From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [RFC PATCH 04/14] ACPI: Add ACPI 5.0 Time and Alarm Device driver Date: Tue, 07 Jan 2014 08:35:43 -0800 Message-ID: <52CC2CDF.3000100@zytor.com> References: <1387439515-8926-1-git-send-email-jlee@suse.com> <1387439515-8926-5-git-send-email-jlee@suse.com> <52B30F43.1060306@zytor.com> <1387518099.3539.4453.camel@linux-s257.site> <52C3647B.7000708@zytor.com> <1388998707.3539.6070.camel@linux-s257.site> <52CB929C.6050403@zytor.com> <1389091244.3539.6095.camel@linux-s257.site> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from terminus.zytor.com ([198.137.202.10]:56711 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751468AbaAGQgm (ORCPT ); Tue, 7 Jan 2014 11:36:42 -0500 In-Reply-To: <1389091244.3539.6095.camel@linux-s257.site> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: joeyli Cc: "Rafael J. Wysocki" , Alessandro Zummo , Matt Fleming , Matthew Garrett , Elliott@hp.com, samer.el-haj-mahmoud@hp.com, Oliver Neukum , werner@suse.com, trenn@suse.de, JBeulich@suse.com, linux-kernel@vger.kernel.org, rtc-linux@googlegroups.com, x86@kernel.org, "linux-efi@vger.kernel.org" , linux-acpi@vger.kernel.org On 01/07/2014 02:40 AM, joeyli wrote: > > Due to accessing CMOS through ASL need enable SMM support in OVMF, Why? The CMOS is its own ASL address space, and you need that anyway to be able to access the RTC proper. If you don't want to use it because you don't want to export any indication of a legacy RTC you should be able to just do I/O port references directly in your ASL. -hpa