The help command show a brief summary of the built-in commands of U-Boot. Printenv this command print the current variables Saveenv this command saves variables previously set in the environment permanent storage space Setenv this command is used to set variables Please check the FAQ page about Driver Model in U-Boot for more information. Now U-Boot moves to the Driver model and use of the Device Tree. Note however that it is possible to avoid this step and to directly boot Linux from AT91Bootstrap, in a production phase for instance. It is responsible of configuring main interfaces and launching a Linux system. U-Boot takes place in the Linux demo as a third stage bootloader. Thematic documentation is also available in the doc/ directory. Note that a detailed documentation is simply available in the source code package as the README file. U-Boot documentation is very rich in addition to the official U-Boot website, several others are dealing with U-Boot getting started or configuration. It is of course available for AT91 ARM processors.
Loading overlays and applying them on top of the DTB.
U BOOT MANUAL HOW TO
How to patch Device Tree Blob in U-boot using Overlays.Boot pre-defined variables and command:.
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