BT shell - board resources used

Hello

I started developing a BT shell based app on the nRf52840DK board and then moved to a custom board.

In the overlay file, I've deleted every nRf52840DK node I could think of (except of UART0) to prevent contention with the board's peripherals.

Still, I see gpios toggling 'on their own'.

My question is - what HW resources does the BT shell uses (other than UART0) and how to disable these?

Thanks

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