Use the kernel + modules from the image mentioned here instead:
http://www.handhelds.org/hypermail/h2200-port/36/3623.html
How do i interrupt the autoboot? It says You may press a key to
interrupt autobooting the target kernel. - I pressed and still seeing
the LAB logo. And i only have USB cradle, no serial cable. No lab for me? :)
A serial cable is required in order to interact with LAB. But since
you're using a rootfs on CF and (presumably) the newest LAB, you
should be able to do what you need with the labrun you mentioned
earlier.
Matt