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 get an idea about 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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