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pandaboard es first time flash



for first time flashing on panda board ,it gives me message like below

Texas Instruments Inc X-Loader 1.41.0-g1b5cd555 (Aug  2 2012 - 19:08:40)        
                                                                                
OMAP4460: 1.2 GHz capable SOM                                                   
                                                                                
Could not read bootloader!                                                      
                                                                                
X-Loader hangs                           

          

As i used 4A1 1.7 pre build binaries and 

i have created 3 partition  as  give mkcard.sh v 5.0

boot

media

rootfs

i copied MLO and U-boot.bin file in boot partitions.

then i connect the sd card in panda board and try to flash but  i get above error massage.

please some one explain me the procedure for first time flash for panda board es and what is the meaning of above error message

Thanks in advance