fw_printenv/fw_setenv, a command line interface to U-Boot environment
usage: fw_printenv [-a key] [-n] [variable name]
 fw_setenv [-a key] [variable name] [variable value]
 fw_setenv -s [ file ]
 fw_setenv -s - < [ file ]
The file passed as argument contains only pairs name / value
Example:
# Any line starting with # is treated as comment
netdev eth0
 kernel_addr 400000
 var1
 var2 The quick brown fox jumps over the lazy dog
A variable without value will be dropped. It is possible
to put any number of spaces between the fields, but any
space inside the value is treated as part of the value itself.
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