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5.7. Initial Steps

In the default configuration, U-Boot operates in an interactive mode which provides a simple command line-oriented user interface using a serial console on port UART1.

In the simplest case, this means that U-Boot shows a prompt (default: =>) when it is ready to receive user input. You then type a command, and press enter. U-Boot will try to run the required action(s), and then prompt for another command.

To see a list of the available U-Boot commands, you can type help (or simply ?). This will print a list of all commands that are available in your current configuration. [Please note that U-Boot provides a lot of configuration options; not all options are available for all processors and boards, and some options might be simply not selected for your configuration.]

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With the command help <command> you can get additional information about most commands:

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Most commands can be abbreviated as long as the string remains unambiguous:

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5.6. Initialization 1. Abstract 5.8. The First Power-On
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