Hi,
I'm trying to do the same with Banana Pi + 7" LCD module. But my display stays dark.
installed the toolchain changed the additional line for the 7" display to:
added pwm group to .dts file like Martin did made no changes to compile.sh ./compile.sh with latest stable Jessie kernel + Desktop Environment
With a plugged in HDMI Monitor my BPi start correctly to Desktop. With unplugged HMDI unfortunately my 7" LCD stays dark
What have I done wrong? :-)