Hi, The oobtest case uses raw NAND read/writes to OOB area bypassing the error correction mechanism and hence is bound to be affected by bitflip errors which are normal in NAND memories. (e.g. we can never get DRA7-evm's NAND to fully pass mtd_oobtest).
In these patches we add a module parameter "bitflip_limit" to specify how many bitflips per page are tolerable. Not specifiing the parameter defaults to old behaviour (i.e. zero bitflips tolerated). Specifying bitflip_limit=1 makes us pass on DRA7-evm with 0 errors. Introduce a new memcmpshow() function that shows the data byte where comparison failed. This is useful for debugging. The same function is also used to calculate number of bitflip errors over the data block. cheers, -roger Roger Quadros (2): mtd: mtd_oobtest: Show the verification error location and data mtd: mtd_oobtest: add bitflip_limit parameter drivers/mtd/tests/oobtest.c | 77 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 64 insertions(+), 13 deletions(-) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
