Installed OpenATV 4.0 and 4.1 on my DM800HD.
Tried my USB WLAN which was found in the GUI and was able to scan wireless networks and configure. No connection was made however.
After some investigation I found that lsusb gives no results whatsoever.
So not only USB devices are not found, but also the USB host conroller is invisible.

It does not matter (as far as I have installed / updated iimages) which build I use, none of these give succesful results.