EXTI configuration in STM32CubeMx for STM32MP157F-DK2

[SFuch.1]

I am having difficulties activating the EXTI interrupt for a pin in the M4 NVIC.

 

What I did:

• Opened STM32CubeMX,
• selected the board STM32MP157F-DK2,
• opted to configure all peripherals in their default state
• Activate SPI5 in the M4 domain, incl. DMA domain
• Select PF3 pin EXTI mode with falling edge trigger detection (in my application serves as a data ready signal that should start the SPI transfer)
• Now trying to activate EXTI Line 3 interrupt in NVIC, but the check-box is greyed out & I have no clue what I am missing to let me activate the EXTI line 3 interrupt

 

Does anyone know what I missed? Attached is the ioc file generated so far.

 

Thank you all so much for any help!

[SFuch.1]

Found it:

On the pin view on the right in STM32CubeMX right-click on the pin and select the M4 core, assigning the pin to it.