Hi @Jimmychea
I hope you are doing well
Please accept my apologies for delayed answer.
After generating the DTS/DTSI files using the config tool for i.MX, you need to manually merge(copy and paste) it in the actual file present in BSP in the arch/arm/dts folder.
This file is only a snippet and not a full device tree file content. There are just basic device tree elements.
Thanks & Regards
Sanket Parekh