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RTOS/TM4C123BE6PZ: Custom board: BIOS_start crashes application (loader_exit gets called)

Part Number: TM4C123BE6PZ

Tool/software: TI-RTOS


I try to implement a TI-RTOS on a custom board with a TM4C123BE6PZ. 

What I do is the following: I take the empty_min Example of the   EK-TM4C123GXL from the Resource Explorer. I change the target device to my processor. 

Build the project and debug it. As soon the BIOS_Start function is called, the loader_exit() is called. (see the calling trace in the attachment).

I even tried to comment the GPIO Init function and gpiowrite and toggle, so that only the basic things: Create the task and and schedule the task, should work, but with no effort.

The calling trace goes from 0xfffffffc (no symbols are defined) right to Hwi_excHandler.

I use Code composer studio v7. I attached the project, which will go right into the error.

I hope you can give me a hint, what else needs to be changed to get it working, that at least the bios is starting and the task is running.

I'm a little bit desperate, cause I'm trying to get it working now for a week...