说明：  介绍嵌入式Linux系统的移植，内容涵盖环境的搭建，交叉编译器的生产，u-boot的移植，linux内核的移植，驱动移植
(Embedded Linux system introduced transplantation, the structure covers the environment, the production cross-compiler, u-boot transplant, linux kernel transplantation, graft drive)