Hello Berthold,
have you got it working? My setup looks like this - i have connected the usb port of the converter board
with the usb host port of the bbb. After connecting all wires i just get the green led on the
little usb touchscreen board blink. Screen keeps black.
The BBB is brand new - without any software modifications.
So we may have to try to rebuild the kernel with support for the cape?
http://www.chalk-elec.com/?p=1605
Hope for good news …
Steffen