设备型号：DELL V2420
Broadcom 网卡型号：BCM43142
lspci|grep Broadcom
07:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
1.确定自己的网卡驱动
https://lug.ustc.edu.cn/sites/opensuse-guide/wlan.php
http://www.broadcom.com/support/802.11/linux_sta.php
下载网卡驱动：hybrid-v35_64-nodebug-pcoem-6_30_223_141.tar.gz
2.解压编译网卡驱动：
解压出目录lib src和 Makefile文件，执行：
make
这样会编译报错：
/home/xxx/packages/driver/src/wl/sys/wl_cfg80211_hybrid.c:2122: error: too few arguments to function ‘cfg80211_roamed’
make[2]: *** [/home/xxx/packages/driver/src/wl/sys/wl_cfg80211_hybrid.o] Error 1
make[1]: *** [_module_/home/xxx/packages/driver] Error 2
make[1]: Leaving directory `/usr/src/kernels/2.6.32-431.el6.x86_64′
make: *** [all] Error 2
注意：添加编译参数 make API=WEXT
OK！
make API=WEXT
CC /home/xxx/packages/driver/wl.mod.o
LD [M] /home/xxx/packages/driver/wl.ko.unsigned
NO SIGN [M] /home/xxx/packages/driver/wl.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.32-431.el6.x86_64′
3.安装
# make install
install -D -m 755 wl.ko /lib/modules/`uname -r`/kernel/drivers/net/wireless
4.加载新的驱动程序
# modprobe lib80211
# insmod wl.ko
5.重新启动网络服务
# service network restart
Shutting down interface p5p1: Device state: 3 (disconnected)
[ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
参考来源，从这里看到编译参数，谢谢！：http://weiruoyu.blog.51cto.com/951650/1193257