Hi, Eric
It is confirmed that the hanging came from the C6678 PDK(v1.1.0.1) that I mistakenly used. After I updated CCS to v5.4 and MCSDK to 2.1.2.6, c6678 PDK to 1.1.2.6. they together work with NDK 2.22.3.20 perfectly. The bandwidth I got matches the one that you have posted.
The problem now can be marked solved. Thank you for following my post during last week and providing us the keys to solve the problem. By solving this problem. we can continue our R&D on the C6678 board soon.
Have a good weekend. and I know I will :P