Hello_world_small issue?

Quartus version: 9.0sp2

Nios EDS version: 9.0sp2

I met a problem which confuse me several days,when I code a simple led flashing program by hello_world_small temple,the console give me the state below,but led not flashing,I hav confirm the HW connection and RST pull high.But when I try the debug as hardware mode,it can be work step by step,but when I resume the program it seems running(view in disasemble),but PIO not working,

anyone could help me?

Console in Run As mode:

Using cable "USB-Blaster [USB-0]", device 1, instance 0x00

Pausing target processor: OK

Initializing CPU cache (if present)

OK

Downloading 00000000 ( 0%)

Downloaded 1KB in 0.0s

Verifying 00000000 ( 0%)

Verified OK

Leaving target processor paused

Console in Debug As mode:

mi_cmd_stack_list_frames: No stack.

No symbol "new" in current context.

No symbol "IOWR_ALTERA_AVALON_PIO_DIRECTION" in current context.

Single stepping until exit from function _start,

which has no line number information.