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[209.51.188.17]) by mx.google.com with ESMTPS id o18si714964qtp.110.2020.11.06.09.10.15 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 06 Nov 2020 09:10:15 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=iMtzWjoI; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:60444 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kb5Ff-0007kJ-12 for alex.bennee@linaro.org; Fri, 06 Nov 2020 12:10:15 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34248) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kb5FV-0007iQ-AY for qemu-arm@nongnu.org; Fri, 06 Nov 2020 12:10:05 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:47020) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kb5FT-00031d-1M for qemu-arm@nongnu.org; Fri, 06 Nov 2020 12:10:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604682601; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pCc2OHwduMCbNswptc9B/atjIkhqIhKb8LFY7rv/A8Q=; b=iMtzWjoIlVSlgJO84jwjDMNrBBS++NSeAt8KBsOqehHTfp2WAKHKniumV9JU6TuZs5yOD3 7uYyoZw5wgrt99b9EAlD6DENXXK2o3BpCRFiJgfSe6EB7icgZHT++mh4qIWPTEM62Boupp 2C62lGJL7VVNZod1vIwYeW+zqI7WjeQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-200-t5aAyBMzOzqdm32kVbB9uQ-1; Fri, 06 Nov 2020 12:09:58 -0500 X-MC-Unique: t5aAyBMzOzqdm32kVbB9uQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 15795101962D; Fri, 6 Nov 2020 17:09:57 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-115-95.ams2.redhat.com [10.36.115.95]) by smtp.corp.redhat.com (Postfix) with ESMTP id D39C06EF75; Fri, 6 Nov 2020 17:09:54 +0000 (UTC) Subject: Re: Question on UEFI ACPI tables setup and probing on arm64 To: Ying Fang , Igor Mammedov References: <20201103133913.1fee3337@redhat.com> <5310d14d-8dbe-ba97-fdf1-4f3f10f91f3a@huawei.com> From: Laszlo Ersek Message-ID: <813efc59-2ce4-e2be-894f-e48ca66ce603@redhat.com> Date: Fri, 6 Nov 2020 18:09:53 +0100 MIME-Version: 1.0 In-Reply-To: <5310d14d-8dbe-ba97-fdf1-4f3f10f91f3a@huawei.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=lersek@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/06 06:30:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Drew Jones , QEMU Developers , qemu-arm , "wangzhigang17@huawei.com" , "Ard Biesheuvel \(ARM address\)" , philmd@redhat.com Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: rg2+CVTC5Cui On 11/05/20 05:30, Ying Fang wrote: > I see it in Qemu the *loader_start* is fixed at 1 GiB on the > physical address space which points to the DRAM base. In ArmVirtQemu.dsc > PcdDeviceTreeInitialBaseAddress is set 0x40000000 with correspondence. > > Here I also see the discussion about DRAM base for ArmVirtQemu. > https://lists.gnu.org/archive/html/qemu-devel/2017-10/msg03127.html > > I am still not sure how UEFI knows that it is running on a ArmVirtQemu > machine type. It doesn't know. It remains a convention. This part is not auto-detected; the constants in QEMU and edk2 are independently open-coded, their values were synchronized by human effort initially. The user or the management layer have to make sure they boot a UEFI firmware binary on the machine type that is compatible with the machine type. There is some meta-data to help with that: > Does UEFI derive it from the fdt *compatible* property ? Please see the schema "docs/interop/firmware.json" in the QEMU tree; in particular the @FirmwareTarget element. For an actual example: QEMU bundles some edk2 firmware binaries (purely as a convenience, not for production), and those are accompanied by matching descriptor files. See "pc-bios/descriptors/60-edk2-aarch64.json". (It is a template that's fixed up during QEMU installation, but that's tangential here.) "targets": [ { "architecture": "aarch64", "machines": [ "virt-*" ] } ], Thanks Laszlo