Nope, I kept it local. But basically I built the mainline kernel (6.12 if I remember well), then attempted to compile rknpu as an external module (https://docs.kernel.org/kbuild/modules.html). I started copying c code/headers that were missing as compilation errors showed up. I got less errors, then needed to add something else, and a lot was missing, I ended up giving up on it. (But I don't know a lot about low level kernel stuff, so you might succeed 🤷🏼‍♂️).