Hi Liming,<br /><br />I have drafted a short update note below. This is my first time doing it, please let me know if you have any feedbacks:<br />
<ul>
<li>VariableSmmRuntimeDxe.inf depends on library class MmUnblockMemoryLib. Platforms supporting variable service through SMM should configure platform DSC in [LibraryClasses]<br />```MmUnblockMemoryLib|MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf```</li>
<li>Tcg2Smm is split into 2 drivers: Tcg2Smm and Tcg2Acpi. Platforms supporting TCG2 Physical Presence and Memory Clear through ACPI method should add a new entry in [Components] section of platform DSC as well as the corresponding FV section in platform FDF<br />```SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.inf```</li>
</ul>
I will work on updating edk2-platform in that regards shortly.<br /><br />Thanks,<br />Kun