标签（空格分隔）： device_tree
http://blog.csdn.net/lichengtongxiazai/article/category/2126587 http://21cnbao.blog.51cto.com/109393/1105647 http://www.embedu.org/Column/7506.html http://www.right.com.cn/forum/thread-146260-1-1.html 写的好
