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Basic Input/Output

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August 2016

The Joy of CrScreenshotDxe

The Joy of CrScreenshotDxe
The Joy of CrScreenshotDxe

I’ve been playing with an open-source (Github-hosted) utility written by Mr. Nikolaj Schlej called CrScreenshotDxe .  This utility is imple...

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7:00 AM
William Leara
2
tools
7:00 AM

The Binwalk Firmware Analysis Tool

The Binwalk Firmware Analysis Tool
The Binwalk Firmware Analysis Tool

I’ve recently been experimenting with a wicked-fun tool you may find useful called Binwalk :  a “fast, easy to use tool for analyzing and ex...

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7:00 AM
William Leara
0
tools
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

  • 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...
  • 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 ...
  • Introduction to the Simple Boot Flag
    The Simple Boot Flag , it turns out, is a bit of a mystery.  Trying to find information about this flag, and/or its associated specification...
  • 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...
  • 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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      • The Joy of CrScreenshotDxe
      • The Binwalk Firmware Analysis Tool
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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
    How to get memory regions and store into a list on 0x00EFFFFF to 0x1CFFFFF (14MB) in kernel?
  • Vincent Zimmer's blog
    Wind Energy and the Long Arc: Cornell Engineer, December 1990

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