6657EVM板烧写NAND出错

用6657EVM烧写NAND FLASH，出现下面的错误，注意标红的部分，看起来是随机错误，找不到原因
[C66xx_0] NAND Writer Utility Version 01.00.00.01
[C66xx_0]
[C66xx_0] Flashing block 1 (0 bytes of 263568)
[C66xx_0] Flashing block 2 (131072 bytes of 263568)
[C66xx_0] Flashing block 3 (262144 bytes of 263568)
[C66xx_0] Reading and verifying block 1 (0 bytes of 263568)
[C66xx_0] Failure in block 1, at byte 961, (at byte 0 in the data file) expected 0x00000000, read 0x00000000
[C66xx_0] Flashing block 1 (0 bytes of 263568)
[C66xx_0] Flashing block 2 (131072 bytes of 263568)
[C66xx_0] Flashing block 3 (262144 bytes of 263568)
[C66xx_0] Reading and verifying block 1 (0 bytes of 263568)
[C66xx_0] Failure in block 1, at byte 33, (at byte 0 in the data file) expected 0x00000080, read 0x00000080
[C66xx_0] Flashing block 1 (0 bytes of 263568)
[C66xx_0] Flashing block 2 (131072 bytes of 263568)
[C66xx_0] Flashing block 3 (262144 bytes of 263568)
[C66xx_0] Reading and verifying block 1 (0 bytes of 263568)
[C66xx_0] Failure in block 1, at byte 691, (at byte 0 in the data file) expected 0x00000000, read 0x00000000
[C66xx_0] Flashing block 1 (0 bytes of 263568)
[C66xx_0] Flashing block 2 (131072 bytes of 263568)
[C66xx_0] Flashing block 3 (262144 bytes of 263568)
[C66xx_0] Reading and verifying block 1 (0 bytes of 263568)
[C66xx_0] Failure in block 1, at byte 541, (at byte 0 in the data file) expected 0x00000080, read 0x00000080
[C66xx_0] Flashing block 1 (0 bytes of 263568)
[C66xx_0] Flashing block 2 (131072 bytes of 263568)
[C66xx_0] Flashing block 3 (262144 bytes of 263568)
[C66xx_0] Reading and verifying block 1 (0 bytes of 263568)
[C66xx_0] Failure in block 1, at byte 1069, (at byte 0 in the data file) expected 0x00000000, read 0x00000000
[C66xx_0] NAND write failed (maximum retries reached)