Perhaps we should set up a way that people can request images with any of
the corresponding u-boot bits dd'd on to each image. Note that I'm not
volunteering extra work for Jared at http://www.invisible.ca/arm/, but
something like that with the pull-downs to select an image with the proper
u-boot would probably help a lot of people.
That is exactly what that URL does - it takes the images created on the
NetBSD auto build cluster, patches the proper u-boot into them (according
to your selection on the page) and gives you the resulting ready-to-boot
image.