We have added support for RISC-V hardware in our wolfBoot library. The reference example uses the SiFive HiFive1 FE310 board to demonstrate a secure bootloader and firmware upgrade.

The HiFive1 is a 32-bit E31 RISC-V core capable of running at 320MHz. It includes 4MB of external flash and 16KB of internal RAM.

The wolfBoot library provides:

Boot validation of the firmware image using hash and signature Reliable firmware update (power fail safe). Rollback support if application does not report “success” Version checking to prevent downgrade attack Support for external flash on updates

This adds support for:

RV32 Hardware Access Layer (HAL) support for: PLL Clock configuration Flash eSPI UART RTC Firmware update example using the serial interface

Full setup and installation instructions can be found in “docs/Targets.md”.

These new features can be found on GitHub here:

https://github.com/wolfSSL/wolfBoot/pull/14

If you have any questions or run into any issues, contact us at facts@wolfssl.com, or call us at +1 425 245 8247.