Rockbox on Sansa e200

The rockbox project is currently doing a port of the open-source firmware to the Sansa e200.

Firmware Backup

In order to restore the original firmware or to have dual-boot rockbox/sansa running it is handy to have the original firmware available. During the auto-update process of the firmware the following two file were written to the root directory:

• Version 1.02.15 (European)
  • Bootloader: BL_SD_BOARDSUPPORTSD.ROM (md5sum: 6a10d79a2e13f6b4a7c8243f422e5608)
  • Firmware image: PP5022.MI4 (md5sum: 24acc7bbe5236d8a926d3445a40fdfb9)

This and other versions can also be found here.

Decoding the Firmware

• Compile and install arm-elf cross compiler toolchain
• Get mi4code from http://daniel.haxx.se/sansa/mi4code.html
• apt-get install libgcrypt11-dev
• gcc -o mi4code mi4code.c -lgcrypt
• ./mi4code decrypt -s PP5022.MI4 OF.bin
• arm-elf-objdump -D --target binary  -Mforce-thumb -marm  OF.bin > OF.bin.thumb.txt

Links

• http://www.rockbox.org/twiki/bin/view/Main/SansaE200Install
• http://forums.rockbox.org/index.php?topic=3225.0 - port development discussions
• http://www.anythingbutipod.com/forum/forumdisplay.php?f=51 - anythingbutipod
• Other plugins I wrote for RockBox

-- MatthiasWientapper - 25 Jan 2007