Das U-Boot

Das U-Boot (the universal bootloader), is arguably the richest, most flexible, and most actively developed FOSS bootloader available. It's released under the GNU GPL and maintained at http://www.denx.de/wiki/U-Boot/.

Uboot can be build with OpenWrt Buildroot, Embedded Linux Development Kit, and others. For documentation see ELDK-4 / ELDK-5.

1. retrieve source code, patch support for you hardware if not already contained in that mainline version
2. use a toolchain of your choice to build

→http://www.denx.de/wiki/view/DULG/UBootDoesntRunAfterUpgradingMyCompiler

→ uboot.config
→ flashlog

• ftp://ftp.denx.de/pub/u-boot/ Obtain latest version
• http://www.denx.de/wiki/U-Boot/Documentation
  • Das U-Boot Presentation A short presentation for a quick overview
  • Das U-Boot online manual The Manual
  • FAQ
• Blackfin
• Porting U-Boot for a new Blackfin device Blackfin specific, but you can milk this for information
• U-Boot as coreboot payload just for fun

If somebody writes a patch for the bootloader implementation of a particular device, you will find links to this on the wiki-page for that device. Additionally, we accumulate all the patches written for a particular bootloader on its own page. Hopefully, you can get a better comprehension of the functionality of the bootloader by having a look at them:

• For the Marvell Kirkwood (e.g. Seagate Dockstar) https://github.com/doozan/uBoot by Jeff Doozan
• For Qualcomm Atheros AR9331 based devices (and now also AR9341 and AR9344)
  • U-Boot 1.1.4 modification by Piotr Dymacz (pepe2k)
    • started with http://code.google.com/p/wr703n-uboot-with-web-failsafe/
    • Official repository now on GitHub
    • How to Build ( Github read-me and additional build info ) pepe2k
    • OpenWrt forum discussion
    • An article (in Polish) about one of the first versions of this project on www.tech-blog.pl