Hi Yannik,
Are you using SWD interface? I see J-LInk/Trace setting in your code posted above.
I use Segger J-Link for JTAG purpose. Long back I used to get such errors
"Failed to get CPU status after 4 retries. Retry?"
When I installed latest segger dll (from the path below), I do not get such errors now. Before connecting to debug session, I run the J-Link commander from it.
http://www.segger.com/jlink-software.html
Also, make sure that you have installed latest IAR version and ADSP-CM40x Enablement software package. I ran this code with BMODE set to 3, since I instructed the code to execute SRAM and not from SPI flash (by using no-flash.icf file).
Hope someone from Tools team able to comment better on this.