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Basic Input/Output

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June 2016

Gource on EDKII Source

Gource on EDKII Source
Gource on EDKII Source

I’ve been experimenting with a super-neat source code management (SCM) visualization tool called Gource . In Gource, software projects are ...

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7:00 AM
William Leara
0
EDK, tools, VCS
7:00 AM

New Technical Forum for PCI-SIG Members

New Technical Forum for PCI-SIG Members
New Technical Forum for PCI-SIG Members

It’s not unusual for BIOS developers to work deep in the bowels of PCI subsystems, utilizing bus analyzers and Mindshare books to debug di...

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7:00 AM
William Leara
0
PCI
7:00 AM
 
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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 SeaBIOS
    SeaBIOS is an open-source implementation of a 16-bit x86 BIOS. The name is a pun: it is a BIOS written in C (instead of the traditional asse...
  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • 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...
  • 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...

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      • Gource on EDKII Source
      • New Technical Forum for PCI-SIG Members
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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
    BIOS teletyping string does not type out properly
  • Vincent Zimmer's blog
    Electromagnetics for the win

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