Description
Due to a problem in the Quartus® II version 15.0 and earlier, you may see this error during elaboration of a design containing the Nios® II Gen 2 Processor. This error occurs when the instruction master has not been connected to a RAM. This means the Nios II Gen 2 Processor cannot run any software.
Resolution
To work around his problem, ensure the instruction master is connected to a RAM.
In a future release of the Quartus II software, Qsys will issue an error message during generation.