I have currently no time to work on this unfortunately. I do not have any lead to what goes wrong. It is interesting that the IAR 5.0-compiled code also fails to run. I’ll paste some short debugging notes on the wiki in case it can help or inspire someone.
EDIT: Added two tutorials to the Developer’s Corner of the DSO Nano wiki http://garden.seeedstudio.com/index.php?title=DSO_Nano. This is gonna be helpful for myself at least 