Sounds like it needs a GPU driver but is otherwise good to go.

yeah the GPU is almost always the problematic part for anything Imaginations Technologies related.

Wonder why they use this company if there are no drivers?

There are drivers but they are stuck in older kernels and not upstreamed.

The other problem is that there is not much choice of GPU vendors for RiscV right now. Mali is arm only for example.

The blobby GPU is very unfortunate. They could use the Vision Five 1 combo of DSP as GPU.