Serial console
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coreboot
FILO
GRUB
In your boot/grub/menu.lst add the following:
serial --unit=0 --speed=115200 terminal --timeout=15 serial console
Change --unit=0 to --unit=1 for the second serial port (COM2).
Linux kernel command line
Add
console=ttyS0,115200 console=tty0
to send debug output to both the serial console on COM1 and to VGA.
Linux login prompt
In /etc/inittab add/enable a line like this:
T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
Change ttyS0 to ttyS1 for COM2.
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