cat: /dev/ttyS0: Input/output error

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I am unable to write to or read from /dev/ttyS0



# cat /dev/ttyS0 
cat: /dev/ttyS0: Input/output error


the device exists, and root has permissions.



# ls -lAhF /dev/ttyS0
crw------- 1 root root 4, 64 Nov 18 12:09 /dev/ttyS0

# setserial -g /dev/ttyS0 
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

# dmesg | egrep -i 'serial|ttys'
[ 1.243271] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[ 2703.151301] ttyS0: LSR safety check engaged!

# cat /proc/devices | grep tty 
 4 tty
 4 ttyS
 5 /dev/tty


I have serial enabled in my kernel:



# grep SERIAL config
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_NR_UARTS=1
CONFIG_SERIAL_8250_RUNTIME_UARTS=1
CONFIG_SERIAL_CORE=y


What do I have to do to make serial work ?




kernel tty serial-port




share|improve this question
























    up vote
    3
    down vote

    favorite












    I am unable to write to or read from /dev/ttyS0



    # cat /dev/ttyS0 
    cat: /dev/ttyS0: Input/output error


    the device exists, and root has permissions.



    # ls -lAhF /dev/ttyS0
    crw------- 1 root root 4, 64 Nov 18 12:09 /dev/ttyS0

    # setserial -g /dev/ttyS0 
    /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

    # dmesg | egrep -i 'serial|ttys'
    [ 1.243271] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
    [ 2703.151301] ttyS0: LSR safety check engaged!

    # cat /proc/devices | grep tty 
     4 tty
     4 ttyS
     5 /dev/tty


    I have serial enabled in my kernel:



    # grep SERIAL config
    CONFIG_SERIAL_8250=y
    CONFIG_SERIAL_8250_NR_UARTS=1
    CONFIG_SERIAL_8250_RUNTIME_UARTS=1
    CONFIG_SERIAL_CORE=y


    What do I have to do to make serial work ?




    kernel tty serial-port




    share|improve this question






















      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      I am unable to write to or read from /dev/ttyS0



      # cat /dev/ttyS0 
      cat: /dev/ttyS0: Input/output error


      the device exists, and root has permissions.



      # ls -lAhF /dev/ttyS0
      crw------- 1 root root 4, 64 Nov 18 12:09 /dev/ttyS0

      # setserial -g /dev/ttyS0 
      /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

      # dmesg | egrep -i 'serial|ttys'
      [ 1.243271] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
      [ 2703.151301] ttyS0: LSR safety check engaged!

      # cat /proc/devices | grep tty 
       4 tty
       4 ttyS
       5 /dev/tty


      I have serial enabled in my kernel:



      # grep SERIAL config
      CONFIG_SERIAL_8250=y
      CONFIG_SERIAL_8250_NR_UARTS=1
      CONFIG_SERIAL_8250_RUNTIME_UARTS=1
      CONFIG_SERIAL_CORE=y


      What do I have to do to make serial work ?




      kernel tty serial-port




      share|improve this question












      I am unable to write to or read from /dev/ttyS0



      # cat /dev/ttyS0 
      cat: /dev/ttyS0: Input/output error


      the device exists, and root has permissions.



      # ls -lAhF /dev/ttyS0
      crw------- 1 root root 4, 64 Nov 18 12:09 /dev/ttyS0

      # setserial -g /dev/ttyS0 
      /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

      # dmesg | egrep -i 'serial|ttys'
      [ 1.243271] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
      [ 2703.151301] ttyS0: LSR safety check engaged!

      # cat /proc/devices | grep tty 
       4 tty
       4 ttyS
       5 /dev/tty


      I have serial enabled in my kernel:



      # grep SERIAL config
      CONFIG_SERIAL_8250=y
      CONFIG_SERIAL_8250_NR_UARTS=1
      CONFIG_SERIAL_8250_RUNTIME_UARTS=1
      CONFIG_SERIAL_CORE=y


      What do I have to do to make serial work ?





      kernel tty serial-port





      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 18 '17 at 12:08









      Martin Vegter

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