As can be found at the third section of the following blog entry (called "OpenOCD and CortexA8"), the iMX515 now works with OpenOCD after applying those three preliminary patches mentioned there.
Autodetection of the DAP base is still to be accomplished. Read on:
http://marex-hnd.blogspot.com/2010/10/studies-u-boot-openocd-and-cortexa8.html