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August 2021

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

The UEFI 2.9 Specification

The UEFI 2.9 Specification
The UEFI 2.9 Specification

Forgive the delay in publishing, but I've been taking a paternity leave from work recently, and just now getting back into the swing of ...

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7:00 AM
William Leara
1
specifications
7:00 AM
 
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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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  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • 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 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...
  • Guide to the SWEBOK v4.0 Has Been Released
    The Guide to the Software Engineering Body of Knowledge (SWEBOK) v4.0 was released on October 15, 2024. The Guide is a publication of the ...
  • 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...
  • 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...

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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

  • Vincent Zimmer's blog
    Cornell reunion cycle
  • BIOS on StackOverflow
    Why load the value “01301h” into AX before invoking interrupt 10h?

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