Build Minimal Buster images with rockchip-bsp

Hello Dear community

i want to build a minimal ubuntu buster image with rockcheap-bsp , similar to radxa images.

Can anyone give some tips how to make it ? I think i have to edit the linaro.list.chroot file in customazation folder inside ubuntu-build-service with specific packages.

Also due to the missing kernel modules ,dtbs and initrd image with ./build/ rockpis, i want to modify the script to create kernel dep with the “make bindeb-pkg” in order that packages to be installed with ubuntu-build-service