说明：  当我们想将uClinux移植到NiosII上时，需要在Linux上安裝Nios II gcc cross compiler。下载后请用RAR解压，然后方可在Linux下解压安装！！！
(When we want to migrate to NiosII on uClinux, the need to install Linux on the Nios II gcc cross compiler. Please download RAR decompression, and then only in extracting the installation under Linux! ! !)