开发板：荔枝派zero
linux：5.10
rootfs：buildroot 2017.8.1
使用最新的主线linux内核5.10，主线5.10内核linux
make ARCH=arm licheepi_zero_defconfig
默认打开了8723BS编译为模块且只能编译成模块 因为要加载固件到8723内部
编译后的驱动在drivers/staging/rtl8723bs目录下，把r8723bs.ko和rtl8723bs_nic.bin拷到TF卡的BOOT分区，等会要把rtl8723bs_nic.bin放到/lib/firmware/rtlwifi目录下
buildroot中打开wireless tools 和wpa_supplicant
安装模块
insmod r8723bs.ko
正常会出现
# insmod r8723bs.ko
[ 41.913611] r8723bs: module is from the staging directory, the quality is unknown, you have been warned.
[ 41.940102] RTL8723BS: module init start
[ 41.944058] RTL8723BS: rtl8723bs v4.3.5.5_12290.20140916_BTCOEX20140507-4E40
[ 41.951244] RTL8723BS: rtl8723bs BT-Coex version = BTCOEX20140507-4E40
[ 41.959077] pnetdev = bbff7945
[ 42.114968] RTL8723BS: rtw_ndev_init(wlan0)
[ 42.120728] RTL8723BS: module init ret =0
然后把bin文件拷到相应目录下，原始的buildroot是没有这个文件的
cp rtl8723bs_nic.bin /lib/firmware/rtlwifi/
然后打开wlan0
ifconfig wlan0 up
出现
rtl8723bs: acquire FW from file:rtlwifi/rtl8723bs_nic.bin
输入ifconfig就能看到有wlan0了
# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 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)
wlan0 Link encap:Ethernet HWaddr 84:20:96:AB:35:86
UP 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)
配置连接WiFi
编辑vi /etc/network/interfaces文件
# Configure Loopback
auto lo
iface lo inet loopback
# wlan0
auto wlan0
iface wlan0 inet dhcp
wpa_supplicant连接WIFI的时候会从配置文件中读取账号和密码，以及加密方式等， 所以我们再运行wpa_supplicant工具的时候要提前写好配置文件。
配置文件名称自定，但是要以 .conf 为后缀，并保存在 /etc/ 目录下，这边给出一个配置文件的例子。
编辑vi /etc/wpa_supplicant.conf 文件:
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1
network={
ssid="KKKK"
scan_ssid=1
key_mgmt=WPA-EAP WPA-PSK IEEE8021X NONE
pairwise=TKIP CCMP
group=CCMP TKIP WEP104 WEP40
psk="99999999"
priority=5
}
创建一个socket通信的目录
mkdir -p /var/run/wpa_supplicant
连接WiFi
wpa_supplicant -B -c /etc/wpa_supplicant.conf -i wlan0
出现以下正常
# vi /etc/network/interfaces
# vi /etc/wpa_supplicant.conf
# mkdir -p /var/run/wpa_supplicant
# wpa_supplicant -B -c /etc/wpa_supplicant.conf -i wlan0
Successfully initialized wpa_supplicant
rfkill: Cannot open RFKILL control device
# [ 263.533205] RTL8723BS: rtw_set_802_11_connect(wlan0) fw_state = 0x00000008
[ 263.837861] RTL8723BS: start auth
[ 263.843508] RTL8723BS: auth success, start assoc
[ 263.852424] RTL8723BS: rtw_cfg80211_indicate_connect(wlan0) BSS not found !!
[ 263.859594] RTL8723BS: assoc success
[ 263.869354] RTL8723BS: send eapol packet
[ 263.881070] RTL8723BS: send eapol packet
[ 263.886245] RTL8723BS: set pairwise key camid:4, addr:fa:12:65:54:24:c9, kid:0, type:AES
[ 263.897246] RTL8723BS: set group key camid:5, addr:fa:12:65:54:24:c9, kid:2, type:AES
获取IP地址
# udhcpc -i wlan0
udhcpc: started, v1.27.2
udhcpc: sending discover
udhcpc: sending select for 192.168.137.115
udhcpc: lease of 192.168.137.115 obtained, lease time 604800
deleting routers
adding dns 192.168.137.1
查看网络状态
# wpa_cli -iwlan0 status
bssid=fa:12:65:54:24:c9
freq=2462
ssid=KKKK
id=0
mode=station
pairwise_cipher=CCMP
group_cipher=CCMP
key_mgmt=WPA2-PSK
wpa_state=COMPLETED
ip_address=192.168.137.115
address=84:20:96:ab:35:86
uuid=184c11e5-9a89-5b14-8be3-a53e89785949
ping 看下网络通不通
# ping www.baidu.com
PING www.baidu.com (183.232.231.172): 56 data bytes
64 bytes from 183.232.231.172: seq=0 ttl=56 time=12.049 ms
64 bytes from 183.232.231.172: seq=1 ttl=56 time=28.945 ms
64 bytes from 183.232.231.172: seq=2 ttl=56 time=11.020 ms
64 bytes from 183.232.231.172: seq=3 ttl=56 time=58.708 ms
64 bytes from 183.232.231.172: seq=4 ttl=56 time=11.982 ms
64 bytes from 183.232.231.172: seq=5 ttl=56 time=26.644 ms
最后设置开机启动
新建一个rc.local文件到/etv/init.d目录下
!/bin/sh
sh /etc/init.d/auto_wifi_link.sh
echo "wifi finish!!"
创建脚本auto_wifi_link.sh放到/etc/init.d/目录下
#!/bin/sh
insmod /r8723bs.ko
ifconfig wlan0 up
wpa_supplicant -B -c /etc/wpa_supplicant.conf -i wlan0
sleep 3s
udhcpc -i wlan0
修改开机启动项 vi /etc/inittab
# now run any rc scripts 后加入如下
::sysinit:/etc/init.d/rc.local
修改rc.local 权限
# chmod 755 /etc/init.d/rc.local
rc.local就能够正常工作了。
reboot重启看到自动导入驱动然后连接wifi得到ip地址
