[jburgess777]

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

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.

[whitehexagon]

Open source tool chain and open source cores, wow, nice progress since I last looked into this.