Porting MotionDriver6.1 to STM32F429 Discovery

I'm porting the eMD6 Project to my STM32F429zi based Discovery. The first problem I faced was that the GPIO PA1 used in the original Project (for STM32F409) was not working for me. I could read the signals from the INT pin of the breakout board while not connected to the PA1 on Discovery. Once connected - the output sunk. I changed it to PA0 and now the external interrupts from do arrive to the MPU.

However one other problem I failed to sort out. The external interrupts are coming as I said, but the registered callback (inv_generate_eMPL_outputs) is never called. All the commands sent from the serial terminal are hanging waiting on this callback.

I'll be really greatfull for tips. Why doesn't MPL call this function?