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    https://en.wikipedia.org/wiki/UEFI

    UEFI - Wikipedia

    Like BIOS, UEFI initializes and tests system hardware components (e.g. Memory training, PCIe link training, USB link training), and then loads the boot loader from a mass storage device or through a network connection. In x86 systems, the UEFI firmware is usually stored in the NOR flash chip of the … See more

    Overview

    Unified Extensible Firmware Interface is a specification that defines the architecture of the platform firmware used for booting the computer hardware and its interface for interaction with the operating system. Examples of … See more

    Advantages

    The interface defined by the EFI specification includes data tables that contain platform information, and boot and runtime services … See more

    Features

    Services
    EFI defines two types of services: boot services and runtime services. Boot services are available only while the firmware owns the … See more

    Boot stages

    SEC – Security Phase
    This is the first stage of the UEFI boot but may have platform specific binary code that precedes it. (e.g., Intel ME, AMD PSP, CPU See more

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    History

    The original motivation for EFI came during early development of the first Intel–HP Itanium systems in the mid-1990s. See more

    Compatibility

    Processor compatibility
    As of version 2.5, processor bindings exist for Itanium, x86, x86-64, ARM (AArch32) and See more

    Classes

    UEFI machines can have one of the following classes, which were used to help ease the transition to UEFI:
    • Class … See more

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  3. Wikipedia
    https://en.wikipedia.org/wiki/Operating_system

    Operating system - Wikipedia

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    https://en.wikipedia.org/wiki/Oklahoma_City_bombing

    Oklahoma City bombing - Wikipedia