Reciprocal memory access by two Xavier NX boards through PCIe interconnect

Hi all,

I have two Xavier NX boards interconnected by PCIe, one is Root Complex (RC), other is End Point (EP).

I want to have CPU access to RC dedicated local memory from EP card, and vice versa, have CPU access to EP dedicated local memory from RC card.

As I see, the EP driver (pcie-tegra-dw-ep.c) is opening only inbound iATU regions, and RC driver (pcie-tegra-dw.c) is opening only outbound iATU regions.

My question is if it’s possible to access RC memory from the EP without opening outbound iATU region on the EP and inbound iATU region on the CR side?