Boot Nios II with Linux in Stratix V board


I want to build a Multi-processor system to run pthread based applications. I have Stratix V family board. So to learn about Nios II linux, I followed Nios II Linux User Manual tutorial. To configure U-Boot and Linux kernel for Nios II, we need board_config files. But the given files in the tutorial are for Cyclone III and Stratix IV. How can we create those board_config files? Anyone can help me with this please?