Begin: Waiting for root filesystem... ...

Check root= bootarg cat /proc/cmdline
or missing modules. devices: cat /proc/modules is /dev
ALERT! /dev/hda1 does not exist. Dropping to a shell!

BusyBox v1.1.3 (Debian 1:1.1.3-3) Built-in shell (ash)
Enter 'help' for a list of built-in commands

/bin/sh: can't access tty: job control turned off
(initramfs)