HiFive Unleashed

$222,621 raised

of $1 goal

Funded! Order Now

Mar 15 2018

funded on

22,262,100%

funded

204

pledges

Product Choices

$999

HiFive Unleashed

Join the revolution! Your early support will help tremendously and you'll be rewarded with the world's first and only Linux-capable, RISC-V-based development board.

Details

The world’s first RISC-V-based, Linux-capable development board

As Featured In

LinuxGizmos.com

"Aside from being open source and customizable, one of the main benefits of RISC-V is that it is fully modern, purpose built, and unburdened with legacy code."

CNXSoft - Embedded Systems News

"RISC-V free and open architecture has gained traction in the last couple of years. SiFive has been one of the most active companies with RISC-V architecture."

Heise Online

"Der SiFive U540 ist der erste Chip mit der offenen 64-Bit-RISC-V-Architektur; seine vier RV64GC-Kerne laufen auch mit Linux."

bit-tech

"The key selling point for the HiFive Unleashed: It's the first off-the-shelf RISC-V product to be able to boot operating systems running the Linux kernel, which recently received mainstream support for the RISC-V ISA."

TechRepublic

"The Hi-Five Unleashed uses one Freedom U540 paired with 8GB DDR4 ECC RAM, as well as 32MB Quad SPI Flash, a microSD card slot for external storage, a Gigabit Ethernet port, and an FMC connector for future expansion cards."

Linux.com

Linux.com

"The 28nm fabricated U540 SoC that drives the SBC is not only the first multi-core and Linux-ready RISC-V processor, but the first to provide cache coherence."

Open Electronics

"The processor is intended to run Linux for applications including AI, machine learning, networking, gateways and smart IoT devices."

industriaembebidahoy

"Siendo la primera en todo el mundo de su arquitectura capaz de ejecutar el sistema operativo del pingüino..."

AB Open

"First unveiled back at FOSDEM, the SiFive HiFive Unleashed Linux-compatible RISC-V development board heralds an exciting time in the world of free and open source silicon..."

Linus Tech Tips

"As making faster CPUs gets more difficult on the hardware side, a group of researchers have looked into improving them on the software side by creating a new instruction set that someday might completely replace x86 and ARM."

We founded SiFive to bring the power of open source to the semiconductor industry. We do this not only by supporting the RISC-V specification, but also by implementing the specification and getting usable chips into the hands of developers as quickly as we can. We did exactly that just over a year ago when we introduced the open source, Arduino-compatible HiFive1 dev board based on our Freedom Everywhere line of 32-bit microcontrollers. Today, we’re proud to be doing the same thing with our Freedom Unleashed 64-bit, Linux-capable system-on-chip (SoC) platform. Meet the HiFive Unleashed, the world’s first RISC-V-based, Linux-capable development board.

Seeing is Believing

Industry skeptics have previously dismissed RISC-V as an academic project, low performance, and only for microcontrollers. HiFive Unleashed, featuring the SiFive Freedom U540 SoC, ends all of that. Linux and RISC-V were meant for each other, and the HiFive Unleashed dev board brings them together for the first time.

Features & Specifications

Here’s what’s actually on the HiFive Unleashed board:

  • SiFive Freedom U540 SoC
  • 8 GB DDR4 with ECC
  • Gigabit Ethernet port
  • 32 MB quad SPI flash from ISSI
  • microSD card for removable storage
  • FMC connector for future expansion

Dimensions

The board measures is 120 mm x 90 mm. If you include the power button, which sticks out from the board, the dimensions are 129 mm x 90 mm.

HiFive Unleashed block diagram

SiFive Freedom U540 SoC

The foundation of the HiFive Unleashed board is the Freedom U540 SoC:

  • World’s fastest RISC-V Processor
  • World’s only Linux-capable RISC-V SoC
  • 4+1 Multi-Core Coherent Configuration, up to 1.5 GHz
  • 4x U54 RV64GC Application Cores with Sv39 Virtual Memory Support
  • 1x E51 RV64IMAC Management Core
  • Coherent 2 MB L2 Cache
  • 64-bit DDR4 with ECC
  • 1x Gigabit Ethernet
  • Built on TSMC 28 nm process

SiFive Freedom U540 SoC block diagram

SiFive Freedom U540 SoC

HiFive Unleashed Use Cases

  • Build a RISC-V computer
  • Add features to Linux
  • Port packages to your distro
  • Be part of the RISC-V revolution

What is RISC-V?

RISC-V has been described as the “Linux” of processors. RISC-V is a free, open, extensible instruction set architecture (ISA) invented by the co-founders of SiFive. The RISC-V specification is now maintained by the nonprofit RISC-V Foundation, whose membership has increased more than six-fold since 2015 and now consists of over 100 members, including some of the largest companies in the world.

Benefits of RISC-V

  • Simple, free and open – lower IP costs
  • Architected for security and customization
  • Established and growing software ecosystem fostered by many, not one
  • Freedom to specialize, optimize, and differentiate

How is SiFive leading the charge?

  • Founded by the creators of RISC-V
  • Most experience in taping out RISC-V chips
  • Leadership role on RISC-V Foundation committees and specifications

Manufacturing Plan

We first publicly demonstrated this board on February 3, 2018 at FOSDEM. Similar to our previous board, the HiFive1, we’re building our initial batches locally and will test each board ourselves.

Shipping & Fulfillment

Crowd Supply will be handling all fulfillment and logistics. As such, all boards will be shipping from Portland, Oregon in the US. See The Crowd Supply Guide for more information on their ordering and shipping policies.

Risks & Challenges

Our early boards are up and running! We are still characterizing and bringing up the board, so the final specs may change slightly. But the silicon and board are in great shape and we can’t wait to see it in the hands of developers!

Ask a Question

Have a question not answered in the description above or in the Updates?

Ask SiFive a Question or Browse the Crowd Supply Guide

Credits

SiFive

SiFive was founded by the creators of the free and open RISC-V architecture as a reaction to the end of conventional transistor scaling and escalating chip design costs.


Andrew Waterman

Yunsup Lee

Krste Asanovic

Palmer Dabbet

Jack Kang

Naveed Sherwani

Sunil Shenoy

The Rest of the SiFive Team!

Subscribe to the Crowd Supply newsletter, highlighting the latest creators and projects: