/usr/share/doc/u-boot-tools/examples/mx6cuboxi.config is in u-boot-tools 2016.03+dfsg1-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # Configuration file for fw_(printenv/saveenv) utility.
# Up to two entries are valid, in this case the redundant
# environment sector is assumed present.
#
# XXX this configuration might miss a fifth parameter for the "Number of
# sectors"
# MTD device name Device offset Env. size Flash sector size
/dev/mmcblk0 0x80000 0x2000
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