You are using DVK so please make sure that your DVK has these jumpers (J101,102,103,104) between 1 and 2.
Please try with the attached image file. Let me know if you are not receiving the debug messages with that image as well.
You will get messages like "USB LOG"...
I have test it, I found the signal from J102 is not stable. Now, I know the reason why there are no info print . Thanks!