[Fedora-xen] DomU boot on Fedora 6 fails with 'VFS: Cannot open root device'

[Anne Facq]

Hello

I have got a problem booting a DomU on Linux Fedora Core 6 (kernel 
2.6.19-1.2895.fc6xen)

I did the following operations :

1) dd if=/dev/zero of=/home/xen/vm1 bs=1k seek=6144k count=1

2) mkfs.ext3 /home/xen/vm1

3) mount -o loop /home/xen/vm1 /mnt

4) cp -ax /{root,dev,var,etc,usr,bin,sbin,lib,boot} /mnt
5) mkdir -m 755 /mnt/{proc,sys,home,tmp,mnt}

6) DomU fstab :
/dev/sdb1               /                       ext3    defaults        1 1
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
sysfs                   /sys                    sysfs   defaults        0 0


7) cat > /etc/xen/vm1
kernel = "/boot/vmlinuz-2.6.19-1.2895.fc6xen"
memory = 512
name = 'vm1'
vif = [ '' ]
disk = [ 'file:/home/xen/vm1,sdb1,w' ]
root = '/dev/sdb1 ro'
extra = 'ro selinux=0 3'

8) When I launch :
xm create -c vm1

I get the following error message :
----
VFS: Cannot open root device "sdb1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
----

I tried several devices but I got the same message

Any advice ?

Thanks in advance.

Anne Facq