Forum Post: AM335X NAND(8bit) ECC Error

Hi all,
     I've been trying to modify bootloader in Starterware_02_00_01_01, and i find a bug when i read the flash,my test code is attached bellow. The bugs lay in the function "NANDPageRead", when it is called, it reaches a error value "NAND_STATUS_READ_ECC_UNCORRECTABLE_ERROR" which returned by GPMCBCHECCCheckAndCorrect() called by "NANDPageRead".

The location of the bug when step into the function in my test code is :
NANDPageRead -> GPMCNANDECCCheckAndCorrect  -> GPMCBCHECCCheckAndCorrect -> ELMErrLocProcessingStatusGet  -> produce an error named "NAND_STATUS_READ_ECC_UNCORRECTABLE_ERROR"

void NandReadTest(void)
{
     unsigned char blkdata[2048],eccdata[64];
     NandStatus_t retVal;
     NandInfo_t *nandInfo;
     unsigned int currBlock = 128;

     BlPlatformNANDSetup();
     nandInfo = BlNANDConfigure();

     while (NANDBadBlockCheck(nandInfo, currBlock) != NAND_BLOCK_GOOD)
     {
          currBlock++;// ignore bad block
     }

     if(currBlock > 2048)while(1);// error loop, the max block number is 2047

     retVal = NANDPageRead(nandInfo,currBlock,0,blkdata,eccdata);// The bug existed here,and return value  is   

                                                                                             // "NAND_STATUS_READ_ECC_UNCORRECTABLE_ERROR"
     if(retVal != NAND_STATUS_PASSED)
     {
          while(1);// Loop here caused by the bug!
     }

}

I am confused by this bug,and not clear how to correct it,so any help will be appreciated,Thanks!