The Freedom E310 chip that has just been released and is available on the HiFive1 dev board supports the RV32I (RV32IMAC to be complete) ISA.
We have the ability to quickly customize items on the E300 platform for custom silicon, and RV32E is one of them.
The E300 Arty FPGA dev kits today currently do not easily support RV32E at this time. The reason for this is because there is very limited software support for RV32E at this time in the community, and we would like to make sure there is a software plan in place before we just throw hardware over the wall.
Please stay tuned for an update on this…
BTW, can you share more info about your interest in RV32E?