Re: [Qemu-devel] [PATCH v3 3/4] acpi: build TPM Physical Presence interface

[Marc-André Lureau]

Hi

On Thu, Jun 21, 2018 at 3:22 PM, Marc-André Lureau
<address@hidden> wrote:
> Hi
>
> On Thu, Jun 21, 2018 at 3:21 PM, Marc-André Lureau
> <address@hidden> wrote:
>
>>>> +    method = aml_method("TPFN", 1, AML_SERIALIZED);
>>> not quite sure how this method (supposed to ) work(s),
>>> it could use nice comment explaining mechanics.
>>>
>>
>> Windows doesn't like DerefOf (FUNC [N]), it returned wrong values. It
>> took me a while to figure this out. My laptop TPM ACPI table uses the
>> same trick, so I assume this is a Windows acpi bug/limitation. Instead
>> we use a function that returns the corresponding field.
>
> Sorry, I am wrong, my laptop doesn't use such table. I don't know
> where I saw someone using the same trick though..

fwiw, I also asked on OSR list for help but got no answer:
http://www.osronline.com/showThread.CFM?link=288617





-- 
Marc-André Lureau