uboot-mdb-dump

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.)

Example usage

• 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.b from the serial capture file.

• Pipe it through uboot_mdb_to_image.py

  # python3 uboot_mdb_to_image.py < test.cap | hexdump -C
  00000000  de ad be ef de ad be ef  de ad be ef de ad be ef  |................|
  *
  00000050