Cannot create domU

[NAHieu <nahieu@gmail.com>]

I have a problem creating domU. Below is the error:
---
...
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Xen virtual console successfully installed as tty1
Event-channel device installed.
xen_blk: Initialising virtual block device driver
xen_blk: Timeout connecting to device!
xen_net: Initialising virtual ethernet driver.
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
NET: Registered protocol family 1
NET: Registered protocol family 17
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "hda1" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
---

The xen changeset is:  Fri Sep 23 04:59:31 2005
43edce5b75d62213991842e441f8f11a29081a


Here is my config file (I use command: "xm create -c tty.xen")
--
kernel = "/boot/vmlinuz-2.6-xenU"
memory = 64
maxmem = 90
name = "ttylinux"
disk = ['file:/home/nah/rootfs.tty,hda1,w']
root = "/dev/hda1 ro"
--


Anybody could tell me what is wrong?


Many thanks.
Hieu