- published: 26 Dec 2015
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The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant as a replacement for the BIOS firmware interface, present in all IBM PC-compatible personal computers. In practice, most UEFI images have legacy support for BIOS services. It can be used to allow remote diagnostics and repair of computers (and security exploits), even without another operating system.
The original EFI (Extensible Firmware Interface) specification was developed by Intel. Some of its practices and data formats mirror ones from Windows. In 2005, UEFI deprecated EFI 1.10 (final release of EFI). The UEFI specification is managed by the Unified EFI Forum.
The original motivation for EFI came during early development of the first Intel–HP Itanium systems in the mid-1990s. PC BIOS limitations (16-bit processor mode, 1 MB addressable space, PC AT hardware dependencies, etc.) were seen as unacceptable for the larger server platforms Itanium was targeting. The effort to address these concerns was initially called Intel Boot Initiative, which began in 1998 and was later renamed EFI.
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