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U-Boot Environment Blob Tool

The mkenv is a tool to generate a U-Boot environment binary blob from a text file or extract U-Boot environment variables from a binary blob. It's implementing similar functionality as mkenvimage tool natively used in Linux.

Usage

For printing a general info of usage this tool execute mkenv -?.

$ Usage: mkenv [OPTIONS] COMMAND [ARGS]...

  The U-Boot Make Enviroment Blob Tool

  Options:
    -v, --version  Show the version and exit.
    -?, --help     Show this message and exit.

  Commands:
    create   Create new image from attached file
    extract  Extract image content
    info     List image content

Commands

$ mkenv info FILE

Print the content of U-Boot environment blob in readable format

options:
  • -b, --bigendian - The target is big endian (default is little endian)
  • -o, --offset - The offset of input file (default: 0)
  • -s, --size - The environment blob size (default: 8192)
  • -?, --help - Show help message and exit
Example:
$ mkenv info env.bin

Name:       None
Redundant:  True
Endian:     Little
Size:       8192 Bytes
EmptyValue: 0x00
Variables:
- bootdelay = 3
- stdin = serial
- stdout = serial
- stderr = serial
- baudrate = 115200
- console = ttymxc3
...

$ mkenv extract FILE

Extract the content of U-Boot environment blob and save it as readable text file. That way you can extract the U-Boot environment blob from SD card image.

options:
  • -b, --bigendian - The target is big endian (default is little endian)
  • -o, --offset - The offset of input file (default: 0)
  • -s, --size - The environment blob size (default: 8192)
  • -?, --help - Show help message and exit
Example:
$ mkenv extract env.bin

 Successfully extracted: env.txt

$ mkenv create [OPTIONS] INFILE OUTFILE

Create U-Boot environment blob from input text file and save it as binary file.

options:
  • -r, --redundant - The environment has multiple copies in flash (default: False)
  • -b, --bigendian - The target is big endian (default is little endian)
  • -s, --size - The environment blob size (default: 8192)
  • -?, --help - Show help message and exit
Example:
$ mkenv create env.txt env.bin

 Successfully created: env.bin