Extensible Firmware Interface (EFI) and Unified EFI (UEFI)


Extensible Firmware Interface

The Unified EFI (UEFI) specification (previously known as the EFI specification) defines an interface between an operating system and platform firmware. The interface consists of data tables that contain platform-related information, boot service calls, and runtime service calls that are available to the operating system and its loader. These provide a standard environment for booting an operating system and running pre-boot applications.

The UEFI specification was primarily intended for the next generation of IA architecture-based computers, and is an outgrowth of the "IntelĀ® Boot Initiative" (IBI) program that began in 1998. Intel's original version of this specification was publicly named EFI ending with the EFI 1.10 version. In 2005 The Unified EFI Forum was formed as an industry-wide organization to promote adoption and continue the development of the EFI specification. Using the EFI 1.10 specification as the starting point, this industry group released the follow on specifications renamed Unified EFI. The current version of the UEFI Specification can be found at the UEFI web site.

More information


The latest version of the UEFI specification is available from the UEFI web site.

Tools and utilities


Recent presentations from the Intel Developer Forum provide updates on UEFI.


Please contact your UEFI Firmware provider for local training in your geography. If you need to setup your own training, contact us for material.

Mailing list

To help us keep people informed of news on Intel events and UEFI industry events, we've set up an EFI Mailing List.

Related information

Platform innovation framework

The Intel® Platform Innovation Framework for EFI (referred to as "the Framework") is a product-strength firmware implementation that is compliant to the UEFI specification.

UEFI Industry group

Latest UEFI and foundation code for EFI implementations

Firmware providers

Third party EFI hardware debuggers

Microsoft EFI Disk Utilities

Linux* ELILO* sources

Archival information

The information in this section is for reference information and not for current product implementation.



Tools and utilities

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