77d is a digic 7 camera.
Digic 6 porting is in progress slowly as there are many changes in the architecture of processor, instructions and many other things that are still to be figured out.
Probably after porting a digic 6 camera it will be easier to Port a digic 7 camera but there's no release date of course.
If you want to help you can, but at this stage you'll need a digic 7 camera, coding skills, arm processor knowledge and A LOT of time