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交叉编译器：arm-linux-gcc-4.5.4
Linux内核版本：Linux-3.0
开发板：FL2440
本文章的内核已经已经添加了DM9000的网卡，USB驱动，使用的是initramfs的文件系统。
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便于理解，在这里把rt3070 sta模式一直的大体步骤说一下：添加内核支持-->编译Wireless tools生成一些库函数放到开发板的/lib/下-->编译Openssl生成一些库函数（一是放在开发板的/lib/目录下用作开发板移植所需，二是wpa_supplicant编译所需）-->编译wpa_supplicant生成命令文件(wpa_passphrase、wpa_supplicant、wpa_cli)-->开发板配置sta模式：wpa_passphrase生成配置文件，wpa_supplicant命令执行配置文件。
一、添加内核：
Linux-3.0以上的版本中，rt3070的驱动已经加入了内核源码中去了，本篇用的是Linux-3.0的内核，只需要在内核的make menuconfig中选择支持rt3070的station模式就可以了。
修改如下：
[*] Networking support --->
-*- Wireless --->
<*> cfg80211 - wireless configuration API
[*] enable powersave by default
<*> Common routines for IEEE802.11 drivers
<*> Generic IEEE 802.11 Networking Stack (mac80211)
[*] Minstrel
[*] Minstrel 802.11n support
Default rate control algorithm (Minstrel) --->
Device Drivers --->
Generic Driver Options --->
-*- Userspace firmware loading support
[*] Include in-kernel firmware blobs in kernel binary
[*] Network device support --->
[*] Wireless LAN --->
<*> Ralink driver support --->
--- Ralink driver support
<*> Ralink rt27xx/rt28xx/rt30xx (USB) support
[*] Ralink debug output
编译内核烧录到开发板并插上rt3070模块显示如下：
usb 1-1.1: new full speed USB device number 4 using s3c2410-ohci
usb 1-1.1: New USB device found, idVendor=148f, idProduct=3070
usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.1: Product: 802.11 n WLAN
usb 1-1.1: Manufacturer: Ralink
phy1 -> rt2x00_set_chip: Info - Chipset detected - rt: 3070, rf: 0005, rev: 0201.
>: lsusb
Bus 001 Device 001: ID 1d6b:0001
Bus 001 Device 002: ID 05e3:0606
Bus 001 Device 004: ID 148f:3070
>: ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:A1:B0:40:6F:9A
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
如果想要启动wlan0还需要一个rt2870的固件。下载地址：
git clone git://git.kernel.org/pub/scm/linux/kernel/git/dwmw2/linux-firmware.git
在开发板下创建/lib/firmware文件夹，将下载下来的linux-firmware/rt2870.bin拷贝到开发板的firmware文件夹下。
二、无线网络配置工具移植
wireless_tools.29.tar.gz 下载地址http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/wireless_tools.29
openssl-0.9.8i.tar.gz 下载地址http://www.openssl.org/source/openssl-0.9.8i
wpa_supplicant-0.7.3.tar.gz 下载地址http://hostap.epitest.fi/releases/wpa_supplicant-0.7.3
（1）wireless_tools的配置：
[xiaohexiansheng@centos6 test]$ tar xzvf wireless_tools.29.tar.gz
[xiaohexiansheng@centos6 test]$ cd wireless_tools.29
[xiaohexiansheng@centos6 wireless_tools.29]$ vim Makefile
修改如下：
CC =/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc
AR = /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ar
RANLIB =/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ranlib
[xiaohexiansheng@centos6 wireless_tools.29]$ make
这时可以在当前目录下找到生成的文件：iwlist iwconfig iwpriv libiw.so.29 把文件分别拷贝到开发板的/lib/ /bin/目录下，并修改权限为可执行文件：
（2）openssl的配置
因为wpa_supplicant的编译需要openssl编译出来的库文件，所以这里需要首先编译openssl。
[xiaohexiansheng@centos6 rt3070]$ tar -xzf openssl-0.9.8i.tar.gz
[xiaohexiansheng@centos6 rt3070]$ cd openssl-0.9.8i
[xiaohexiansheng@centos6 openssl-0.9.8i]$ mkdir install
[xiaohexiansheng@centos6 openssl-0.9.8i]$ vim Makefile
修改如下：
INSTALLTOP=/home/xiaohexiansheng/fl2440/3rdparty/rt3070/openssl-0.9.8i/install
OPENSSLDIR=/home/xiaohexiansheng/fl2440/3rdparty/rt3070/openssl-0.9.8i/install
CC= /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc
AR= /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ar $(ARFLAGS) r
RANLIB= /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-ranlib
[xiaohexiansheng@centos6 openssl-0.9.8i]$ sudo make
[xiaohexiansheng@centos6 openssl-0.9.8i]$ sudo make install
[xiaohexiansheng@centos6 openssl-0.9.8i]$ ls install/lib/
engines libcrypto.a libssl.a pkgconfig
将libcrypto.a libssl.a拷贝到开发板的/lib/目录下
（3）wpa_supplicant配置
[xiaohexiansheng@centos6 rt3070]$ tar -xzf wpa_supplicant-0.7.3.tar.gz
[xiaohexiansheng@centos6 rt3070]$ cd wpa_supplicant-0.7.3
[xiaohexiansheng@centos6 wpa_supplicant-0.7.3]$ ls
COPYING patches README src wpa_supplicant
[xiaohexiansheng@centos6 wpa_supplicant-0.7.3]$ cd wpa_supplicant/
[xiaohexiansheng@centos6 wpa_supplicant]$ cp defconfig .config
[xiaohexiansheng@centos6 wpa_supplicant]$ vim .config
修改如下：
CC= /opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc -L/home/guanlei/fl2440/3rdparty/rt3070/openssl-0.9.8i/install/lib
CFLAGS += -I/home/xiaohexiansheng/fl2440/3rdparty/rt3070/openssl-0.9.8i/install/include
LIBS += -L/home/xiaohexiansheng/fl2440/3rdparty/rt3070/openssl-0.9.8i/install/lib
[xiaohexiansheng@centos6 wpa_supplicant]$ make
生成的文件中我们所需要的文件有：wpa_passphrase wpa_supplicant wpa_cli
三、开发板文件配置
理一下所需要的文件及所在的位置：
/lib/:iwlist iwconfig iwpriv libiw.so.29 libcrypto.a libssl.a
/bin/:iwlist iwconfig iwpriv libiw.so.29
wpa_supplicant下生成的wpa_passphrase wpa_supplicant wpa_cli这三个文件是命令文件。
wpa_passphrase用来生成wpa_supplicant.conf的配置文件：
>: ./wpa_passphrase ssid psk >> wpa_supplicant.conf (ssid就是wifi名字 psk是密码)
这时生成的.conf文件还不能用，需要修改一下，最终的文件是这种形式：
# WPA-PSK/TKIP
# wpa_supplicant -Dwext -iwlan0 -c/apps/etc/wireless/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
network={
ssid="ssid"
key_mgmt=WPA-PSK // 加密模式 这里一定要和的你要连的wifi保持一致
proto=WPA
pairwise=TKIP CCMP
#psk="psk"
psk=a9a3f0b958b887804e71fe58694f82b5972dfc658827a366d6eea0c8abe9a42e
}
>: ./wpa_supplicant -Dwext -iwlan0 -c/apps/etc/wireless/wpa_supplicant.conf &
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 102.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 4, CWmax: 5, Aifs: 2, TXop: 188.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 5, CWmax: 10, Aifs: 3, TXop: 0.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 5, CWmax: 10, Aifs: 7, TXop: 0.
Trying to associate with d4:ee:07:22:6b:5c (SSID='HiWiFi_LingYun' freq=2427 MHz)
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 2 - CWmin: 7, CWmax: 10, Aifs: 3, TXop: 0.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 3 - CWmin: 4, CWmax: 10, Aifs: 7, TXop: 0.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 1 - CWmin: 3, CWmax: 4, Aifs: 2, TXop: 94.
phy1 -> rt2x00mac_conf_tx: Info - Configured TX queue 0 - CWmin: 2, CWmax: 3, Aifs: 2, TXop: 47.
Associated with d4:ee:07:22:6b:5c
WPA: Key negotiation completed with d4:ee:07:22:6b:5c [PTK=CCMP GTK=CCMP]
CTRL-EVENT-CONNECTED - Connection to d4:ee:07:22:6b:5c completed (auth) [id=0 id_str=]
>: ./iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"HiWiFi_LingYun"
Mode:Managed Frequency:2.427 GHz Access Point: D4:EE:07:22:6B:5C
Bit Rate=60 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=53/70 Signal level=-57 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:1 Missed beacon:0
>: ifconfig wlan0 192.168.199.234 up
>: ping 192.168.199.1
PING 192.168.199.1 (192.168.199.1): 56 data bytes
64 bytes from 192.168.199.1: seq=0 ttl=64 time=59.740 ms
64 bytes from 192.168.199.1: seq=1 ttl=64 time=46.335 ms
64 bytes from 192.168.199.1: seq=2 ttl=64 time=49.224 ms
--- 192.168.199.1 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 46.335/51.766/59.740 ms
好了，这时开发板就可以通过rt3070这个模块来连接路由器了。
四、登陆外网
>: ifconfig wlan0 192.168.199.234 netmask 255.255.255.0 up
>: ifconfig eth0 down
>: ifconfig
wlan0 Link encap:Ethernet HWaddr 00:A1:B0:40:6F:9A
inet addr:192.168.199.234 Bcast:192.168.199.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:690 errors:0 dropped:170 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:63943 (62.4 KiB) TX bytes:901 (901.0 B)
添加resolv.conf来进行域名解析：
>: vi /etc/resolv.conf
earch localdomain
nameserver 4.2.2.2
nameserver 8.8.8.8
>: ping www.baidu.com
PING www.baidu.com (119.75.218.70): 56 data bytes
64 bytes from 119.75.218.70: seq=0 ttl=53 time=24.430 ms
64 bytes from 119.75.218.70: seq=1 ttl=53 time=66.255 ms