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July 2017

PI 1.6, Courtesy of Nikolaj

PI 1.6, Courtesy of Nikolaj
PI 1.6, Courtesy of Nikolaj

The UEFI Forum recently announced updates to the UEFI, PI, and ACPI specs.  In a previous post , I mentioned how Nikolaj Schlej tweeted...

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

UEFI 2.7, Courtesy of Nikolaj

UEFI 2.7, Courtesy of Nikolaj
UEFI 2.7, Courtesy of Nikolaj

The UEFI 2.7 Spec was recently released, as I’ve mentioned before .  Every time a new version of the spec is released, I have this great ide...

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6:00 PM
William Leara
0
specifications
6:00 PM
 
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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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  • 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...
  • 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...
  • EDID and DisplayID
    In " The Before Times" (think: 1980s), there was no way for graphics adapters and monitors to negotiate a common set of supported...
  • 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...
  • RU!
    I recently did a review of the beloved RWEverything utility.  RWEverything is an easy to use and powerful utility for BIOS developers that ...

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      • PI 1.6, Courtesy of Nikolaj
      • UEFI 2.7, Courtesy of Nikolaj
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latest UEFI specs

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

UEFI resources

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  • white papers

UEFI blog roll

  • BIOS on StackOverflow
    transfer address by memory address
  • Vincent Zimmer's blog
    big money, open source, papers

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