The repo below has support for building a 32bit RISC-V CPU for de10nano. It also includes information about booting Linux. https://github.com/litex-hub/linux-o

The repo below has support for building a 32bit RISC-V CPU for de10nano. It also includes information about booting Linux. https://github.com/litex-hub/linux-on-litex-vexriscv 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.