yes the khadas vim works really good with the opengl in framebuffer mode,
also optimizing the boot process my image was able to boot from the internal flash and starts an opengl program that show some graphics in about 5 secs… 
I did it on the ubuntu base kernel source and the ubuntu base root.
Also I did a build of libSDL2 for the khadas vim (with full support for opengl and sound).
The opengl SE worked fine, but I did some changes to the kernel code to keep it working.
But after that I had other projects , I was and I am really busy, and this project on the khadas vim is actually in “paused” mode.
In the next weeks if I have time I could push the code on my github or the image on some repo.
Pier