Has anyone got ROD working with a Xen kernel?

I modified my grub.conf and boot.conf with the following:

CODE
title CentOS (2.6.18-53.1.13.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-53.1.13.el5 console=tty0 console=ttyS0,9600
        module /vmlinuz-2.6.18-53.1.13.el5xen ro root=LABEL=/1
        module /initrd-2.6.18-53.1.13.el5xen.img


I also put the console=ttyS0,9600 on the module line as below.

CODE
title CentOS (2.6.18-53.1.13.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-53.1.13.el5 console=tty0
        module /vmlinuz-2.6.18-53.1.13.el5xen ro root=LABEL=/1 console=ttyS0,9600
        module /initrd-2.6.18-53.1.13.el5xen.img


Still no go ...

My syslog is showing

CODE
Kernel command line: ro root=LABEL=/1 console=tty0 console=ttyS0,9600


so it appears to be grabbing the option.

Anyone tried this and got it working?