Technology
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I agree that it's not completely open, but having an open ISA is alteady a huge step forward.
Yes, the ISA is open as well the reference base design. You can have a closed source implementation of the open ISA.
But with a open ISA you are free from the x86 situation where only three enterprises can make chips and have some real competition. We have some of this with ARM, but as it's a closed ISA and controlled by one enterprise, it's not future proof.
China is leading RISC-V development, and the major Chinese designs are actually open source! The Xiangshan and Alibaba designed cores, as two examples.