用于测试DM9000网卡，可初始化，读取ID，查看当前连接模式，CPU为2440，晶振12M，DM9000片选CS3，中断9,DM9000 network card for testing, can be initialized, read ID, view the current connection mode, CPU for 2440, crystal 12M, DM9000 chip select CS3, interrupt 9