Customer Kernel problem of Jetson nano(OV2740)

[ShaneCCC]

You can just copy your dtb file to Nano and modify the /boot/extlinux/extlinux.conf to add FDT like below to apply the device tree.

FDT /boot/tegra210-p3448-0000-p3449-0000-b00-user-custom.dtb

Also for sensor driver have check below.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/camera_sensor_prog.47.2.html#wwpID0E0XF0HA