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Basic Input/Output

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Introduction to DeviceTree

Introduction to DeviceTree
Introduction to DeviceTree

Devicetree is a representation of a hardware configuration, most especially non-discoverable hardware devices, passed from a bootstrap firm...

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7:00 AM
William Leara
0
misc
7:00 AM

UEFI Forum Switch to Causeway

UEFI Forum Switch to Causeway
UEFI Forum Switch to Causeway

For many years, the Members Area of UEFI.org has been managed by the Kavi Workspace/Higher Logic community management tool.  Recently (Se...

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7:00 AM
William Leara
0
misc, specifications
7:00 AM

Microsoft Project Mu — A Quick Start

Microsoft Project Mu — A Quick Start
Microsoft Project Mu — A Quick Start

Project Mu is a Microsoft-sponsored open-source UEFI BIOS implementation, complementing the original Tianocore open-source implementation....

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7:00 AM
William Leara
0
Microsoft
7:00 AM

ARM's SystemReady Specifications

ARM's SystemReady Specifications
ARM's SystemReady Specifications

The folks at ARM offer a certification program based on a set of hardware and firmware standards: the Base System Architecture (BSA), and B...

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11:53 PM
William Leara
0
ARM, specifications
11:53 PM
 
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welcome

Welcome to the Basic Input/Output website! Here I share things pertaining to the arcane art of PC BIOS development. For spice, I add material about software development in general and some interesting computer history vignettes. Please, try to contain your excitement!
—William Leara
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popular

  • The Keyboard Controller Interface, 0x60/0x64
    The original IBM PC (1981), and its immediate successor, the IBM PC/XT (1983), had keyboards limited to unidirectional communication:  data ...
  • Introduction to UEFI Conformance Profiles
    The UEFI Specification v2.11 is well over two thousand pages, and even the short list of “required elements” in §2.6 assumes a general-purpo...
  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • Introduction to Slim Bootloader
    Slim Bootloader (SBL) is an open-source boot firmware built from the ground up for Intel x86 systems. Designed to be small, fast, and secure...
  • RWEverything. Yes, Everything.
    I’ve done many tools reviews in the history of this web site, so it would be unthinkable to neglect to talk about what may be the biggest a...
  • JEDEC Manufacturer IDs Are a Mess
    The Vendor ID .  Seems like a pretty prosaic topic.  What's to say?  Every vendor has a numeric identifier that is globally unique so th...

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latest UEFI specs

  • UEFI Spec 2.11
  • UEFI PI Spec 1.9
  • ACPI 6.5a

UEFI resources

  • presentations, podcasts, videos
  • white papers

UEFI blog roll

  • BIOS on StackOverflow
    ISO with bootloader written to a CDROM not showing up as a boot entry in bios [closed]
  • Vincent Zimmer's blog
    Pushing the frontier of knowledge

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