How can I make a full build for Shield TV 2019 open source

I download source code according https://nv-tegra.nvidia.com/gitweb/?p=manifest/android/binary.git;a=blob;f=README_SHIELD;h=b042cf636932415c50fb8c9e5346d46b4b4c37e7;hb=1a508fa42d6ae55ee0fe62a3e07559a484794108, but this one seem is not complete system. How can I make a full build for Shield TV 2019 with latest open source?

Another question:
Base on I can’t build Shield TV 2019, I download source from http://nv-tegra.nvidia.com/gitweb/?p=manifest/android/binary.git;a=blob_plain;f=README_NEW_SHIELD;hb=rel-29-partner, I can make full build successfully on this branch, but full-build missing dtb flash file, my shield TV can’t bootup after flash img files without this dtb file. How to fix this ? How to build this dtb file?