17 Re-Flashing an Arduino
Accidently I managed to use a reset method from the watchdog functionalities in the setup-routine of my Arduino code. It was reseting about 4 times per second and I was not able to upload new code.
Searching for a method to re-flash the bootloader of my Arduino, I found a very helpful and easy tutorial:
It describes how to solder a 4-pin-header to the Diecimila-board and use the so called BitBang mode of the FT232RL to burn a new bootloader without an external AVR-Writer. It also provides a program, called avrdude-serjtag (which is unfortunately only running on Windows, but ok...). So if you have a solder-iron, a windows-pc and some pin-headers and wires, you can extend your Arduino board easily to burn a new bootloader (and it's cheap!!).
So my Arduino is up and running fine again.