[U-Boot] Seeking PPC BDM resources for MPC860, docs for old MPC860 Eval Board

Hi folks! I've recently acquired two MPC860-based eval boards made by EST Corp (now part of Wind River Systems for the last handful of years), and I'm looking to get it booting Linux via u-boot.

Additionally, I'm also looking for MPC860 BDM hardware I can make on my own. Does anyone have any suggestions? I got these boards sans ANY documentation, and they have a boatload of DIP switches as well as a dozen or so jumpers scattered across the board. If someone would like a photo of the board, I'll reply with a URL.

Thanks in advance, Alex