error boot

ls -l /boot ::
-rw-r--r-- System.map-genkernel-x86-2.6.20-gentoo-r7
lrwxrwxrwx boot -> .
drwxr-xr-x grub
-rw-r--r-- initrd-genkernel-x86-2.6.20-gentoo-r7
-rw-r--r-- kernel-genkernel-x86-2.6.20-gentoo-r7

cat /boot/grub/menu.lst

default 0
timeout 2
title=gentoo
root (hd0,1)
kernel /boot/kernel-genkernel-x86-2.6.20-gentoo-r7 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/sda2  doscsi
initrd /boot/initrd-genkernel-x86-2.6.20-gentoo-r7

and no boot, this menssage...
>> Activating mdev
>> Determining root device...
!! block device /dev/sda2 is not valid root device...
!! the root block device is unspecified or not detected.
please specify a device to bot, or "shell" for a shell...
boot() ::