这是驱动开发中的关键技术，如何访问内核中的内存。-This is the key technology-driven development, how to access the kernel memory.

基于linux系统的IO内存访问底层硬件的驱动程序。实验现象是LED灯亮。所以也是LED驱动程序。不是调用函数接口-IO memory based on the Linux system to access the underlying hardware driver. The experimental phenomena are LED lights. LED driver. Instead of calling the function interface