1． 在內核中添加以下選項：
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，后面子選項可不選，配置CONFIG_NETFILTER
說明：若沒選 Packet socket, [ * ] Network packet filtering (replaces ipchains) --->選項，在執行udhcpc命令時出現如下錯誤：
~ # 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中添加以下選項：
Networking Utilities --->
udhcp Server/Client --->
[] udhcp Server (udhcpd) //在此不作服務端，故不選。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沒編譯相應選項，也可從網上下載相應文件，用arm-linux交叉編譯得到udhcpd,udhcpc命令copy到usr/sbin下就可以了。
我從 網上 下的udhcp_0.9.8cvs20050303.orig.tar.gz文件
解壓后修改Makefile文件
在19行添加CROSS_COMPILE=arm-linux-
注釋12行的COMBINED_BINARY=1，否則不生成udhcpc命令。
3． 建相關配置文件
從busybox的examples/udhcp/下copy simple.script文件到開發板/usr/share/udhcpc/下，并重命名為default.script，udhcp_0.9.8cvs20050303.orig.tar.gz中也有這樣的文件。
[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． 重啟開發板，執行udhcpc就可自動獲取IP地址了，以下是執行udhcpc的輸出信息：
~ # 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． 如果是雙網卡必須用參數指明
例：udhcpc -i eth1
===============================================
今天在我的2410上搞定攝像頭。交叉編譯gspca驅動，配置linux2.6.20.3使其支持V4L，不用選擇linux2.6自帶的ZC0301驅動。發現可以搞定，但是2410性能交叉，640＊480的VGA輸出，攝像頭分辨率大小不能設太大，否則很慢。我設定為176＊144.
今天順便上busybox.net看了看，發現穩定版已經到1.5.1，于是重新把我現在用的1.4.2換成1.5.1。
發現原來ls -l /dev出現segment fault的BUG消除了！
順便加上了dhcp client的支持。看了寫資料，方法：
在KERNEL中需要將 Packet socket和IP: DHCP support編譯進內核或編譯成模塊。在編譯Busybox時把 Networking Utilities下udhcp Server/Client中的 udhcp Client (udhcpc)選上。
關鍵點要把examples/udhcp/simple.script 腳本文件做為default.script拷貝到/usr/share/udhcpc/default.script
運行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命令下載和上傳文件,主機的ip為192.168.1.105,下載自己tftp服務器下的led.ko文件,先在主機上建立tftp服務器,在開發板上輸入下面的命令,可以將led.ko文件下載到當前目錄下。
#tftp -g -r led.ko 192.168.1.105
tftp使用說明如下:
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