Rtl8812au driver modules issue

I installed openwrt on raspberry pi B. And I am trying to use Buffalo 8812au based wireless usb adaptor. I used rtl8812au module. But it seems not recognized.
There does not appeared wlan0 any.
What can I do to use this adaptor ? Any suggestions are welcome.
Here are some outputs

root@OpenWrt:/etc# cat openwrt_release
DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='19.07.1'
DISTRIB_REVISION='r10911-c155900f66'
DISTRIB_TARGET='brcm2708/bcm2708'
DISTRIB_ARCH='arm_arm1176jzf-s_vfp'
DISTRIB_DESCRIPTION='OpenWrt 19.07.1 r10911-c155900f66'
DISTRIB_TAINTS=''
root@OpenWrt:/etc# cat openwrt_version
r10911-c155900f66
/sys/bus/usb/drivers/rtl8812au
root@OpenWrt:~# cd /sys/bus/usb/drivers/
root@OpenWrt:/sys/bus/usb/drivers# ls
       brcmfmac hub kaweth rt2800usb rtl8812au smsc95xx uas usb usb-storage usbfs usbhid
root@OpenWrt:/sys/bus/usb/drivers# cd rtl8812au/
root@OpenWrt:/sys/bus/usb/drivers/rtl8812au# ls
       1-1.2:1.0 bind module new_id remove_id uevent unbind
root@OpenWrt:/sys/bus/usb/drivers/rtl8812au# ls 1-1.2:1.0/
       authorized bInterfaceProtocol ep_02 ep_85 subsystem
       bAlternateSetting bInterfaceSubClass ep_03 ieee80211 supports_autosuspend
       bInterfaceClass bNumEndpoints ep_04 modalias uevent
       bInterfaceNumber driver ep_81 power
root@OpenWrt:/etc/config# cat wireless
config wifi-device 'radio0'
       option type 'mac80211'
       option channel 'auto'
       option hwmode '11a'
       option hwmode '11g'
       option country 'JP'
       option path 'platform/soc/20980000.usb/usb1/1-1/1-1.2/1-1.2:1.0'
       option disabled '0'
       option txpower '10'
config wifi-iface 'default_radio0'
       option device 'radio0'
       option encryption 'psk2+ccmp'
       option network 'wwan'
       option mode 'sta'
       option key 'YYYY'
       option ssid 'XXXX
root@OpenWrt:/etc/config# dmesg|grep RTL
[    8.781807] RTL871X: module init start
[    8.788592] RTL871X: rtl8812au v4.3.14_13455.20150212_BTCOEX20150128-51
[    8.798164] RTL871X: rtl8812au BT-Coex version = BTCOEX20150128-51
[    9.053783] RTL871X: rtw_ndev_init(wlan0)
[    9.071277] RTL871X: module init ret=0
[   19.106958] RTL871X: rtw_ndev_uninit(wlan0)
root@OpenWrt:/etc# ifconfig -a
br-lan    Link encap:Ethernet  HWaddr B8:27:EB:F9:02:11
          inet addr:192.168.10.23  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fd6b:5e26:be3b::1/60 Scope:Global
          inet6 addr: fe80::ba27:ebff:fef9:211/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29537 errors:0 dropped:0 overruns:0 frame:0
          TX packets:804 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1399889 (1.3 MiB)  TX bytes:96636 (94.3 KiB)

eth0      Link encap:Ethernet  HWaddr B8:27:EB:F9:02:11
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29793 errors:0 dropped:0 overruns:0 frame:0
          TX packets:810 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1411665 (1.3 MiB)  TX bytes:104852 (102.3 KiB)

eth1      Link encap:Ethernet  HWaddr 00:10:74:00:35:48
          UP BROADCAST RUNNING MULTICAST  MTU:1514  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28804 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:1802093 (1.7 MiB)

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:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1621 (1.5 KiB)  TX bytes:1621 (1.5 KiB)

Unfortunately the support of this chipset is null.