By the way, I uncommented a line in RK27SDK_0722/Application/MainWin/MainWin.c
Otherwise an intesting debug window appear (by default) :
I especially like this funny message in the bottom, from one of the Rockchip developers.
I don't speak chinese (but know a few japanese kanji) and i think the first three characters mean "chinese people" (?)
But i don't know about the fourth ? any idea ?