Hardware, Software and Firmware for a Raspberry Pi to DBT-03 adapter
On the Raspberry PI check out this repository.
Install the packages in install-packages.sh (run it as root).
Enable spi with raspi-config.
Change the baudrate of the programmer "linuxspi" to a smaller value 40000 is OK. This setting is found in /etc/avrdude.conf
This currently is still incomplete.