I purchased a DE10-nano last year with the plan to try some FPGA RISC-V based development... but got lost in the number of extensions and versions of RISC-V kicking around. Has anyone tried this? I'd also be interested how it compares performance wise to the above, and Pi4, see if it worth the effort. Anyway at least it got some good use with MiSTer :) I kinda hope Raspberry adopts RISC-V on their next SBC, but hopefully with more open hardware.

https://github.com/litex-hub/linux-on-litex-vexriscv

The CPU will likely have a clock speed around 100Mhz, far slower than the 1.5Ghz 64bit cores on the VisionFive 2 or Pi4. The FPGA might still be useful if you want to customize the CPU or integrate other custom hardware.