The continuous improvement in development of Linux for the Embedded system makes it secure, table and reliable. Embedded Linux plays an important role in the embedded field. Linux has been widely used in embedded system due to its small size kernel, stable performance, versatility and low prize. This paper describes the transplantation of the Linux operating system as well as implementation of CMOS device driver based on the mini2440 development board. The transplantation of Embedded Linux includes the development of cross compile environment, the compilation of boot-loader, porting of Linux kernel and the construction of root file system. The SCCB bus, camera interface and V4L2 structure are included in development of CMOS camera device driver for the mini 2440 board.