Xen 3.3 domU console doesn't work.

[Lagrange Marc <markocpc%gmail.com@localhost>]

Hi.

I'm experiencing a small problem, the guest console doesn't work, the
input seems work but display nothing.

Software :
Host:
# uname -a
NetBSD chouffe 5.0_STABLE NetBSD 5.0_STABLE (XEN3_DOM0) #0: Wed Oct  7
05:34:50 UTC 2009
builds%b7.netbsd.org@localhost:/home/builds/ab/netbsd-5/amd64/200910070000Z-obj/home/builds/ab/netbsd-5/src/sys/arch/amd64/compile/XEN3_DOM0
amd64
# xm dmesg|grep "Xen version"
(XEN) Xen version 3.3.2 (root@) (gcc version 4.1.3 20080704 prerelease
(NetBSD nb2 20081120)) Sun Oct 11 12:30:22 CEST 2009

DomU:
OpenBSD poissonpikant 4.5 GENERIC#2052 amd64

Configs:
Host:
# grep -v '^$' /usr/pkg/etc/xen/silc.conf
kernel = "/usr/pkg/lib/xen/boot/hvmloader"
builder = 'hvm'
memory = 128
device_model = '/usr/pkg/libexec/qemu-dm'
name = "silc"
vif = [ 'type=ioemu, bridge=bridge0, model=e1000' ]
disk = [ 'file:/usr/xen/silc.img,hda,w' ]
boot = 'c'
vncconsole=0
serial='pty'
localtime=1
audio=0
vnc = 1
vnclisten = "42.42.42.42"

DomU:
# cat /etc/boot.conf
set tty com0
stty com0 9600
# grep tty00 /etc/ttys
tty00   "/usr/libexec/getty std.9600"   vt220   on secure

Problem:
Same here : http://mail-index.netbsd.org/port-xen/2008/08/17/msg004126.html
I've updated from pre-compiled binary (3.3.1) to pkgsrc (3.3.2) -> same problem.

Any ideas to get console working ?