Hello,
I was building the IpmifeaturePkg from the OutOfBandManagementPkg in edk2-platforms and saw the the components were not working in Run-time. I checkout out the instances in the edk2-platforms/Features/Intel/OutOfBandManagement/IpmiFeaturePkg/Include/IpmiFeature.dsc and realized that this instance was used for all modules using IpmiLib:

IpmiLib|MdeModulePkg/Library/BaseIpmiLibNull/BaseIpmiLibNull.inf

which meant all the the drivers using the IpmiSubmitCommand routine would simply calling a NULL routine.
shouldn't it be like this?:

[LibraryClasses.common.PEI_CORE,LibraryClasses.common.PEIM]
...
IpmiLib|MdeModulePkg/Library/PeiIpmiLibIpmiPpi/PeiIpmiLibIpmiPpi.inf

[LibraryClasses.common.DXE_DRIVER,LibraryClasses.common.UEFI_DRIVER]
... IpmiLib|MdeModulePkg/Library/DxeIpmiLibIpmiProtocol/DxeIpmiLibIpmiProtocol.inf

[LibraryClasses.common.DXE_SMM_DRIVER]

...
IpmiLib|MdeModulePkg/Library/SmmIpmiLibSmmIpmiProtocol/SmmIpmiLibSmmIpmiProtocol.inf

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