Not sure if you actually mean that, but to me it sounds like you're implying that ARM is the "original RISC".
The first RISC processor was called RISC-I and came out of Berkeley research in 1981.
Around the same time came out the MIPS cpu, from Standford university, by a group who shortly after founded a company that by 1985 commercialized the first RISC CPU, the R2000.
ARM, SPARC and PA-RISC came out just about the same time.
The ideas were brewing for some time, but I think it's safe to say historically that the name "RISC" was not invented by ARM and that the R in ARM references a pre-existing term that has been developed at Berkeley.
Sure, the IBM 801, the CDC 6600 and others were forerunners, but it was the Berkeley research project that popularized the acronym IIRC.
So good job on that correction but it doesn't seem necessary to downvote me. I thought I had some interesting comments about the future of operating systems on RISC.
I know this is not about that actually, just makes me think about it.
But obviously it's for original RISC i.e. ARM. But anyway I still wonder if something like RISC OS could work on RISC V.
I saw a youtube demo of someone running RISC OS on Raspberry Pi and it was very snappy. Something older like that has had less time to acquire features (that can slow it down or just be bloat).
Besides eliminating bloat, I feel like RISC V is an opportunity to start with some new assumptions. So I am interested to hear how operating systems and software evolve for it. Linux is great but I believe that there is always room for a fresh approach after a few decades.
So I wonder if things like Fuchsia or MirageOS or new Rust things etc. will be targeted to RISC V.