Patents.

Open ISA != all implementations of it are free (although in RISC-V case, many are).

My point is that if RISC-V takes off people will struggle to do decent implementations of it without stepping on the toes of the people already in the area.

I'd go so far as to say this is the entire SiFive strategy.

So that is merely the entire semiconductor industry patent portfolio that you will have to avoid.

> Patents tend to expire at different times around the world, plus there is the possibility of submarine patents. Without a declaration from Hitachi, adopting any processor design using their ISA is likely considered a legal risk.

If you combine this with your observation that CPU patents tend to be ISA independent then surely any widespread commercial deployment of RISC-V requires an assertion from everyone else in the semi industry that they do not in fact own patents on your implementation of it or it is likely considered a legal risk.

That or you just hold some things to different standards than others.

You keep trying to spread FUD concerning RISC-V. The issue you are trying to raise is one that if valid, would prevent anyone from designing a CPU, yet many do without legal issues. Hence, the issue you raise is invalid (by modus tollens).

If this was a winning strategy those open source implementations of SuperH cores would have been incredibly popular instead of dying in obscurity.

https://hc2024.hotchips.org/assets/program/conference/day2/2...

In any case, you should probably stop writing before you shove your foot any deeper into your mouth.

> In any case, you should probably stop writing before you shove your foot any deeper into your mouth.

Apology expected.

As for the J2, its creator does not request licensing fees, but Hitachi might require them. Unlike RISC-V, the creator of SuperH (Hitachi) is not known to have declared the ISA to be royalty free. I am not aware of such a declaration and even if there was, it is irrelevant because there is no reason to use SuperH over RISC-V. Nothing about the J2 supports the FUD you are spreading about RISC-V.

You're absolutely out of line.

> As for the J2, its creator does not request licensing fees, but Hitachi might require them.

"FUD". The whole point of the timing of the release of the J2 was it is based purely on now expired Hitachi patents, so they do not require any licensing fees.

By the way, my comment telling you that you should apologize to the community received an upvote and likely will receive more. You really are wasting people’s time with your anti-RISC-V FUD.

I too was upvoted for asking for your apology.

I will not apologize for speaking facts, and nor should you, but it is your random unnecessary insults that are unacceptable.

That's me done with this. You clearly have your opinions, but your behavior has been a discredit to the community you apparently represent.

By the way, having one’s foot in one’s mouth is an idiom meaning you said something wrong, which refers to behavior. It being obvious you are clueless is a reference to your writing, which again, refers to behavior. Saying you should apologize to people for wasting their time is similarly a reference to your behavior, and you invited that criticism by demanding an apology in broken English.