RISC-V has a base ISA and many extensions, several of which are virtually required to run a "real" OS with features such as virtual memory. Every build of Linux

RISC-V has a base ISA and many extensions, several of which are virtually required to run a "real" OS with features such as virtual memory. Every build of Linux I've seen for RISC-V is for an RVGC processor with an additional privileged mode. Theoretically it should be possible to run "Linux" on a glorified microcontroller like the OP with μClinux, but I haven't seen that used for "real" work. It certainly couldn't be used as a general purpose OS.