serial=0,9600n8
==== grub ====
===== Kernel console =====
Add the following kernel boot parameters in your bootloader
console=ttyS0,9600
===== getty =====
Add the following line in ///etc/inittab//
S0:2345:respawn:/sbin/getty -L ttyS0 9600 vt100
And if you want to be able to log on directly as root in the console, please think to add
//ttyS0// in ///etc/securetty//