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mkubootenv
==========
Create an U-Boot environment image suitable for flashing. The input is a text
file containing environment variable definitions in the format “name=value”,
separeated by newlines.
Usage
-----
usage: mkubootenv [-s <size>] <source file> <target file>
Options:
-s <size> set size of the target image file to <size> bytes. If <size> is
bigger than the source file, the target image gets padded with
null bytes. If <size> is smaller than the source file, an error is
emitted.
-r reverse operation: get plaintext env file (target) from binary
image file (source)
File formats
------------
The U-Boot environment is stored in a simple file format, described in
include/environment.h of the U-Boot source tree as follows:
/**************************************************************************
*
* The "environment" is stored as a list of '\0' terminated
* "name=value" strings. The end of the list is marked by a double
* '\0'. New entries are always added at the end. Deleting an entry
* shifts the remaining entries to the front. Replacing an entry is a
* combination of deleting the old value and adding the new one.
*
* The environment is preceeded by a 32 bit CRC over the data part.
*
**************************************************************************
*/
The input file format for mkubootenv is a simple text file containing
'name=value' pairs, separated by newlines ('\n'). This means, there are _no
newlines allowed_ inside the variable names or values.
See the example/ directory for an example input file (uboot_env.env) and its
corresponding output file (uboot_env.bin).
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