在开发nios2时，当把nios2中写的程序烧录到用epcs4中时会报错，原因是找不到epcs的映射资料，把这个文件，放到quartus根目录的bin文件夹内后，再打开一次flash program，就能下载成功！,Nios2 in the development, when the procedures wrote nios2 writers to use when epcs4 in error, the use of this document, into the root directory quartus the bin folder, you can download success!