实验环境

主板：JZ2440
编译器：arm-linux-gcc version 4.3.2 (Sourcery G++ Lite 2008q3-72)
Linux Kernel：3.4.2
DHCP版本：dhcp-4.2.5-P1.tar.gz
无线网卡：Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter

交叉编译

解压

tar xzf dhcp-4.2.5-P1.tar.gz
cd dhcp-4.2.5-P1

配置

./configure --host=arm-linux ac_cv_file__dev_random=yes

修改 bind 文件夹中文件

cd bind
vim Makefile

把第 55 行：

./configure --disable-kqueue

改为

./configure BUILD_CC=gcc ac_cv_file__dev_random=yes --host=arm-linux --disable-kqueue

解压 bind 文件夹下 bind.tar.gz

tar xzf bind.tar.gz
cd bind-9.8.4-P2

修改 lib/export/dns/Makefile.in

vim lib/export/dns/Makefile.in

将第 168 和 169 行：

168 gen: ${srcdir}/gen.c
169         ${CC} ${ALL_CFLAGS} ${LDFLAGS} -o $@ ${srcdir}/gen.c ${LIBS}

改为：

gen: ${srcdir}/gen.c
        ${BUILD_CC} ${ALL_CFLAGS} ${LDFLAGS} -o $@ ${srcdir}/gen.c ${LIBS}

编译

cd ../..
make
mkdir tmp
make DESTDIR=$PWD/tmp install

使用 DHCP

将编译出来的程序和文件拷贝到根文件系统

cd tmp/usr/local/
# XHR ROOTFS 为我的 NFS 根文件系统路径
export XHRROOTFS=/nfsroot/rootfs-1.20.0
cp bin/* $XHRROOTFS/bin/
cp sbin/* $XHRROOTFS/sbin/
cp etc/dhclient.conf.example $XHRROOTFS/etc/dhclient.conf
cp etc/dhcpd.conf.example $XHRROOTFS/etc/dhcpd.conf

拷贝并修改执行脚本

cd ../../..
cp client/scripts/linux $XHRROOTFS/etc/dhclient-script
vim $XHRROOTFS/etc/dhclient-script
    {
        将第一行
        #!/bin/bash
        改为
        #!/bin/sh
    }

使用
在开发板上：

mkdir -p /var/db
#wpa_supplicant -B -d -Dnl80211 -iwlan0 -c/etc/wpa-wpa2.conf
#wpa_supplicant -B -d -iwlan0 -c/etc/wpa-wpa2.conf
wpa_supplicant -B -iwlan0 -c/etc/wpa-wpa2.conf
wpa_cli -iwlan0 status

使用 wpa_cli -iwlan0 status 查看状态，显示 COMPLETED：

/ # wpa_cli -iwlan0 status
bssid=94:0e:6b:f5:0f:81
ssid=Honor V9   # 热点名称
id=0
mode=station
pairwise_cipher=CCMP
group_cipher=CCMP
key_mgmt=WPA2-PSK     # 加密方式
wpa_state=COMPLETED   # 链接热点成功
address=70:f1:1c:27:dd:3a

使用 dhcp 自动分配 ip

/sbin/dhclient wlan0

再使用 ifconfig 查看 wlan0 的 IP，192.168.43.1 是手机IP。

eth0      Link encap:Ethernet  HWaddr 00:60:6E:33:44:55  
          inet addr:192.168.0.231  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7777 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3326 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:9705696 (9.2 MiB)  TX bytes:537300 (524.7 KiB)
          Interrupt:51 Base address:0x4000 


wlan0     Link encap:Ethernet  HWaddr 70:F1:1C:27:DD:3A  
          inet addr:192.168.43.234  Bcast:192.168.43.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:1 overruns:0 frame:0
          TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2294 (2.2 KiB)  TX bytes:1960 (1.9 KiB)

ping 测试

ping 192.168.43.1                                                                                                       
PING 192.168.43.1 (192.168.43.1): 56 data bytes
64 bytes from 192.168.43.1: seq=0 ttl=64 time=51.363 ms
64 bytes from 192.168.43.1: seq=1 ttl=64 time=49.740 ms
64 bytes from 192.168.43.1: seq=2 ttl=64 time=58.300 ms
64 bytes from 192.168.43.1: seq=3 ttl=64 time=51.565 ms