linux-kernel - Re: [RFC PATCH 04/14] ACPI: Add ACPI 5.0 Time and Alarm Device driver

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Message-ID: <52CC2CDF.3000100@zytor.com>
Date:	Tue, 07 Jan 2014 08:35:43 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	joeyli <jlee@...e.com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <matthew.garrett@...ula.com>, Elliott@...com,
	samer.el-haj-mahmoud@...com, Oliver Neukum <oneukum@...e.de>,
	werner@...e.com, trenn@...e.de, JBeulich@...e.com,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	x86@...nel.org,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [RFC PATCH 04/14] ACPI: Add ACPI 5.0 Time and Alarm Device driver

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

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