r8188eu on buildroot system

[john_e]

Hi!

I am experementing with buildroot and a raspberry pi model B.

Having trouble getting a 802.11n wifi dongle to work.

Google tells me that it uses the r8188eu driver, which is compiled as a module on my system.
I also enabled linux firmware (BR2_PACKAGE_LINUX_FIRMWARE) and Realtek81XX firmware (BR2_PACKAGE_LINUX_FIRMWARE_RTL_81XX)

lsmod tells me that the RaLink rt2800usb driver is loaded, so i remove it and modprobe my r8188eu driver.
lsmod now shows:

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Module                  Size  Used by    Tainted: G  
r8188eu               418110  0 
fuse                   81055  2 
i2c_dev                 5373  2 
ipv6                  316873 12 [permanent]
evdev                  10085  0 
i2c_bcm2708             5283  0 
uio_pdrv_genirq         3094  0 
uio                     7568  1 uio_pdrv_genirq

dmesg tells me that the usb device is discovered.

ifconfig -a does not show wlan0

ifup wlan0 gives me the error:
ip: SIOGIFFLAGS: No such device

I use this /etc/network/interface file:

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auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

#auto wlan0 #I get an error if both auto wlan0 and allow-hotplug wlan0 is enabled
allow-hotplug wlan0
iface wlan0 inet dhcp
        wireless-essid Lunatech
        wireless-key my_key

Kernel: 4.1.5
Device manager: eudev

So... What did I miss?