Yes. At FOSDEM, SiFive demonstrated Linux running on its HiFive Unleashed development board, built around the 64-bit Freedom U540 (FU540) RISC-V SoC. Announced on February 7, 2018, it was a real-board milestone—not evidence that every Linux distribution or application was already ready for RISC-V.
What RISC-V board did SiFive boot Linux on?
The demonstration used the HiFive Unleashed, a development board built around SiFive’s Freedom U540 (FU540) SoC. SiFive described the U540 as a 64-bit, 4+1 multicore chip designed to support full-featured operating systems, including Linux. The company announced the board and demonstration on February 7, 2018, after showing it at FOSDEM. SiFive co-founder and CTO Yunsup Lee called the announcement “a historic moment and a major milestone for RISC-V.”
The board paired the U54-MC application-core cluster with an S51 monitor core. SiFive’s product page lists 8GB of ECC DDR4, 32MB of Quad SPI flash, removable MicroSD storage, Gigabit Ethernet, and a ChipLink expansion port. Those are vendor-listed specifications, not independent performance measurements.
What did the Linux milestone establish—and what did it not?
The board demonstration showed that Linux could run on a physical RISC-V development platform, rather than only on a processor design or in an emulator. It did not mean that all Linux software was already ported, that every distribution supported the board, or that RISC-V systems had reached feature parity with other architectures.
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- Flexible MCU Board: Incorporate the ESP32-C3 32-bit RISC-V chip, operating up to 160 MHz, mounted multiple development ports,
- Developer Friendly: Compatible with Arduino IDE, MicroPython, CircuitPython, PlatformIO, ESP IDF, Zephyr, Matter, ESPNow, Meshtastic, WLED, ESPHome, Home Assistant, Ubidots
- Outstanding RF performance: Complete Wi-Fi functions and Bluetooth Low Energy, while supporting communication over 100m with anFL antenna
- Elaborate Power Design: 4 working modes as low as 44 μA in deep sleep mode, while supporting lithium battery charge management
- Thumb-sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form factor
The kernel work was already progressing before the demonstration. In a December 5, 2017 technical update, SiFive said core RISC-V support had been accepted into Linus Torvalds’s tree for the then-planned Linux 4.15 release. The work described included device-tree bindings, early boot and initialization, some interrupt and timer infrastructure, and paging/MMU support. SiFive also cautioned that substantial kernel and user-space work remained. Linux 4.15 is historical context, not a current version recommendation.
Earlier, on October 6, 2017, SiFive introduced its U54-MC core IP as a 64-bit quad-core application processor with Linux, Unix, and FreeBSD support. That description was vendor product information; it was not an independent benchmark. In September 2018, SiFive described releasing FU540-C000 bootloader code that could be imported into projects such as U-Boot, Coreboot, or TianoCore, while noting that the broader open-source chip effort was still incomplete.
Rank #2
- CH32V003 Development Minimum System Board for Nano RISC-V CH32V003F4U6 Chip TYPE-C USB 22Pin
- on-board 24MHz Crystal oscillator
- Power by TYPE-C USB
Can you still buy the HiFive Unleashed?
SiFive currently marks the HiFive Unleashed as discontinued. That status does not establish whether any particular retailer or reseller has remaining inventory, so check the seller and board condition rather than assuming it is available new.
What is SiFive’s current Linux development board?
SiFive’s current development-platform catalog includes the HiFive Premier P550. Its product page describes it as a Linux development platform with Ubuntu 24.04 pre-installed. The P550 is a separate, newer platform—not a continuation of the Unleashed’s U540 hardware. SiFive says it uses an ESWIN EIC7700X SoC with a quad-core SiFive P550 cluster; the page lists 16GB or 32GB LPDDR5 and 128GB eMMC. Product details and software offerings can change, so consult the product page for current status.
Rank #3
- The ESP32-C3 SUPERMINI is positioned as a high-performance, low-power, cost-effective IoT mini development board, suitable for low-power IoT applications and wireless wearable applications
- It is equipped with a rich set of interfaces, including 11 digital I/Os that can be used as PWM pins and 4 analog I/Os that can be used as ADC pins.
- It supports four serial interfaces, including UART, I2C, and SPI.
- The ESP32-C3 features a 32-bit RISC-V CPU, including an FPU (Floating Point Unit) capable of 32-bit single-precision
- Package: 2PCS ESP32-C3 MINI Development Board ESP32 SuperMini ESP32 C3 WiFi Module
How can developers build Linux for SiFive RISC-V hardware?
SiFive’s Freedom SDK for Linux provides a Yocto/OpenEmbedded reference distribution with targets for HiFive boards, evaluation platforms, and QEMU. SiFive says its source package includes bootloaders and OpenSBI. It is a software route for building and customizing Linux; it does not imply that every target has identical hardware support or that every distribution is compatible.
Quick Recap
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- Ample PSRAM Storage – The development board offers 8MB PSRAM, providing substantial extra memory for handling more complex tasks, large data buffers, and advanced processing.
- Enhanced Multi-Tasking Capability – With the additional 8MB PSRAM, the ESP32-C5-WIFI6-KIT can efficiently manage multiple protocol stacks simultaneously, ensuring smooth operation in multi-tasking IoT environments.
- Support for Medium-Load Applications – The 8MB PSRAM allows the ESP32-C5 to handle medium-load applications more effectively, making it ideal for scenarios requiring real-time data processing or continuous communication.
- Seamless Performance – The increased memory improves the overall performance and responsiveness of the device, particularly when running applications with larger memory footprints or more demanding computations.
- Future-Proof for Complex Projects – With 8MB of PSRAM, developers are better equipped to build scalable, high-performance solutions that support both current and future IoT use cases, offering flexibility for future-proofing designs.
Rank #4
- ESP32-C6 WiFi 6 microcontroller development board adopts ESP32-C6-WROOM-1-N8 module, which is equipped with RISC-V 32-bit single-core processor, up to 160MHz main frequency, built-in 8MB Flash
- Integrates WiFi 6, Bluetooth 5 and and IEEE 802.15.4 (Zigbee 3.0 and Thread) wireless communication, with superior RF performance
- Integrates rich peripherals including SPI, UART, I2C, I2S, LED PWM, SDIO and other interfaces, compatible with the pinout of ESP32-C6-DevKitC-1-N8 development board, more convenient to use and expand a variety of peripheral modules
- Onboard CH343 and CH334 USB HUB chips, supports USB and UART development at the same time via a USB-C port
- Comes with online examples and tutorials for ESP-IDF development environment
Unleashed and Premier P550: key differences
| Platform | Processor | Linux status described by SiFive | Memory and storage | Current status |
|---|---|---|---|---|
| HiFive Unleashed | Freedom U540 (FU540), with U54-MC application cores and an S51 monitor core | Linux-capable; used in the 2018 demonstration | 8GB ECC DDR4, 32MB Quad SPI flash, removable MicroSD storage | SiFive labels it discontinued |
| HiFive Premier P550 | ESWIN EIC7700X SoC with quad-core SiFive P550 cluster | Ubuntu 24.04 pre-installed, according to SiFive’s product page | 16GB or 32GB LPDDR5; 128GB eMMC | Listed in SiFive’s current development-platform materials |
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