硬件平台：FL2440（s3c2440）
内核版本：2.6.35
内核版本：2.6.39
1、下图是DM9000的引脚图
2、这里我们结合具体的开发板FL2440
下面是FL2440和DM9000的引脚链接图
下面是设备的资源定义
这里可以看到，DM9000网卡使用的地址空间资源在nGCS4地址区域，所以上图的DM9000地址使能引脚连接nGCS4引脚。中断使用的是EINT7外部中断。
接着定义平台数据和平台设备，代码如下：
最后导出函数符号，保存函数地址和名称
3、设备启动的初始化过程
而后会执行下面函数
下面是具体的设备列表
这样系统启动时，会给设备列表中的设备分配资源（地址资源和中断资源等）。
4、信息传输中的信息封装结构
4.1、sk_buff结构，定义在include/linux/skbuff.h中
元素的含义如下（摘自内核,源码,版本2.6.35.4）
*struct sk_buff - socket buffer
* @next: Next buffer inlist
* @prev: Previous buffer in list
* @sk: Socketwe are owned by
* @tstamp: Time we arrived
* @dev:Device we arrived on/are leaving by
* @transport_header:Transport layer header
* @network_header: Network layerheader
* @mac_header: Link layer header
*@_skb_refdst: destination entry (with norefcount bit)
* @sp:the security path, used for xfrm
* @cb: Control buffer. Freefor use by every layer. Put private vars here
* @len: Lengthof actual data
* @data_len: Data length
* @mac_len:Length of link layer header
* @hdr_len: writable headerlength of cloned skb
* @csum: Checksum (must includestart/offset pair)
* @csum_start: Offset from skb->headwhere checksumming should start
* @csum_offset: Offset fromcsum_start where checksum should be stored
* @local_df:allow local fragmentation
* @cloned: Head may be cloned(check refcnt to be sure)
* @nohdr: Payload reference only,must not modify header
* @pkt_type: Packet class
*@fclone: skbuff clone status
* @ip_summed: Driver fed us anIP checksum
* @priority: Packet queueing priority
*@users: User count - see {datagram,tcp}.c
* @protocol:Packet protocol from driver
* @truesize: Buffer size
*@head: Head of buffer
* @data: Data head pointer
*@tail: Tail pointer
* @end: End pointer
*@destructor: Destruct function
* @mark: Generic packetmark
* @nfct: Associated connection, if any
*@ipvs_property: skbuff is owned by ipvs
* @peeked: thispacket has been seen already, so stats have been
* done forit, don't do them again
* @nf_trace: netfilter packet traceflag
* @nfctinfo: Relationship of this skb to theconnection
* @nfct_reasm: netfilter conntrack re-assemblypointer
* @nf_bridge: Saved data about a bridged frame - seebr_netfilter.c
* @skb_iif: ifindex of device we arrivedon
* @rxhash: the packet hash computed on receive
*@queue_mapping: Queue mapping for multiqueue devices
*@tc_index: Traffic control index
* @tc_verd: traffic controlverdict
* @ndisc_nodetype: router type (from link layer)
*@dma_cookie: a cookie to one of several possible DMA operations
*done by skb DMA functions
* @secmark: security marking
*@vlan_tci: vlan tag control information
4.2、net_device
关于net_device一个非常庞大的结构体，定义在/inlcude/linux/netdevice.h中
如下：
我还没有细细的分析这个结构体，驱动程序在probe函数中使用register_netdev()注册该结构体指明的设备，将内核操作硬件的函数个内核联系起来。