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dm6446 nand flash got erased

DM644x initialization passed!                       
TI UBL Version: 1.50                                
Booting Catalog Boot Loader                         
BootMode = NAND
Starting NAND Copy...
Valid magicnum, 0xA1ACED66, found in block 0x00000006.
   DONE
Jumping to entry point at 0x81080000.


U-Boot 1.2.0 (Apr 13 2009 - 12:08:08)

I2C:   ready
DRAM:  256 MB
unknown vendor=0 Flash:  0 kB                                                  
NAND:  NAND device: Manufacturer ID: 0xec, Chip ID: 0x36 (Samsung NAND 64MiB 1,)
64 MiB                                                                         
In:    serial                                                                  
Out:   serial                                                                  
Err:   serial                                                                  
ARM Clock :- 297MHz                                                            
DDR Clock :- 162MHz                                                            
MSP430 Firmware supports AM/PM Feature                                         
Hit any key to stop autoboot:  0                                               
DaVinci EVM # DM644x initialization passed!                                    
TI UBL Version: 1.50                                                           
Booting Catalog Boot Loader                                                    
BootMode = NAND                                                                
Starting NAND Copy...                                                          
Valid magicnum, 0xA1ACED66, found in block 0x00000006.                         
   DONE                                                                        
Jumping to entry point at 0x81080000.                                          
                                                                               
                                                                               
U-Boot 1.2.0 (Apr 13 2009 - 12:08:08)                                          
                                                                               
I2C:   ready                                                                   
DRAM:  256 MB                                                                  
unknown vendor=0 Flash:  0 kB                                                  
NAND:  NAND device: Manufacturer ID: 0xec, Chip ID: 0x36 (Samsung NAND 64MiB 1,)
64 MiB                                                                         
In:    serial                                                                  
Out:   serial                                                                  
Err:   serial                                                                  
ARM Clock :- 297MHz                                                            
DDR Clock :- 162MHz                                                            
MSP430 Firmware supports AM/PM Feature                                         
Hit any key to stop autoboot:  0                                               
                                                                               
Loading from NAND 64MiB 1,8V 8-bit, offset 0x200000                            
   Image Name:   Linux-2.6.18_pro500-davinci_evm-                              
   Image Type:   ARM Linux Kernel Image (uncompressed)                         
   Data Size:    2018280 Bytes =  1.9 MB                                       
   Load Address: 80008000                                                      
   Entry Point:  80008000                                                      
## Booting image at 80700000 ...                                               
   Image Name:   Linux-2.6.18_pro500-davinci_evm-                              
   Image Type:   ARM Linux Kernel Image (uncompressed)                         
   Data Size:    2018280 Bytes =  1.9 MB                                       
   Load Address: 80008000                                                      
   Entry Point:  80008000                                                      
   Verifying Checksum ... OK                                                   
OK                                                                             
                                                                               
Starting kernel ...                                                            
                                                                               
Uncompressing Linux.............................................................

then gets hanged...

plz give me some hints to reboot the nand flash with kernel image..