From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754750AbaGPXtz (ORCPT ); Wed, 16 Jul 2014 19:49:55 -0400 Received: from terminus.zytor.com ([198.137.202.10]:47143 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754073AbaGPXtw (ORCPT ); Wed, 16 Jul 2014 19:49:52 -0400 Message-ID: <53C70F78.40206@zytor.com> Date: Wed, 16 Jul 2014 16:49:12 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: "Luck, Tony" , Hanjun Guo , "Rafael J. Wysocki" CC: Catalin Marinas , Graeme Gregory , Thomas Gleixner , "linux-acpi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linaro-acpi@lists.linaro.org" Subject: Re: [PATCH v2 1/3] ACPI: ARM64 does not have a BIOS add config for BIOS table scan. References: <1404898746-6685-1-git-send-email-hanjun.guo@linaro.org> <1404898746-6685-2-git-send-email-hanjun.guo@linaro.org> <53C70CCC.2080109@zytor.com> <3908561D78D1C84285E8C5FCA982C28F3285FB3C@ORSMSX114.amr.corp.intel.com> In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F3285FB3C@ORSMSX114.amr.corp.intel.com> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/16/2014 04:46 PM, Luck, Tony wrote: >> + select ACPI_LEGACY_TABLES_LOOKUP if ACPI > >> This shouldn't actually be set on IA64, should it? IA64 doesn't have >> BIOS, either, it has EFI/UEFI, like ARM64... > > Which ACPI tables are in the "LEGACY" category affected by this option? > That's not what this is about... it is about how you find the root pointer. On a BIOS system it is found by scanning low memory. On an EFI system it is found by querying EFI for a specific UUID. -hpa