DOKK / manpages / debian 12 / libubootenv-tool / fw_setenv.8.en
fw_setenv(8) System Manager's Manual fw_setenv(8)

fw_setenv - Tool for modifying the environment for the bootloader U-Boot

fw_setenv name [ value ]

fw_setenv is a simple tool for modifying the environment for the bootloader U-Boot. The variable name is updated to hold value if it is already set in the environment, else it is created and set. If only the name argument is given, the corresponding variable is deleted. This version of fw_printenv stems from libubootenv and does not hold a built-in default environment. Instead, the default environment is read from a file.

print a help message
configuration file (old fw_env.config)
default environment if no one found
print program's version
read variables to be set from a script

/etc/fw_env.config
Configuration file for fw_setenv. Default value of the --config option.
/etc/u-boot-initial-env
Default U-Boot environment. Default value of the --defenv option.

fw_printenv(8)

2021-06-23