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DM8168 DVR cannot get u-boot to work from SD card

Hello,
I just received the DM8168 DVR reference kit and was following the quick start guide to get the RDK demo applications running.  However, during the updating of the NAND u-boot, I got interrupted, the power cut (after the u-boot NAND was erased) and now nothing is output on the serial port when powered on.

I am trying to re-flash u-boot onto the NAND using an SD card.  I followed the procedure for partitioning and copying the files to the SD card as outlined here:

http://processors.wiki.ti.com/index.php/DM816x_C6A816x_AM389x_PSP_U-Boot#Setting_Up_Boot_Environment_on_SD_Card

The SD card partitioned and the files were copied.  Now when I power on the DM8168 DVR, I get the following on the serial port:

U-Boot 2010.06 (Feb 07 2012 - 17:58:10)

DRAM: 2 GiB
Using default environment

MMC: OMAP SD/MMC: 0
Hit any key to stop autoboot: 0
raise: Signal # 8 caught
** Can't read from device 0 **

** Unable to use mmc 0:1 for fatload **
## Starting application at 0x80800000 ...

I believe that the u-boot.bin file is not being read.
According to the DM8168_DVR_RDK_Install_Guide section 1.5.2.1, should use the pre_built/bin/sd/u-boot.bin. This was not included in the package, so
I tried using a couple other u-boot.bin files that I found but both have the same result. 
Questions:
1. Am I right in assuming that the problem is with the u-boot.bin file?
2. Where can I find a pre-built u-boot.bin file for use on a SD card for the DM8168 DVR?

Thanks in advance.