Updated with link to KV diags image, massive thanks to j.p.s, lclrc, and MrTick for helping out with this!
Also added a link to a mirror of uboot-2014.04-lab126 - work on creating functional builds using this is almost complete so expect some Heisenberg/KT3 goodies in due course.
Finally, I've been working on a no-serial recovery/flashing solution - it's very similar to CRP but doesn't require the presence of a kernel or filesystem to function. Check out
this commit for a sneak preview of how this works on the U-Boot side of things