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Nandflashwrite problem on dm357

I am using dm357 platform ,

my nand device is k9k1g08,

but on the evm board,device is k9k8g08,

when I use Nandflashwriter program,I add k9k1g08 device special information under the struct nand_chip_info

but when program run to the function :LOCAL_writeHeaderAndData(.....)

run the follow program:

for(i=0;i<NAND_MAX_PAGE_SIZE;i++)

{

gNandTx[i]=0xff;

gNandRx[i]=0xff;

}

the program run dead.

why?