You are probably wrong: The quartz is for the ILO and needs a 32.768kHz crystal. For the IMO there is no place on the board to connect a crystal to, nor are there any caps for that. Have a look into the schematic of your board.
Not probably :-P Duh!
I got it working now with the 20Mhz crystal connected to 15_0 and 15_1 and two (external) caps (18pf)...