Hi Lars,
I realise it's been a while since your posting, but I've seen that before and may be able to help.
You don't mention which version you're using, but it sounds like you've changed to PC console for the vxWorks image by changing the Tornado/Workbench configuration. If the bootrom is built outside this configuration, you also need to define INCLUDE_PC_CONSOLE in config.h and rebuild the bootrom too.
Regards,
Tim.