开发板4412_ARM9开发，通过使用miscdevice驱动框架构建设备结点，开发测试gpio和key驱动测试，测试使用ioctl函数调用实现，里面猪油详细注释；-Development board 4412 ARM9 development, through the use of miscdevice driver framework to build device nodes, development and testing gpio key drive test, the use of