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

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Date:	Thu, 09 Jan 2014 11:47:39 +0800
From:	joeyli <jlee@...e.com>
To:	"H. Peter Anvin" <hpa@...or.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

於 三，2014-01-08 於 09:56 -0800，H. Peter Anvin 提到：
[...]
> > Document of Windows XP:
> >
> http://www.freelists.org/post/windows_errors/what-error-messages-really-mean-WinXP-IO-Ports-Blocked-from-Bios-AML-on-Windows-XP
> > 
> > If just for ACPI TAD testing, we can remove the port protection
> check of
> > RTC ports in hwvalid.c. I have read 0x70/0x71 port success after
> removed
> > the checking in acpica/hwvalid.c.
> > 
> > I will try to write RTC port in AML after remove acpica check, maybe
> > have other unpredictable situation.
> > 
> 
> Now *THERE* is a good use of the "no RTC bit".  In the case that bit
> is
> set we should presumably remove these ports from the block list.

Thanks for your suggestion, I will put a testing patch on this.

> 
> Otherwise we should use the CMOS address space, not the I/O port
> address
> space.
> 
>         -hpa 

Unfortunately current acpica leaks the SystemCMOS handler:

ACPI Error: Region SystemCMOS (ID=5) has no handler (20131115/exfldio-299)


Regards
Joey Lee


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