On 08/14/19 16:00, Gao, Liming wrote:
> Laszlo:

> 
> I cherry pick this patch from Mu project with the minimal change. 
> I can update the comment style. 

Yes, please. Thanks!

>> The gEfiMemoryTypeInformationGuid HOB is supposed to be built -- if it
>> is built at all -- no later than in the DXE IPL PEIM (if VariablePei is
>> included in the platform, and the underlying UEFI variable exists). Is
>> that correct?
>>
> gEfiMemoryTypeInformationGuid HOB is installed by platform PEI. 

Yes, that's what I meant by "no later than in the DXE IPL PEIM".

> If the platform PEI doesn't install this HOB, it means this feature is 
> disabled. 

PlatformPei is supposed to build the HOB in the first place, yes.

However, if it doesn't, then there still may be a feedback loop between
the DXE IPL PEIM and BDS. The former builds the HOB from the UEFI
variable, and the latter updates the variable (as I understand) for
future boots.

Thanks
Laszlo

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