, 27 Apr 2021 14:16:47 +0200 (CEST) From: "Maciej W. Rozycki" To: Thomas Bogendoerfer cc: "H. Nikolaus Schaller" , Arnd Bergmann , Huacai Chen , Huacai Chen , Jiaxun Yang , linux-arch@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] MIPS: Avoid DIVU in `__div64_32' is result would be zero In-Reply-To: Message-ID: References: <284CBC37-0F4F-4077-A172-7E47C90B8B43@goldelico.com> <20210422075645.GA5996@alpha.franken.de> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 22 Apr 2021, Maciej W. Rozycki wrote: > NB, I have benchmarked the update with my DECstation, however my Malta > has not come up after a reboot last evening and neither it has after a few > remote power cycles. I have planned a visit in my lab next week anyway, > so I'll see what has happened there; hopefully I'm able to bring the board > back to life as I find it valuable for my purposes. I had to replace the > PSU it came with already a couple years back and the new one is supposedly > high-quality, so I fear it's the board itself. For the record I have put the Malta back in service now. It was weird: the YAMON status shown on the ASCII display was "E:P_UNKN", i.e. "Unknown PCI device on board (should never happen)" (according to the manual). Indeed I never saw that message before. By elimination I have tracked down the DEFPA FDDI network interface to be the culprit and upon a close inspection found a bent pin with the PFI ASIC (the PCI interface chip), a 160-pin 20-mil PQFP part. It was IDSEL shorting to RST_L, the adjacent pin. No wonder the card wreaked havoc with the system. Fixed by carefully moving the pins apart with a razor blade (always good to have one at hand!). Now I wonder how this card happened to work with the pin bent for some 15 years and only finally developed a short now. Weird indeed, and weirder even to see a second failure related to IC pins this year only. Maciej