This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

SiFive HiFive1


The HiFive1 is an Arduino-compatible development board with an FE310 RISC-V SoC. Two revisions of this board are supported in Zephyr: HiFive1 (also known as HiFive1 Rev A) and HiFive1 Rev B.

SiFive HiFive1 board

SiFive HiFive1 board (image courtesy of SiFive)

SiFive HiFive1 Rev B board

SiFive HiFive1 Rev B board (image courtesy of SiFive)

Programming and debugging


Applications for the HiFive1 board configuration can be built as usual (see Building an Application) using the corresponding board name:

west build -b hifive1



In order to upload the application to the device, you’ll need OpenOCD with RISC-V support. Download the tarball for your OS from the SiFive website and extract it.

The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the -DOPENOCD=<path/to/riscv-openocd/bin/openocd> parameter when building:

west build -b hifive1 -- -DOPENOCD=<path/to/riscv-openocd/bin/openocd>

When using a custom toolchain it should be enough to have the downloaded version of the binary in your PATH.

Now you can flash the application as usual (see Building an Application and Run an Application for more details):

west flash

Depending on your OS you might have to run the flash command as superuser.


Refer to the detailed overview about Application Debugging.