Unable to boot Jetson Orin in root port mode for PCIe communication after kernel recompilation with CONFIG_STRICT_DEVMEM=n

We are trying to establish bi-directional PCIe communication between two Jetson Orin AGX.

We have flashed Jetpack 5.1 using Ubuntu 20.04. For flashing root port Orin we have made changes using PCIe Endpoint Mode — Jetson Linux Developer Guide documentation

On root port we were unable to access devmem due to permission issues and to solve this we have added CONFIG_STRICT_DEVMEM=n in tegra_defconfig and recompiled the kernel using [Kernel Customization — Jetson Linux Developer Guide documentation ]

The build was successful and we were able to flash the orin successfully but the orin is not booting up after that. There is no display. We are not able to access through minicom in recovery mode as well.

How do we resolve this issue to make our Jetson Orin work in root port mode and access devmem?