From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 93F5920D2C3B9 for ; Wed, 29 Mar 2017 09:55:29 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0FAE180F90; Wed, 29 Mar 2017 16:55:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 0FAE180F90 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=lersek@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 0FAE180F90 Received: from lacos-laptop-7.usersys.redhat.com (ovpn-116-134.phx2.redhat.com [10.3.116.134]) by smtp.corp.redhat.com (Postfix) with ESMTP id C038B7D9F0; Wed, 29 Mar 2017 16:55:27 +0000 (UTC) To: Ard Biesheuvel , Jon Masters References: <20170329151940.23397-1-ard.biesheuvel@linaro.org> <7F72156F-3814-4CF1-8847-A7272409A85E@redhat.com> Cc: "edk2-devel@lists.01.org" , Marc Zyngier , Drew Jones From: Laszlo Ersek Message-ID: <52dc0685-ae37-63db-d7b5-feb49490a12d@redhat.com> Date: Wed, 29 Mar 2017 18:55:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 29 Mar 2017 16:55:29 +0000 (UTC) Subject: Re: [PATCH] ArmVirtPkg/PlatformHasAcpiDtDxe: allow manual override for DT installation X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Mar 2017 16:55:29 -0000 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit On 03/29/17 18:17, Ard Biesheuvel wrote: > On 29 March 2017 at 17:09, Jon Masters wrote: >> Thanks Laszlo. A quick note from me that regardless of this discussion I will be pushing to ensure the version Red Hat ships makes ACPI the default with it being extremely painful to use DT. It is time the ecosystem got with the program we all agreed upon and there will be no more excuses. >> > > This has *nothing* to do with the ecosystem. This has to do with > existing users of ArmVirtQemu (admittedly, a small fraction) that will > be forced to compile their UEFI images from source because we made a > backwards incompatible change. > > I am 100% on board with making ACPI and DT mutually exclusive. But I > don't believe for a second that 'everybody just exposes ACPI and DT at > the same time' if this gets merged. That's where we disagree, 100%. > That happens because people are > clueless, not because they are deliberately spending time and effort > on producing two hardware descriptions. If this were true, then the kernel's preference would have been changed to ACPI aeons ago (assuming both DT and ACPI were present). ACPI is superior to DT (cue again Grant Likely's blog post), yet kernel people resist it. That's not cluelessness. If the kernel's DT camp has any influence on platform vendors (and that's rather more a "given that" than an "if"), when they find out about this loophole, I expect them to actively recommend it as a way to perpetuate the status quo. IMO, with this patch you are eviscerating the work we've been doing in the last few weeks. Well, politics is nasty. Laszlo