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[http://www.denx.de/wiki/U-Boot/ Das U-Boot] (Universal Bootloader) is an open source, primary boot loader used in embedded devices. It Its primary purpose in the shipping system is available for to load some operating system. That means that U-Boot is necessary to perform a number of different computer architecturescertain task, including PPCbut it's nothing you want to throw any significant resources at. Typically U-Boot is stored in relatively small NOR flash memory, ARM, MIPS, AVR32, x86which is expensive compared to the much larger NAND devices often used to store the operating system and the application.