Info Catalog grub2: General commands grub2: terminal_input

grub2: serial

 
 16.2.1 serial
 -------------
 
  -- Command: serial ['--unit=unit'] ['--port=port'] ['--speed=speed']
           ['--word=word'] ['--parity=parity'] ['--stop=stop']
      Initialize a serial device.  UNIT is a number in the range 0-3
      specifying which serial port to use; default is 0, which
      corresponds to the port often called COM1.  PORT is the I/O port
      where the UART is to be found; if specified it takes precedence
      over UNIT.  SPEED is the transmission speed; default is 9600.  WORD
      and STOP are the number of data bits and stop bits.  Data bits must
      be in the range 5-8 and stop bits must be 1 or 2.  Default is 8
      data bits and one stop bit.  PARITY is one of 'no', 'odd', 'even'
      and defaults to 'no'.
 
      The serial port is not used as a communication channel unless the
      'terminal_input' or 'terminal_output' command is used (
      terminal_input, terminal_output).
 
      See also Serial terminal.
 

Info Catalog grub2: General commands grub2: terminal_input