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=-2.3 required=3.0 tests=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 5A637C4BA24 for ; Thu, 27 Feb 2020 11:39:20 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2E8CD24690 for ; Thu, 27 Feb 2020 11:39:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E8CD24690 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=eik.bme.hu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j7HVf-0003wB-7x for qemu-devel@archiver.kernel.org; Thu, 27 Feb 2020 06:39:19 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:43565) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j7HUd-0003Fg-9R for qemu-devel@nongnu.org; Thu, 27 Feb 2020 06:38:16 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j7HUY-0007QI-Q8 for qemu-devel@nongnu.org; Thu, 27 Feb 2020 06:38:14 -0500 Received: from zero.eik.bme.hu ([2001:738:2001:2001::2001]:37373) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j7HUT-0007Nq-Gy for qemu-devel@nongnu.org; Thu, 27 Feb 2020 06:38:10 -0500 Received: from zero.eik.bme.hu (blah.eik.bme.hu [152.66.115.182]) by localhost (Postfix) with SMTP id 8EAB77475F6; Thu, 27 Feb 2020 12:38:04 +0100 (CET) Received: by zero.eik.bme.hu (Postfix, from userid 432) id 7393B7461AE; Thu, 27 Feb 2020 12:38:04 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by zero.eik.bme.hu (Postfix) with ESMTP id 71F1D74569F; Thu, 27 Feb 2020 12:38:04 +0100 (CET) Date: Thu, 27 Feb 2020 12:38:04 +0100 (CET) From: BALATON Zoltan To: jasper.lowell@bt.com Subject: Re: [PATCH] hw/ide: Remove status register read side effect In-Reply-To: Message-ID: References: <20200221065015.337915-1-jasper.lowell@bt.com> <5f336bc8838b5bfebfcc5829a3fae0a34a2ebac0.camel@bt.com> <5ca992b3a358610c897d923009fe9f7a8febc17f.camel@bt.com> <2e972e94627a39cf45504ed244828d065d743910.camel@bt.com> User-Agent: Alpine 2.22 (BSF 395 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2001:738:2001:2001::2001 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jsnow@redhat.com, mark.cave-ayland@ilande.co.uk, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, 27 Feb 2020, jasper.lowell@bt.com wrote: > I've since looked at a Ultra 5 board and can confirm that it shipped > with a CMD646U chip like the Ultra 10. If you have access to an Ultra 5 maybe you could try testing what it does with irqs. That should give the ultimate answer to our guessing. It may need patching a Linux driver to log more info and recompile the kernel so not sure you have time for that but maybe it would help if you can do it. Regards, BALATON Zoltan