Intel developed the original Extensible Firmware Interface ( EFI) specifications. ![]() UEFI replaces the BIOS which was present in the boot ROM of all personal computers that are IBM PC-compatible, although it can provide backwards compatibility with the BIOS using CSM booting. Examples of firmware that implement these specifications are AMI Aptio, Phoenix SecureCore Tiano, TianoCore EDK II and InsydeH2O. ![]() They define the architecture of the platform firmware used for booting and its interface for interaction with the operating system. UEFI ( Unified Extensible Firmware Interface) is a set of specifications written by the UEFI Forum. They can use different I/O protocols, but SPI is the most common. ![]() The UEFI implementation is usually stored on a NOR-based EEPROM that is located on the mainboard.
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