Why does my Cyclone IV GX Nios II design fail to boot up in V13.1 - Why does my Cyclone IV GX Nios II design fail to boot up in V13.1 Description Due to a problem in the Quartus® II software version 13.1, Nios® II designs targeting Cyclone IV GX devices using the EPCS IP may not boot correctly. Resolution To work around this problem follow the steps below: Open /ip/altera/sopc_builder_ip/altera_avalon_epcs_flash_controller/em_epcs_qsys.pm file in a text editor Add the CYCLONEIVGX device into the condition check logic at line 703 Before: ( eq "CYCLONEIVE")) After: ( eq "CYCLONEIVE") || ( eq "CYCLONEIVGX")) This problem is fixed beggining with the Quartus software version 14.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 14.0 13.1 ['Cyclone® IV GX FPGA'] ['novalue'] ['novalue'] ['novalue']