openwrt/target/image/x86/grub/menu.lst

   1 serial --unit=0 --speed=@BAUDRATE@ --word=8 --parity=no --stop=1
   2 terminal --timeout=10 serial
   3
   4 default 0
   5 timeout 5
   6
   7 title   OpenWrt
   8 root    (hd0,0)
   9 kernel  /boot/vmlinuz @CMDLINE@ noinitrd console=ttyS0,@BAUDRATE@n8
  10 boot
  11