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

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
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I have done the following steps again :

  1. I re-flashed the Orin using default BSP.

  2. Made changes to default BSP ( added CONFIG_STRICT_DEVMEM=n in tegra_defconfig) using this Kernel Customization — Jetson Linux Developer Guide documentation

  3. After building the kernel I flashed orin using the command : sudo ./flash.sh -k kernel jetson-agx-orin-devkit mmcblk0p1.
    After this i faced the same issue that my device led is on but there is no display.

  4. After this i reattempted again. I reflashed the orin with default kernel.
    Then I followed this link : Flashing Newly Built Kernel to Jetson AGX Orin causes Jetson to not boot (with logs) - #16 by jtaghipour and copied my modified kernel image to /boot/ and modified /boot/extlinux/extlinux.conf ( as mentioned in this file i have renamed the original kernel as backup and add the required likes to reflect the backup)
    Even after doing this i am not getting any display on reboot.

Am I missing some step ? Kindly guide on what steps to take to allow devmem access for PCIe (CONFIG_STRICT_DEVMEM=n) in Orin.