rtems-net: network sema obtain: network not initialised error

I called select function , why report this error? Hello, I'm waiting for input.. \0wait 5s select begin rtems-net: network sema obtain: network not initialised code: = int uart_recv(int fd, char *rcv_buf,int data_len) { int len,fs_sel; fd_set fs

fileio shell

HI, after write fileio bin by ./st-flash write /home/cheng/stm32f4/arm-rtems4.11/c/stm32f4/testsuites/samples/fileio/fileio.bin 0x800 my computer connects to stm32f407's USART3(pd8 pd9 pin), no log outputs , please tell me how to interact with the shell_

stm32 usart read

HI, ALL! I am new to rtems. now write the usart application by usart3 (PD8 PD9 pin) when i input a string "qqw" by port tool Hercules, i only get one char 'q' returned , so i think the read here is not like the linux read function, i dont know how to handle it, hope you could give some hints