fileio shell

[787562067]

HI,
    after write fileio bin by ./st-flash write /home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples/fileio/fileio.bin 0x8000000
my  computer connects to stm32f407's USART3(pd8 pd9 pin), no log outputs ,  please tell me how to interact with the shell
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