[U-Boot] U-boot not finding NAND chip on imx28EVK - Gives DMA read error

[Bill]

All,

        I enabled my U-boot for NAND support for my imx28EVK and I get 
the following error when U-Boot starts:


NAND:  MXS NAND: Error sending command
MXS NAND: Error sending command
MXS NAND: DMA read error
MXS NAND: DMA read error
MXS NAND: Error sending command
...

     I am using U-boot version  U-Boot 2012.07-rc1.   I also have the 
NAND support enabled in /include/configs/mx28evk.h  by adding  
CONFIG_CMD_NAND.
     The NAND chip I am using is:  Micron  MT29F1G08ABADA.

Thanks,
Bill