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Freescale Semiconductor Literature Distribution Center P.O. Box 5405 Denver, Colorado 80217 1-800-441-2447 or 303-675-2140 Fax: 303-675-2150 [email protected]. Document Number: AN3220 Rev. 0, 01/2006 Information in this document is provided solely to enable system and software implementers to use Freescale.

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address of the initial RAM disk. Use '-' to boot a kernel with a device tree but without an initial RAM disk. size. size of the initial RAM disk. This parameter must be specified for raw initial RAM disks. fdt. address of the device tree.

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The U-Boot Documentation. This is the top level of the U-Boot's documentation tree. U-Boot documentation, like the U-Boot itself, is very much a work in progress; that is especially true as we work to integrate our many scattered documents into a coherent whole. Please note that improvements to the documentation are welcome; join the U-Boot.

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Falcon mode advantages and drawbacks. Main advantage: since Linux and U-Boot are both loaded to RAM, . U-Boot's Falcon Mode mainly saves time by directly loading Linux from the SPL instead of loading and executing the full U-Boot first. Drawback: you lose the flexibility brought by the full U-Boot.

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U-Boot init sequence U-Boot will run two lists of functions whose purpose is to init or configure specific IPs before the user have access to the console, the first list is defined incommon/board_f.cin the static init_fnc_t init_sequence_f[]array, first list takes care of initialising DRAM, mapping it and relocating the bootloader

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Loading Images with U-Boot. While U-Boot is used to load and execute the OS after initial programming, it can also be used to program the OS images to the local flash. This page describes the process of using U-Boot to load Linux kernel and filesystem images from a TFTP server and save them to the local flash for use during the boot process.

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U-Boot is a boot loader that allows you to run commands that can read and write to/from QSPI or SD cards, load files from a TFTP server, program QSPI using USB DFU, start Linux or other OS and start the Cortex-M3 processor. It also initialises the DDR controller.

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4. U-Boot commands 4.1 Overview U-Boot has a set of built-in commands for booting the system, managing memory, and updating an embedded system's firmware. By modifying U-Boot source code, you can create your own built-in commands. 4.2 Built-in commands For a complete list and brief descriptions of the built-in commands, at the U-Boot monitor.

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The typical way to add a completely new functionality to U-Boot is writing driver code, writing the command front-end for it, and enable them both with CONFIG flags. In some cases, a segment is added in the initialization sequence, in order to prepare the hardware before any command is issued. Continue to part II, which explains how to add.

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This can reduce image size significantly for very simple boot procedures. - Regular expression support: CONFIG_REGEX If this variable is defined, U-Boot is linked against the SLRE (Super Light Regular Expression) library, which adds regex support to some commands, as for example "env grep" and "setexpr".

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Written primarily in C and Assembly, U-Boot is an open-source project developed by Magnus Damm, considered to this day to be the richest, most flexible and most actively developed bootloader. It supports various architectures such as ARM, MicroBlaze, MIPS, PPC, RISC-V, x86, and also contains some drivers for embedded device development boards.

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As I said earlier, U-Boot is a richly documented bootloader. The README file included with the package, for example, covers the use of U-Boot extensively. Among other things, it discusses the package's source code layout, the available build options, U-Boot's command set, and the typical environment variables used in U-Boot.

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U-Boot passes the content of the "bootargs" environment variable as commandline to the kernel, so any parameters for the kernel and the installer - such as the console device (see Section 5.3.1, "Boot console") or preseeding options (see Section 5.3.2, "Ubuntu Installer Parameters" and Appendix B, Automating the installation using.

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U-Boot commands 4.1 Overview U-Boot has a set of built-in commands for booting the system, managing memory, and updating an embedded system's firmware. By modifying U-Boot source code, you can create your own built-in commands. 4.2 Built-in commands For a complete list and brief descriptions of the built-in commands, at the U-Boot monitor prompt,

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The bootm command is used to boot an Operating System. It has a large number of options depending on what needs to be booted. Note that the second form supports the first and/or second arguments to be omitted by using a hyphen '-' instead. fit_addr / fit_addr2 / fit_addr3. address of FIT to boot, defaults to CONFIG_SYS_LOAD_ADDR.

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I believe that the difference is that U-boot is Open Source. U-Boot was first created for a 8xx PowerPC. It was moved to sourceforge.net with the name of PPCBoot. Two years later it merged with ARMBoot, a bootloader for ARM cpu. Then, it evolved to support various other chips and platforms. BIOS was created for IBM PCs.