[CentOS] Strange message at boot time

Hi,

I'm usually booting all machines here with 'vga=788 quiet' options in 
menu.lst, so I see what services start, but it's not too verbose at the 
same time.

One message that puzzles me is the very first one after GRUB starts init:

"Memory for crash kernel (0x0 to 0x0) notwithin permissible range."

Anyone knows what that means?

Niki