I'm sorry for my poor English in advance.
I use the Chinese sent a related posts in the freescale community, because too few people reply, so the use of the English language.
My PCB is the second edition, the first edition is normal. Revised second edition just modified the interface to facilitate the extraction signal lines.
My board using serial download boot and kernel, then download the file system through the way of NFS.
I use ADSToolkit to download the boot and kernel that work work normally in the first edition, and prompts successfully downloaded, but the switch to boot from nand mode, the board can not start properly. Testing found the processor reads data from the nand, but DDR did not work.