This crate is right now being developed on hifive1-revb board. Hifive1-revb board has RV32IMAC core FE310-G002.
For more explanation on this code, refer following youtube channels.
Rustic-Wires: https://www.youtube.com/channel/UCKlt4fIkiJzwemrWSM-8PMg
LearnRISC-V: https://www.youtube.com/c/LearnRISCV