EDK 9.2 sp1 (EDK_Jm.16+0) does not automatically connect the SPLB_Clk port of the plbv46_opb_bridge peripheral to the attached PLB bus (PLB_Clk). The port is tied to GND, and there are no errors or warnings in PlatGen. The SPLB_Clk does not show up in the filtered PORTS list (System Assembly View).
Please connect this signal manually to PLB_CLK in the MHS.
The issue has been fixed and is available in EDK 9.2i Service Pack 2 at: