Create the rootfs with buildroot for Xavier NX

I am using the devkit. It is Jetson Xavier NX emmc with L4T 32.4.2.

I want to develop a system with customized rootfs. I need this rootfs to be smaller than 100MB. In the forum, there are some successful cases in Nano and TX2. I wonder do they also work on NX?https://forums.developer.nvidia.com/t/nvidia-jetson-and-buildroot/77935/3