Although the specification of the free RISC-V instruction set has been available for years and some different CPU implementations already exist, the RISC-V consortium has only now officially ratified the specification. This software was built to this specification and works forever on RISC-V processors.
To read more, please visit https://www.golem.de/news/cpu-befehlssatz-risc-v-basis-eingefroren-und-ratifiziert-1907-142503.html. Please note that the original article is in German.