1． 在内核中添加以下选项：
Networking --->
Networking support
Networking options --->
Packet socket //添加.配置CONFIG_PACKET
[ * ] IP: DHCP support //添加
[ * ] Network packet filtering (replaces ipchains) ---> //添加，后面子选项可不选，配置CONFIG_NETFILTER
说明：若没选 Packet socket, [ * ] Network packet filtering (replaces ipchains) --->选项，在执行udhcpc命令时出现如下错误：
~ # udhcpc
udhcpc (v0.9.9-pre) started
udhcpc[208]: udhcpc (v0.9.9-pre) started
FATAL: couldn't listen on socket, Address family not supported by protocol
udhcpc[208]: FATAL: couldn't listen on socket, Address family not supported by protocol
2． Busybox中添加以下选项：
Networking Utilities --->
udhcp Server/Client --->
[] udhcp Server (udhcpd) //在此不作服务端，故不选。生成udhcpd命令
udhcp Client (udhcpc) //生成udhcpc命令
[ ] Lease display utility (dumpleases)
[ ] Log udhcp messages to syslog (instead of stdout)
[ ] Compile udhcp with noisy debugging messages
若busybox没编译相应选项，也可从网上下载相应文件，用arm-linux交叉编译得到udhcpd,udhcpc命令copy到usr/sbin下就可以了。
我从 网上 下的udhcp_0.9.8cvs20050303.orig.tar.gz文件
解压后修改Makefile文件
在19行添加CROSS_COMPILE=arm-linux-
注释12行的COMBINED_BINARY=1，否则不生成udhcpc命令。
3． 建相关配置文件
从busybox的examples/udhcp/下copy simple.script文件到开发板/usr/share/udhcpc/下，并重命名为default.script，udhcp_0.9.8cvs20050303.orig.tar.gz中也有这样的文件。
[root@localhost root]# vi usr/share/udhcpc/default.script
#!/bin/sh
# udhcpc script edited by Tim Riker
[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
RESOLV_CONF="/etc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
case "$1" in
deconfig)
/sbin/ifconfig $interface 0.0.0.0
;;
renew|bound)
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
if [ -n "$router" ] ; then
echo "deleting routers"
while route del default gw 0.0.0.0 dev $interface ; do
:
done
for i in $router ; do
route add default gw $i dev $interface
done
fi
echo -n > $RESOLV_CONF
[ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
for i in $dns ; do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
done
;;
esac
exit 0
4． 重启开发板，执行udhcpc就可自动获取IP地址了，以下是执行udhcpc的输出信息：
~ # udhcpc
udhcpc (v0.9.9-pre) started
udhcpc[228]: udhcpc (v0.9.9-pre) started
Sending discover...
udhcpc[228]: Sending discover...
Sending select for 192.168.1.109...
udhcpc[228]: Sending select for 192.168.1.109...
Lease of 192.168.1.109 obtained, lease time 86400
udhcpc[228]: Lease of 192.168.1.109 obtained, lease time 86400
deleting routers
route: SIOC[ADD|DEL]RT: No such process
adding dns 192.168.0.1
~ # ping www.baidu.com
PING www.a.shifen.com (220.181.38.4): 56 data bytes
64 bytes from 220.181.38.4: icmp_seq=0 ttl=52 time=1219.0 ms
[1] + Stopped ping www.baidu.com
5． 如果是双网卡必须用参数指明
例：udhcpc -i eth1
===============================================
今天在我的2410上搞定摄像头。交叉编译gspca驱动，配置linux2.6.20.3使其支持V4L，不用选择linux2.6自带的ZC0301驱动。发现可以搞定，但是2410性能交叉，640＊480的VGA输出，摄像头分辨率大小不能设太大，否则很慢。我设定为176＊144.
今天顺便上busybox.net看了看，发现稳定版已经到1.5.1，于是重新把我现在用的1.4.2换成1.5.1。
发现原来ls -l /dev出现segment fault的BUG消除了！
顺便加上了dhcp client的支持。看了写资料，方法：
在KERNEL中需要将 Packet socket和IP: DHCP support编译进内核或编译成模块。在编译Busybox时把 Networking Utilities下udhcp Server/Client中的 udhcp Client (udhcpc)选上。
关键点要把examples/udhcp/simple.script 脚本文件做为default.script拷贝到/usr/share/udhcpc/default.script
运行udhcpc
~ # udhcpc
udhcpc (v1.5.1) started
Sending discover...
Sending select for 59.64.134.99...
Sending select for 59.64.134.99...
Sending select for 59.64.134.99...
Lease of 59.64.134.99 obtained, lease time 10800
deleting routers
route: SIOC[ADD|DEL]RT: No such process
adding dns 211.68.71.4
adding dns 211.68.71.5
adding dns 202.106.196.115
adding dns 202.106.0.20
然后可以使用tftp命令下载和上传文件,主机的ip为192.168.1.105,下载自己tftp服务器下的led.ko文件,先在主机上建立tftp服务器,在开发板上输入下面的命令,可以将led.ko文件下载到当前目录下。
#tftp -g -r led.ko 192.168.1.105
tftp使用说明如下:
Usage: tftp [OPTION]... HOST [PORT]
Transfers a file from/to a tftp server using "octet" mode.
Options:
-l FILE Local FILE
-r FILE Remote FILE
-g Get file
-p Put file
-b SIZE Transfer blocks of SIZE octets