[Someone]

and one likely reason the boards weren’t there was (https://en.wikipedia.org/wiki/RISC-V#Design):

“As of June 2019, version 2.2 of the user-space ISA[46] and version 1.11 of the privileged ISA[3] are frozen, permitting software and hardware development to proceed. The user-space ISA, now renamed the Unprivileged ISA, was updated, ratified and frozen as version 20191213”

So, it’s more like 5 years old, compared to ≈40 for 32-bit x86, ≈20 for 64-bit x86.

[snvzz]

December 2021, for the specs required by RVA22 which the P550 implements.

P550 was announced shortly after these specs were ratified, so it's one of the earliest RVA22 designs.

I am expecting there'll be others we will get to see this year.