CHIPS Alliance

Configuration:platform = chipsalliance

The CHIPS Alliance develops high-quality, open source hardware designs relevant to silicon devices and FPGAs.

For more detailed information please visit vendor site.


Debugging - “1-click” solution for debugging with a zero configuration.

Tools & Debug Probes

Supported debugging tools are listed in “Debug” column. For more detailed information, please scroll table by horizontal. You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).


You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions.

On-Board Debug Tools

Boards listed below have on-board debug probe and ARE READY for debugging! You do not need to use/buy external debug probe.

Name MCU Frequency Flash RAM
RVfpga: Digilent Nexys A7   320MHz 16MB 1.16MB

Stable and upstream versions

You can switch between stable releases of CHIPS Alliance development platform and the latest upstream version using platform option in “platformio.ini” (Project Configuration File) as described below.


; Latest stable version
platform = chipsalliance
board = ...

; Custom stable version
platform = chipsalliance@x.y.z
board = ...


platform =
board = ...


Name Description
framework-wd-riscv-sdk The WD Firmware package contains Firmware applications and Processor Support Package (PSP) for various cores, alongside demos which support all features.
tool-openocd-riscv-chipsalliance Fork of Open On-Chip Debugger that has RISC-V support and enabled VPI JTAG
tool-verilator-swervolf Verilator is an open-source SystemVerilog simulator and lint system
tool-whisper Whisper is a RISCV instruction set simulator (ISS) developed for the verification of the Swerv micro-controller. It allows the user to run RISC-V code without RISC-V hardware
toolchain-riscv GNU toolchain for RISC-V, including GCC


Linux Users:

Windows Users:

Please check that you have a correctly installed USB driver from board manufacturer


Name Description
FreeRTOS FreeRTOS is a real-time operating system kernel for embedded devices that has been ported to 40 microcontroller platforms
WD-Firmware The WD Firmware package contains firmware applications and Processor Support Package (PSP) for various cores, alongside demos which support all features




Name Debug MCU Frequency Flash RAM
RVfpga: Digilent Nexys A7 On-board   320MHz 16MB 1.16MB