Subject: Re: [RFC PATCH 04/14] ACPI: Add ACPI 5.0 Time and Alarm Device
 driver
From: joeyli <jlee@suse.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Alessandro Zummo <a.zummo@towertech.it>,
        Matt Fleming <matt@console-pimps.org>,
        Matthew Garrett <matthew.garrett@nebula.com>, Elliott@hp.com,
        samer.el-haj-mahmoud@hp.com, Oliver Neukum <oneukum@suse.de>,
        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-efi@vger.kernel.org>,
        linux-acpi@vger.kernel.org
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Date: Thu, 09 Jan 2014 11:47:39 +0800
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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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