mhei / libubootenv

Generic library and tools to access and modify U-Boot environment from User Space

libubootenv - Library to access U-Boot environment

libubootenv is a library that provides a hardware independent way to access to U-Boot environment. U-Boot has its default environment compiled board-dependently and this means that tools to access the environment are also board specific, too.

Source Code: https://github.com/sbabic/libubootenv

Documentation (doxygen): https://sbabic.github.io/libubootenv

Replacement old tools

Part of the library are the replacement of the "fw_printenv / fw_setenv" tools that can be used with any board - they accept as parameter a file as initial environment if none is found on the persistent storage. The syntax for the data configuration file is the same as the one described in the U-Boot project whilst the syntax of the script file is a subset of the original one.

::

    Usage fw_printenv [OPTION]
     -h,                              : print this help
     -c, --config <filename>          : configuration file (by default: /etc/fw_env.config)
     -f, --defenv <filename>          : default environment if no one found (by default: /etc/u-boot-initial-env)
     -V,                              : print version and exit
     -n, --no-header                  : do not print variable name

    Usage fw_setenv [OPTION]
     -h,                              : print this help
     -c, --config <filename>          : configuration file (by default: /etc/fw_env.config)
     -f, --defenv <filename>          : default environment if no one found (by default: /etc/u-boot-initial-env)
     -V,                              : print version and exit
     -s, --script <filename>          : read variables to be set from a script

    Script Syntax:
     key=value
     lines starting with '#' are treated as comment
     lines without '=' are ignored

    Script Example:
     netdev=eth0
     kernel_addr=400000
     foo=empty empty empty    empty empty empty
     bar

License

libubootenv is licensed under LGPL-2.1

OE / Yocto support

Recipe is provided in openembedded-core layer https://git.openembedded.org/openembedded-core/tree/meta/recipes-bsp/u-boot/

Buildroot support

Package is provided in https://git.buildroot.net/buildroot/tree/package/libubootenv

Contributing to the project

Contributions are welcome ! You can submit your patches (or post questions regarding the project) to the swupdate Mailing List:

[email protected]

Please read the contributing chapter in the documentation how to contribute to the project.