Configuration:platform = sifive

SiFive brings the power of open source and software automation to the semiconductor industry, making it possible to develop new hardware faster and more affordably than ever before.

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
Arty FPGA Dev Kit FE310 450MHz 16MB 256MB
HiFive Unleashed FU540 1500MHz 32MB 8GB
HiFive1 FE310 320MHz 16MB 16KB
HiFive1 Rev B FE310 320MHz 16MB 16KB
SparkFun RED-V RedBoard FE310 320MHz 16MB 16KB
SparkFun RED-V Thing Plus FE310 320MHz 16MB 16KB

Stable and upstream versions

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


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

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


platform =
board = ...


Name Description
framework-freedom-e-sdk Open Source Software for Developing on the SiFive Freedom E Platform
framework-zephyr Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures
framework-zephyr-canopennode canopennode Zephyr module
framework-zephyr-civetweb Zephyr module for CivetWeb Embedded C/C++ web server
framework-zephyr-fatfs Zephyr module for FatFS filesystem
framework-zephyr-hal-st Zephyr module for the official libraries provided by STMicroelectronics
framework-zephyr-libmetal Zephyr module for an abstraction layer across user-space Linux, baremetal, and RTOS environments
framework-zephyr-littlefs Zephyr module for littlefs filesystem
framework-zephyr-loramac-node Zephyr module for LoRaWAN endpoint stack implementation
framework-zephyr-lvgl Zephyr module for LittlevGL - an Open-source Embedded GUI Library
framework-zephyr-mbedtls Zephyr module for the mbed TLS library
framework-zephyr-mcuboot Zephyr module for MCUboot - a secure bootloader for 32-bit MCUs
framework-zephyr-mcumgr Zephyr module for mcumgr management library for 32-bit MCUs
framework-zephyr-mipi-sys-t Zephyr module for MIPI System Software Trace
framework-zephyr-open-amp Zephyr module for Open Asymmetric Multi Processing (OpenAMP) framework
framework-zephyr-openthread Zephyr module for OpenThread - an open-source implementation of the Thread networking protocol
framework-zephyr-segger Zephyr module for the Segger RTT library
framework-zephyr-sof Zephyr module for Sound Open Firmware
framework-zephyr-tfm-mcuboot Zephyr module for MCUboot - a secure bootloader for 32-bit MCUs (TFM Dependency)
framework-zephyr-tinycbor Zephyr module for Concise Binary Object Representation Library
framework-zephyr-tinycrypt The TinyCrypt Library provides an implementation for constrained devices of a minimal set of standard cryptography primitives for Zephyr framework
framework-zephyr-trusted-firmware-m Zephyr module for Trusted Firmware M - a reference implementation of secure world software for ARMv8-M
tool-cmake CMake is an open-source, cross-platform family of tools designed to build, test and package software
tool-dtc Device tree compiler
tool-gperf GNU gperf is a perfect hash function generator
tool-jlink Software and Documentation Pack for SEGGER J-Link debug probes
tool-ninja Ninja is a small build system with a focus on speed
tool-openocd-riscv Fork of Open On-Chip Debugger that has RISC-V support
tool-qemu-riscv QEMU is a generic and open source machine emulator and virtualizer
tool-renode Renode is a development framework which accelerates IoT and embedded systems development by letting you simulate physical hardware systems
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
Freedom E SDK Open Source Software for Developing on the SiFive Freedom E Platform
Zephyr RTOS The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with safety and security in mind




Name Debug MCU Frequency Flash RAM
HiFive Unleashed On-board FU540 1500MHz 32MB 8GB
HiFive1 On-board FE310 320MHz 16MB 16KB
HiFive1 Rev B On-board FE310 320MHz 16MB 16KB


Name Debug MCU Frequency Flash RAM
SparkFun RED-V RedBoard On-board FE310 320MHz 16MB 16KB
SparkFun RED-V Thing Plus On-board FE310 320MHz 16MB 16KB


Name Debug MCU Frequency Flash RAM
Arty FPGA Dev Kit On-board FE310 450MHz 16MB 256MB