Do you mean the platform library? Library/Am335xLib/AutoGen.h shows

#define _PCD_TOKEN_PcdFvBaseAddress  8U
extern const UINT32 _gPcd_FixedAtBuild_PcdFvBaseAddress;
#define _PCD_GET_MODE_32_PcdFvBaseAddress  _gPcd_FixedAtBuild_PcdFvBaseAddress
//#define _PCD_SET_MODE_32_PcdFvBaseAddress  ASSERT(FALSE)  // It is not allowed to set value for a FIXED_AT_BUILD PCD
#define _PCD_VALUE_PcdFvBaseAddress 0x80008000

If you mean the BasePcdLibNull's AutoGen.h, it does not define any PCDs (since the

.inf does not mention any PCDs)

Thanks,
Varad