The RapidIO MegaCore Function User Guide includes instructions
to run the demonstration testbench and simulate in the Mentor Graphics
ModelSim simulator. To simulate this testbench correctly in the
ModelSim simulator, you must use the command ld-debug to
ensure that relevant information is not compiled away by the simulator. However,
those instructions erroneously specify you should use the command ld.
If you implement the instructions in the user guide without modifying the ld command, ModelSim simulation might fail and display the error message "Optimization failed. Error loading design".
To work around this issue, replace the ld command with the ld-debug command in the instructions the user guide provides to simulate the testbench in the ModelSim simulator.
This issue is fixed in version 17.0 of the RapidIO IP Core User Guide.