KarkomaOnline » Grub http://www.karkomaonline.com a Blog for SysAdmins and Unix stuff in general Thu, 25 Nov 2010 07:49:58 +0000 en hourly 1 http://wordpress.org/?v= Serial terminal support in GRUB http://www.karkomaonline.com/index.php/2008/02/serial-terminal-support-in-grub/ http://www.karkomaonline.com/index.php/2008/02/serial-terminal-support-in-grub/#comments Sat, 09 Feb 2008 08:45:13 +0000 karkoma http://www.karkomaonline.com/index.php/2008/02/09/serial-terminal-support-in-grub/ In some situations it is very useful to have the possibility to access the GRUB boot menu from a serial line. For example you could remotely reboot your machine with the new kernel you just compiled.

In my case I have a couple of remote machines linked together by a serial cable. I can log into machine A via ssh and get the Grub menu of machine B through minicom. Thus I can boot whatever OS/kernel I want as if I were in front of the machine. Kind of KVM IP for the rest of us.

Simply add this to Grub’s menu.lst:

serial –unit=0 –speed=9600 –word=8 –parity=no –stop=1
terminal serial

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