说明：  cs8900网卡在嵌入式系统中的驱动,网上很少有此网卡驱动的源代码,并且cs8900的datasheet写的非常乱,这个网卡驱动是我用了快2个星期弄出来的,分享给大家,希望大家少走弯路.
(CS8900 card in embedded system drive, on-line rarely have this card-driven source code, and CS8900 to write the datasheet very chaotic, the network card driver is I used the faster it comes out two weeks, and share with everyone, I hope U.S. small detours.)