I still have not figured out why the OpenChrome DRM drm-next-4.20 branch is not working. Looked at I2C bus subsystem related code commit, but could not really find a commit that will cause a crash like what I observed. As an experiment, played around with Linux 4.18 rc6 to see how it will perform. The good news is that this version is working, and in fact, I am writing this post from the computer I used to compile the code (VIA Embedded EPIA-M830 with VIA Nano 1 GHz). I will test Linux 4.18 rc7 shortly. Since I went back to performing full compilation, it might take a few hours to compile the code and test it.