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In order to add driver for my wireless adapter,

Bus 001 Device 002: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter

I am building openWRT for my GL.iNet AR150. The source I use is gl-inet/openWRT

According to this page, my card RTL8191SU should be supported by the driver rtl8192su. However, after I chose rtl8192su in make menuconfig and building the whole openWRT, I cannot find the module in /lib/modules. Even more confusing is that, under /lib/modules/ there are two folders, 3.18.84 and 4.9.102, while the kernel I'm running is 4.9.102.

Using find I can locate the pkg of rtl8192su but not the ko files. As a sanity check, I also looked at another driver I selected in menuconfig, rtl8187, which is found but in the /lib/modules/3.18.84 folder instead of 4.9.102 folder. Did I miss something obvious?

Thanks.

Update: Now the adapter can be recognized.

[  545.455019] usb 1-1: new high-speed USB device number 2 using ehci-platform
[  545.651473] r8712u: register rtl8712_netdev_ops to netdev_ops
[  545.655903] usb 1-1: r8712u: USB_SPEED_HIGH with 4 endpoints
[  545.675639] usb 1-1: r8712u: Boot from EFUSE: Autoload OK
[  546.508983] usb 1-1: r8712u: CustomerID = 0x000a
[  546.512163] usb 1-1: r8712u: MAC Address from efuse = 08:10:79:56:a8:90
[  546.518852] usb 1-1: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"

but I am having trouble to connect it to a known network. After ifconfig wlan1 up I can see it's running. However, when I connect it using iwconfig wlan1 essid "_networkID_" key s:_password_ no IP is assigned. Is there anything I can try with to find out what the problem is?

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You should assign an address ip to your interface and set up the default gatway:

iwconfig wlan1 essid "networkID" key s:password

or:

iwconfig wlan1 essid "networkID" key password

Then:

ifconfig wlan1 192.168.1.xxx netmask 255.255.255.0 up
route add default gw 192.168.1.1

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