此处我要实现的是将芯片的ID用于网卡MAC地址，网卡驱动是enc28j60_init。 但是，读取芯片ID的函数，在as352x_afe_init模块中，所以要先初始化as352x_afe_init。 此处，内核编译完之后，在生成的system.map中可以看到， enc28j60_init在as352x_afe_init之前，所以，无法去读芯片ID。

字符设备是 Linux 驱动中最基本的一类设备驱动，字符设备就是一个一个字节，按照字节流进行读写操作的设备，读写数据是分先后顺序的。比如我们最常见的点灯、按键、 IIC、 SPI，LCD 等等都是字符设备，这些设备的驱动就叫做字符设备驱动。 在详细的学习 ...

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