edit I missed duskwuff's answer, which is better informed than mine. I'll leave this here anyway. How open is OpenSPARC? Are there patent concerns? RISC-V isn

edit I missed duskwuff's answer, which is better informed than mine. I'll leave this here anyway. How open is OpenSPARC? Are there patent concerns? RISC-V isn't aiming to revolutionise CPU architecture with a radical new design, it's aiming to offer a Free and Open, patent-unencumbered, fairly conventional RISC ISA. They're quite open about their emphasis on openness. [0] For a project that aims to turn CPU design on its head, there's the Mill processor, although it's broadly thought to be vaporware. [0] https://riscv.org/why-risc-v/ https://riscv.org/why-risc-v/