openwrt 提示 nand_correct_data: uncorrectable ECC error 这算是有坏块么

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Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.411135] blk_update_request: I/O error, dev mtdblock0, sector 0
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.417506] __nand_correct_data: uncorrectable ECC error
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.422842] blk_update_request: I/O error, dev mtdblock0, sector 8
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.429200] __nand_correct_data: uncorrectable ECC error
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.434535] blk_update_request: I/O error, dev mtdblock0, sector 16
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.441072] __nand_correct_data: uncorrectable ECC error
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.446440] blk_update_request: I/O error, dev mtdblock0, sector 24
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.453297] __nand_correct_data: uncorrectable ECC error
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.458670] blk_update_request: I/O error, dev mtdblock0, sector 0
Tue Sep 22 19:34:40 2015 kern.err kernel: [21356.464882] Buffer I/O error on dev mtdblock0, logical block 0, async page read

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error Sep 19:34:40 Tue