wifi on banana pi -- TP-LINK TL-WN725N

banana pi 的 kernel 有內建這個 module driver.
所以插入後，lsusb (package: usbutil):

Bus 002 Device 002: ID 0bda:8179 Realtek Semiconductor Corp.
...

lsmod 的話：

Module  Size   Used by
8188eu  506733 0

這時候，用 ifconfig -a 來看，已經可以看到 wlan0 這個 interface. 只是還沒啟動。
所以 follow : http://www.fars-robotics.net/ 其中，不用 wpa_supplicant (package: wpasupplicant) 的方法。
修改 /etc/network/interfaces:

auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ssid "Your-Network-Name"
wpa-psk "Your-Network-Password"

然後，用command: ifup wlan0...
就可以看到 wlan0 起來了 .. 拿到 ip 了。

---

補一下http://www.fars-robots.net 中，用 wpa_supplicant 的作法：
-- copy..

Configuring your wifi network for Raspbian Jessie.

Default /etc/network/interfaces file as supplied in the raspbian jessie image - do not edit /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

iface eth0 inet manual

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Edit the file /etc/wpa_supplicant/wpa_supplicant.conf and add the network={.....} section. Use the command sudo nano /etc/wpa_supplicant/wpa_supplicant.conf to open and edit the file. Exit the editor and save the file using keys cntl-X, Y, Enter.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="Your-Network-Name"
    psk="Your-Network-Password"
}

You may add additional network={.....} sections defining different networks if your Pi is mobile and you carry it around with you. This will allow you to connect to these other networks at various different locations without needing to change your set up.