A basic hardware probe to determine if you should change the default serial ordering in grub.conf. This pre-supposes that you know your hardware is broken. You can tell something is wrong with your hardware if it takes lots of time to iterate through the “Press a key” option and present you with the grub menu. In some cases, I’ve seen this take as long as 20 minutes.
#!/bin/sh
#
#
# We need to modify the order of the --serial line in grub
# in order to fix silly hardware bugs. In some cases, having
# this in the wrong order causes grub to take an inordinate
# amount of time to do anything before it actually auto-picks
# the default menu option to boot.
#
PATH=/bin:/usr/bin:/sbin:/usr/sbin; export PATH
# let's figure out what product type this is
os=`uname -s`
productname="product-no-dmidecode"
if [ $os = "Linux" ] ; then
productname=`dmidecode -s system-product-name 2>&1`
case $productname in
"PowerEdge M600")
echo "console serial"
;;
*)
echo "serial console"
;;
esac
fi
if [ $os = "SunOS" ] ; then
# Bcfg2 server is unhappy with null output from probes
echo "console"
fi