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Using BUFFALO WI-U2-433DM on Raspberry Pi 2 (self-compiling) †
This article explains how to connect WI-U2-433DM (Air Station 11ac/n/a/g/b 433/150Mbps USB 2.0 support Wireless LAN dongle) with Raspberry Pi 2 and how to use it on Raspbian.
To flow the directions described in Raspberry Pi 2 kernel self-compile, complete kernel compile and boot from the new kernel, and build the driver for WI-U2-433DM.
Obtaining source †
Linux drivers for Realtek 8812au, which is used at WI-U2-433DM, is released from Realtek, posted at github and maintained by volunteers. Please use a driver, which supports Raspberry Pi and is arranged with a newer version of kernel.
To do git clone, please obtain the source code of the driver.
pi@raspberrypi ~ $ cd src/
pi@raspberrypi ~/src $ git clone https://github.com/abperiasamy/rtl8812AU_8821AU_linux.git
Cloning into 'rtl8812AU_8821AU_linux'...
remote: Counting objects: 797, done.
remote: Total 797 (delta 0), reused 0 (delta 0), pack-reused 797
Receiving objects: 100% (797/797), 1.98 MiB | 846.00 KiB/s, done.
Resolving deltas: 100% (430/430), done.
Checking connectivity... done.
Adjusting Makefile †
Change the build option on Makefile for Raspberry Pi.
pi@raspberrypi ~/src $ cd rtl8812AU_8821AU_linux/
beat@raspberrypi ~/src/rtl8812AU_8821AU_linux $ vim Makefile
At Line 52, change CONFIG_PLATFORM_I386_PC = y to CONFIG_PLATFORM_I386_PC = n
At Line 58, change CONFIG_PLATFORM_ARM_RPI = n to CONFIG_PLATFORM_ARM_RPI = y
Build †
Please execute Make.
pi@raspberrypi ~/src/rtl8812AU_8821AU_linux $ time make 2>&1 | tee make.log
make ARCH=arm CROSS_COMPILE= -C /lib/modules/4.1.10-v7+/build M=/home/pi/src/rtl8812AU_8821AU_linux modules
make[1]: Entering directory '/usr/src/linux'
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_cmd.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_security.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_debug.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_io.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_ioctl_query.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_ioctl_set.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_ieee80211.o
~~ Skipping ~~
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/hal/OUTSRC/rtl8821a/HalHWImg8821A_TestChip_BB.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/hal/OUTSRC/rtl8821a/HalHWImg8821A_TestChip_RF.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/hal/OUTSRC/rtl8821a/HalPhyRf_8821A.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/hal/OUTSRC/rtl8821a/odm_RegConfig8821A.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_mp.o
CC [M] /home/pi/src/rtl8812AU_8821AU_linux/core/rtw_mp_ioctl.o
LD [M] /home/pi/src/rtl8812AU_8821AU_linux/8812au.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/pi/src/rtl8812AU_8821AU_linux/8812au.mod.o
LD [M] /home/pi/src/rtl8812AU_8821AU_linux/8812au.ko
make[1]: Leaving directory '/usr/src/linux'
real 5m18.419s
user 4m55.650s
sys 0m16.600s
It takes 5 minutes approximately.
The size of 8812au.ko is 1.3M. (The size is less than one tenth of mt7650u_sta.ko.)
pi@raspberrypi ~/src/rtl8812AU_8821AU_linux $ ls -alh 8812au.ko
-rw-r--r-- 1 pi pi 1.3M Nov 5 21:03 8812au.ko
Install †
Please apply the command line of make install to install the kernel module.
pi@raspberrypi ~/src/rtl8812AU_8821AU_linux $ sudo make install
install -p -m 644 8812au.ko /lib/modules/4.1.10-v7+/kernel/drivers/net/wireless/
/sbin/depmod -a 4.1.10-v7+
Confirmation of load †
The kernel module has been installed. As WI-U2-433DM is inserted to Raspberry Pi 2, 8812au.ko is loaded and the network interface, wlan*, is created.
root@raspberrypi:~# lsmod
Module Size Used by
8812au 960539 0
cfg80211 410393 1 8812au
rfkill 15913 1 cfg80211
bcm2835_gpiomem 2860 0
uio_pdrv_genirq 2924 0
uio 7784 1 uio_pdrv_genirq
i2c_dev 5610 0
snd_bcm2835 19808 3
snd_pcm 73405 1 snd_bcm2835
snd_timer 17657 1 snd_pcm
snd 50337 9 snd_bcm2835,snd_timer,snd_pcm
fuse 79934 3
ipv6 336324 32
oot@raspberrypi:~# iwconfig
wlan0 unassociated Nickname:"<WIFI@REALTEK>"
Mode:Auto Frequency=2.412 GHz Access Point: Not-Associated
Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
lo no wireless extensions.
eth0 no wireless extensions.
Configuration of network †
At the configuration items of wlan0 in /etc/network/interfaces, please type in the SSID and passphrase of the access point that you like to access.
# vi /etc/network/interfaces
(`please modify the lines below)
allow-hotplug wlan0
auto wlan0
iface wlan0 inet manual
wpa-ssid "your-ssid"
wpa-psk "your-passwd"
Rebooting †
As the configuration is completed and the system is rebooted, IP address can be obtained. The details are shown below.
root@raspberrypi:~# ifconfig
eth0 Link encap:Ethernet HWaddr b8:27:eb:c2:87:00
inet addr:192.168.0.145 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::ba27:ebff:fec2:8700/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3887 errors:0 dropped:639 overruns:0 frame:0
TX packets:579 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:295688 (288.7 KiB) TX bytes:98761 (96.4 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:2876 errors:0 dropped:0 overruns:0 frame:0
TX packets:2876 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:431834 (421.7 KiB) TX bytes:431834 (421.7 KiB)
wlan0 Link encap:Ethernet HWaddr cc:e1:d5:f7:14:e6
inet addr:192.168.0.143 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::b80b:a0f:2479:5b10/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:41 errors:0 dropped:6 overruns:0 frame:0
TX packets:25 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5772 (5.6 KiB) TX bytes:4430 (4.3 KiB)
Revision History †
- 2016-02-16 This article is initially released.
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