Hi Ray,
It's been a while.
This change is really not that complicated. Can it be merged if there
are no substantial opens?
Regards,
Michael
On 8/12/2021 10:16 PM, Michael Kubacki wrote:
Sure.
Scenario #1:
MinPlatformPkg/PlatformInit/PlatformInitPei/PlatformInitPreMem.inf and
MinPlatormPkg/PlatformInit/PlatformInitPei/PlatformInitPostMem.inf both
link against an instance of BoardInitLib.
Many boards link against a single BoardInitLib instance. See example -
https://github.com/tianocore/edk2-platforms/blob/cd4e6b716c7d1bcde94035e7dce14b53a553e103/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkg.dsc#L203
That BoardInitLib instance may link against SmmAccessLib.
PlatformInitPreMem may wish to library class override the SmmAccessLib
to the NULL instance while keeping it to non-NULL instance in
PlatformInitPostMem.
Scenario #2:
A PEIM is built that checks whether the boot mode is S3. If so, it calls
PeiInstallSmmAccessPpi(). A particular platform does not support S3,
therefore, it links BaseSmmAccessLibNull as its library instance for
SmmAccessLib.
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