add UART on Blinky project

Hi,

I am new in Synegy S7G2 board.  I created a demo code using Blinky example, it run good and blink the 3 LEDs at 2Hz rate.

But if I add a new UART thread, enable the TX/RX/transmit end interrupt -> generate Project content, build the project, then the main.c no longer call the hal_entry.c routine, LED will not blink anymore. 

main.c just enter tx_kernel_enter ();

So where is the main routine going? 

Thanks!