Help: about the socp setting

You specify the reset, exception, and break addresses under the CPU settings tab in SOPC builder. If you are starting a new project I recommend sticking to the normal HAL flow (i.e. not the legacy sdk). For your FIFOs you can create a HAL driver or simply do direct accesses via your software. If you do direct access (reading and write from fixed addresses) and you use a Nios core with data cache ('f' core) make sure you bypass the cache when accessing any peripheral. I recommend going to the Altera site and reading the software and hardware handbooks for the Nios II processor since you will find detailed infomation there (including tutorials to help you build up a system).