problems with debug

hi everyone! i use the niosII_cyclone_1c12_eval board!

i met several problems.when i debug the program,it shows"nios2-terminal: connected to hardware target using JTAG UART on cable

nios2-terminal: "Nios II Evaluation Board [USB-0]", device 1, instance 0

nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)"

in the console!

i don't know what's wrong with my problem ,

the other question is when i printf("hello world\n") in myprogram (i have add a jtag_uart in my sopc) it runs correctly!

the only problem is in the console,the "hello world" doesnot appear!

could anyone help!