booting in minicom.

I m following this guide:

http://processors.wiki.ti.com/index.php/Installing_RR_free_SDK_for_Leopard_Board

All the commands uptill make install complete successfully but after that when we run boot command in minicom, We are getting this output

                                                                                                
DM355 LEOPARD # AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0                                                
syntax error                                                                                    
DM355 LEOPARD # boot                                                           
                                                                               
Loading from nand0, offset 0xc0000                                             
** Unknown image type                                                          
DM355 LEOPARD #                                                                

                                                                               
It seems that the kernel image cannot be read . Please suggest a solution for this .

Thanks in advance.