On 12/10/2013 03:24 PM, Matthew Garrett wrote:
>>
>> TAD would also give us the timezone. I'm not sure how you can
>> realistically only use the time function during boot, however, unless
>> you inherently assume it is coherent with the hardware RTC, since you
>> wouldn't be able to set it.
>
> If we can verify that Windows actually uses TAD then I'd agree it's
> preferable to EFI, but if we can't then I wouldn't be so sure. I'll redo
> my Windows instrumentation and figure out under which circumstances it's
> calling the time functions.
>
Well, *which version* of Windows is a big question here. Keep in mind
that the TAD was only introduced with ACPI 5 so it is quite a new
feature. I would really like to see it implemented in SeaBIOS and/or
OVMF so we can test it out in Qemu.
-hpa
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