Re: [PATCH v2 0/3] TPM2.0: Added eventlog support for TPM2.0

[Nayna <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

Hi Jarkko,



On 08/16/2016 02:56 AM, Jarkko Sakkinen wrote:
> On Fri, Aug 12, 2016 at 06:02:00PM +0530, Nayna wrote:
>>>> Jarkko, Please let me know if it doesn't answer your question. </nayna>
>>>
>>> 1. EFI does not pass the log by any means AFAIK before a boot loader
>>>     calls ExitBootServices().
>>
>> So, is current TCPA support only for TPM1.2 ?
>
> TCPA ACPI table is only available for TPM 1.2.
>
> TPM2 ACPI table does not provide a memory ref for the event log.
>
>> #2, TCG Spec http://www.trustedcomputinggroup.org/wp-content/uploads/EFI-Protocol-Specification-rev13-160330final.pdf
>> talks about
>> EFI_TCG2_PROTOCOL.GetEventLog (Section 6.5), what is that supposed to do ?
>
> Direct quote from your reference:
>
> "Boot Service Drivers are terminated when ExitBootServices() is called
> and all memory resources consumed by the Boot Services Drivers are
> released for use in the operating system environment."

Thanks Jarkko, I understand now what you meant.
>
>>> 2. I do not have any system with TPM2 that uses DT. And as I stated
>>>     before you didn't have any reference where you derived the DT
>>>     node fields.
>>
>> As per Device Tree, so this is the new node introduced in the device tree to
>> support TPM. And the fields are defined maintaining the requirements from
>> ePAPR specification.
>
> What is ePAPR specification? Can you provide a reference?

PowerPC systems are based on device tree and derive that from ePAPR 
specification, link below for ePAPR specification..

https://www.power.org/documentation/power-org-standard-for-embedded-power-architecture-platform-requirements-epapr-v1-1-2/

I have also shared TPM2.0 device tree kernel documentation as Patch v2 2/3.

>
> /Jarkko
>


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