Does llvm have good riscv support for cross compiling? In my experience, even aarch64 isn't universally supported as a cross compiling target and building on embedded devices is an exercise in patience. I never even considered trying riscv chips in production since I assumed libs would be a hassle.

Even on rpi4, it's near impossible for a normal person to use the gpu because videocore6 is so locked down that you get zero lib support or documentation. And I'm pretty sure the only assembler is still from reverse engineering instead of the manfr.