Resources & Support

HiFive™ Unleashed

Discontinued

Freedom Unleashed

Featuring the Freedom U540 (FU540) SoC, the world’s first Linux-capable, multi-core, RISC-V processor, this developer board marks a brand-new era for RISC-V software - the beginning of support for rich operating systems. With 3 execution modes (Machine, Supervisor, User), Sv39 Virtual Memory, 8GB of DDR4, Gigabit Ethernet, and a ChipLink expansion port, modern operating systems have an ideal RISC-V target. A 5th core (monitor core) is also available for real time applications. SiFive Mix+Match technology offers a potent combination of application and real-time processing. The SiFive Essential™ S51 (RV64IMAC) can service auxiliary functions and cooperate with the SiFive Essential U54-MC cluster, making this an ideal heterogeneous software development platform where Linux and an RTOS can co-exist.

Product Features

SoC

SiFive Freedom U540 SoC

Memory
8GB DDR4 with ECC

Flash Memory
32MB Quad SPI Flash from ISSI

Removable Storage
MicroSD Card

Networking

Gigabit Ethernet Port

Future Expansion

FMC Connector

Advantages of HiFive
Unleashed

If you’re a serious software developer, kernel developer, or Linux enthusiast, we can think of a few reasons to use this board:

  • Port software to the RISC‑V platform
  • Evaluate the SiFive U54‑MC SoC
  • Own the fastest RISC‑V SoC in the world
  • Want multi-core, Linux-capable RISC‑V hardware
  • Want to support open source hardware
  • Need to create the next great thing!

HiFive Unleashed

Dimensions

90 mm wide

120 mm long

HiFive Unleashed
Expansion Board

The HiFive Unleashed Expansion Board converts your HiFive Unleashed into a RISC-V Linux PC. It features a Microsemi PolarFire FPGA preprogrammed as a PCI Express Root Complex, allowing you to connect peripherals to the following:

Peripheral Connections

  • x1 PCI Express connector
  • x16 PCI Express connector with 4 lanes of PCIe connected
  • SSD M.2 connector
  • SATA connector (PCI Express to SATA Bridge)

Join the RISC-V Revolution

Why Choose SiFive
Discover how SiFive’s RISC-V expertise can help you break free from outdated architectures. So you have more freedom to innovate.
Software & Tools
Explore SiFive’s suite of tools designed to accelerate development for chip designers and Software developers.
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The HiFive Premier P550 provides a high-performance Linux development platform in a Mini-DTX Form Factor to enable the next wave of RISC-V Development.