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Subject: Re: [PATCH 1/3] rtc-efi: register rtc-efi device when EFI enabled
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Fri, 28 Dec 2012 21:19:21 -0800
To: Matthew Garrett <matthew.garrett@nebula.com>
CC: "Lee, Chun-Yi" <joeyli.kernel@gmail.com>,
        "matt.fleming@intel.com" <matt.fleming@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
        "Lee, Chun-Yi" <jlee@suse.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Jan Beulich <JBeulich@suse.com>,
        Len Brown <lenb@kernel.org>, Arjan van de Ven <arjan@infradead.org>
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Again, we could hack a simulator and try it.

Matthew Garrett <matthew.garrett@nebula.com> wrote:

>On Fri, 2012-12-28 at 16:42 -0800, H. Peter Anvin wrote:
>> On 12/28/2012 03:39 PM, Matthew Garrett wrote:
>> > On Fri, 2012-12-28 at 15:32 -0800, H. Peter Anvin wrote:
>> >> No, that is explicitly the ordering that is excludable.
>> > 
>> > Windows uses the UEFI time functions. The fact that they fail for
>us on
>> > a bunch of systems is just another symptom of our general failure
>to
>> > accurately mimic Windows when making runtime calls, and we should
>just
>> > make sure that that gets fixed rather than layering more
>workarounds on
>> > top. It's an embarrassment that we're still unable to deal with
>> > platforms that work fine with another OS. 
>> > 
>> 
>> Are they using them in preference to ACPI?  This seems a bit odd,
>since
>> one can presume that the ACPI functions were added at Microsoft's
>request...
>
>In preference to the ACPI RTC, I haven't yet had an ACPI 5.0 TAD device
>to test in comparison.

-- 
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