debug message not ouput in serial 5

Hi guys,

when I connect TTL usb-serial line to PC, the bring up message can print on screen.

but when I add print statement "hal.console->printf_P()" in file control_poshold.cpp(or any file in ArduCopter directory), the message didn't show on screen.

Am I correct to use "hal.console->printf_P()"?

Thanks.

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