I setup the grub for one hard disk image file according to
http://kbarr.net/bochs . When I runing under bochs, it reports that
"File not found". If under grub shell, I input "kernel /boot/vmlinux.*
and "initrd /boot/initrd.*" and then "boot", it will restart the boot
and still complain that "File not found". I guess it is some kind of
bug.