The Freedom E SDK is a tool bundle maintained by SiFive[1] that makes it easy to get started developing software for the Freedom E RISC-V platform. The SDK is open source an available on GitHub[2]. [1]: https://www.sifive.com/ [2]: https://github.com/sifive/freedom-e-sdk
The right way to do this is to support RISC-V on Crossdev.