NeoRV32 on nano 9K

2025-02-28

Preface

NeoRV32 is a powerful RISCV5 core

There is an example neorv32 project using the built in 72kb of user flash as instruction memory and with GPIO and JTAG enabled for debugging: Tang Nano 9K github repository.

Environment

Steps

Program FPGA

  • Clone example repo git clone git@github.com/jimmyw/tang_nano_9k_neorv32
  • Open tang_nano_9k project by tang_nano_9k.gprj file in src directory
  • Right-click Place&Route which is in Process interface and choose Clean&Rerun All
  • Compile the userspace code in hello_world using make all
  • Download the generated .fs file to the Embedded Flash of Nano 9K using openFPGALoader -f impl/pnr/tang_nano_9k.fs --user-flash hello_world/neorv32_raw_exe.bin

You can at a later state update the user space flash directly from the bootloader using python uart_upload.py /dev/ttyUSB0 neorv32_exe.bin