Freedom U540

The Freedom U540 is a microprocessor using the RISC-V open architecture by fabless semiconductor company SiFive that is used to power the HiFive Unleashed computer.^[1][2] The U540 is one of the first commercially available microprocessors to use the RISC-V architecture, which is in contrast to the majority of the market, which uses mostly proprietary x86 and ARM microarchitectures. As the U540 was designed specifically for the HFU, it is not available on other devices or as a standalone component^{[citation needed]}.

Freedom U540

General information
Launched	Early 2018
Designed by	SiFive
Architecture and classification
Technology node	28nm
Instruction set	RISC-V
Physical specifications
Cores	4

The U540 has a partial compatibility with coreboot.^[3]