Implement new operating system RISCOS on NVIDIA Jetson Nano

We plan to adopt an existing operating system RISCOS (which was the original operating system for ARM CPU’s) to a new hardware platform. Therefore we investigate the possibility to implement it on the NVIDIA Jetson family as they have high performance GPU’s.
Main issue is here how we can implement the video drivers. Can we get support by NVIDIA, Can we get source files (C++ or ARM Assember) to implement the low level functions like video decompression, shading functions etc.?