This is a small script hacked together to convert a memory dump
obtained by md.b in U-Boot via a serial console to binary form. (The
particular U-Boot used here was an ancient U-Boot 2008.10)
The script expects the output of md.b on stdin and outputs the
binary data to stdout. It does a couple of consistency checks when
doing so (consecutive addresses at the beginning of lines; mapping
between hex representation and ASCII representation of a byte is
consistent.)
$ sudo apt install python3-pip
$ pip3 install --upgrade pip
$ pip3 install -r requirements.txt-
In U-Boot, do e.g. the following (and capture the serial communication):
=> md.b 0x4000000 0x50 04000000: de ad be ef de ad be ef de ad be ef de ad be ef ................ 04000010: de ad be ef de ad be ef de ad be ef de ad be ef ................ 04000020: de ad be ef de ad be ef de ad be ef de ad be ef ................ 04000030: de ad be ef de ad be ef de ad be ef de ad be ef ................ 04000040: de ad be ef de ad be ef de ad be ef de ad be ef ................ =>Note: The length must be a multiple of 0x10!
-
Remove all but the output of
md.bfrom the serial capture file. -
Run uboot_mdb_to_image.py
$ python3 uboot_mdb_to_image.py
usage: uboot_mdb_to_image.py [-h] [-l LINE_LENGTH] [-o OUTFILE] logfile
uboot_mdb_to_image.py: error: the following arguments are required: logfile- Check the help menu
$ python3 uboot_mdb_to_image.py -h
usage: uboot_mdb_to_image.py [-h] [-l LINE_LENGTH] [-o OUTFILE] logfile
positional arguments:
logfile
optional arguments:
-h, --help show this help message and exit
-l LINE_LENGTH, --line_length LINE_LENGTH
Bytes in each line
-o OUTFILE, --outfile OUTFILE
File to store the results- Run it with correct input
$ python3 uboot_mdb_to_image.py outfile.log
[+] Repairing image...
100%|█████████████████████████████████████████████| 425997/425997 [00:00<00:00, 436458.66it/s]
[+] Extracting...
<...Clipping output...>- Create better logfile cleaning
- Allow for XXD input