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[lik]

The Linux kernel accepts certain 'command-line options' or 'boot time parameters' at the moment it is started. In general this is used to supply the kernel with information about hardware parameters that the kernel would not be able to determine on its own, or to avoid/override the values that the kernel would otherwise detect.

Taken from:

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man bootparam

'panic=N'
By default the kernel will not reboot after a panic, but this option will cause a kernel reboot after N seconds (if N is greater than zero). This panic timeout can
also be set by "echo N > /proc/sys/kernel/panic".

Also you can disable or enable SELinux at boot time with the help of kernel boot time parameters:
selinux=0 disable selinux
selinux=1 enable selinux

For example (/boot/grub/grub.conf):

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default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-238.12.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-238.12.1.el5 ro root=/dev/md1 panic=40 selinux=0
        initrd /initrd-2.6.18-238.12.1.el5.img