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The Universal Boot Loader (Das U−Boot) Table of contents: • 1. Abstract ♦ 1.1. Introduction ♦ 1.2. History ♦ 1.3. Supported Hardware ♦ 1.4. Design Principles ♦ 1.5. User Interface ♦ 1.6. Basic Command Set ♦ 1.7. Advanced Commands ◊ 1.7.1. Logbuffer Manipulation Commands ◊ 1.7.2. Bedbug Embedded Debugger Commands ◊ 1.7.3. POST − Hardware Diagnose Commands ♦ 1.8. Environment Variables ♦ 1.9. Boot Options ♦ 1.10. Command Interpreters ♦ 1.11. Standalone Programs ♦ 1.12. Special Features ◊ 1.12.1. Bitmap and Splash Screen Support ◊ 1.12.2. Boot Count Limit ◊ 1.12.3. Keyboard Support ◊ 1.12.4. Automatic Updates ♦ 1.13. Resources, Summary 1. Abstract This is a presentation about U−Boot, the universal boot loader. The online version of this presentation is available at http://www.denx.de/twiki/bin/view/UBootdoc/Presentation or, as a PDF file, at http://www.denx.de/twiki/publish/UBootdoc/UBootdoc.pdf This document was generated at Thu Jun 3 15:25:09 2004. 1.1. Introduction • The Universal Bootloader ( Das U−Boot) is a monitor program. • Free Software: full source code under GPL • hosted on SourceForge: /projects/u−boot • production quality: used as default boot loader by several board vendors • portable and easy to port and to debug • many supported architectures: PPC, ARM, MIPS, x86, m68k, NIOS, Microblaze • more than 216 boards supported by public source tree • many, many features 1.1. Introduction 1 1.2. History •