when�kernel�start�,display�this
Your system seems to be missing critical device filesin /dev ! �Although you may be running udev or devfs,the root partition is missing these required files !
To rectify this situation, please do the following:mkdir /mnt/fixitmount --bind / /mnt/fixitcp -a /dev/* /mnt/fixit/dev/umount /mnt/fixitrmdir /mnt/fixit
You may refer to these instructions at /etc/issue.If you previously had an issue file, it has beenbacked up at /etc/issue.devfix. �Once you've fixedyour system, you will have to restore your old issue
file in order to get rid of this warning.
Thanks for using Gentoo !

http://bugs.gentoo.org/show_bug.cgi?id=40987
i�have�done:mkdir /mnt/fixitmount --bind / /mnt/fixitcp -a /dev/* /mnt/fixit/dev/
umount /mnt/fixitrmdir /mnt/fixit--
pete_doherty