SiFive CPUs are just as closed as Arm ones, you just pay a royalty to SiFive instead of Arm. Only the ISA itself is open, (fast) implementations are not. (for

SiFive CPUs are just as closed as Arm ones, you just pay a royalty to SiFive instead of Arm. Only the ISA itself is open, (fast) implementations are not. (for any commercial-grade one instead of academic projects)