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February 2025

UEFI Forum Updates All Specs, Dec 2024

UEFI Forum Updates All Specs, Dec 2024
UEFI Forum Updates All Specs, Dec 2024

The UEFI Forum updated all three of its specifications in December, 2024:  ACPI, UEFI, and PI. As a refresher: Advanced Configuration and P...

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William Leara
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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 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...
  • Reverse Engineering UEFI with Ghidra
    Ghidra is a free and open-source tool for software reverse engineering.  It is extensible, and allows for application-specific capabilities...
  • 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...
  • UEFI Forum Updates All Specs, Dec 2024
    The UEFI Forum updated all three of its specifications in December, 2024:  ACPI, UEFI, and PI. As a refresher: Advanced Configuration and P...
  • Language Applications for UEFI BIOS
    Earlier this year I graduated from the University of Texas at Austin with an M.S. in Engineering, majoring in Electrical & Computer Eng...
  • Alex Ionescu’s VisualUefi
    Mr. Alex Ionescu created, and has been maintaining for several years now, a wonderful tool called VisualUefi .  A synopsis, from its home o...

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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
    Why is zeroed out USB drive still showing up in UEFI/BIOS bootmenu? [closed]
  • Vincent Zimmer's blog
    Wind Energy and the Long Arc: Cornell Engineer, December 1990

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