Using DTB Overlay Dynamically

The system support loading DTB overlay dynamically when the board is running.

mount -t configfs none /sys/kernel/config
mkdir -p /sys/kernel/config/device-tree/overlays/dtoverlay
cd <the dtoverlay.dtbo path>
cat vf2-overlay-uart3-i2c.dtbo > /sys/kernel/config/device-tree/overlays/dtoverlay/dtbo

Besides, you could use the following command to remove the DTBO (Device Tree Blob for Overlay) feature:

rmdir /sys/kernel/config/device-tree/overlays/dtoverlay