mtd_oobtest fails with GPMI-NAND

[Vikram Narayanan]

Hello Huang,

On 1/21/2013 7:42 AM, Huang Shijie wrote:
> 于 2013年01月19日 00:52, Vikram Narayanan 写道:
>> Hi,
>>
>> When I try to run the mtd_oobtest on an i.Mx6Q board, it results in a
>> failure with the following error.
>> I'm using 3.5.7 Kernel.
>>
>> root at freescale:/# insmod mtd_oobtest.ko dev=6
>> [ 7534.508880]
>> [ 7534.511228] =================================================
>> [ 7534.518460] mtd_oobtest: MTD device: 6
>> [ 7534.523000] mtd_oobtest: MTD device size 304087040, eraseblock size
>> 262144, page size 4096, count of eraseblocks 1160, pages per
>> eraseblock 64, OOB size 128
>> [ 7534.539301] mtd_oobtest: scanning for bad eraseblocks
>> [ 7534.545345] mtd_oobtest: scanned 1160 eraseblocks, 0 are bad
>> [ 7534.552482] mtd_oobtest: test 1 of 5
>> [ 7534.556797] mtd_oobtest: erasing whole device
>> [ 7537.523540] mtd_oobtest: erased 1160 eraseblocks
>> [ 7537.528888] mtd_oobtest: writing OOBs of whole device
>> [ 7537.534704] mtd_oobtest: error: writeoob failed at 0x0
>> [ 7537.540562] mtd_oobtest: error: use_len 0, use_offset 0
>> [ 7537.546565] mtd_oobtest: error -22 occurred
>> [ 7537.551456] =================================================
>>
>> This boils down to the fake "struct nand_ecclayout" defined in
>> <drivers/mtd/nand/gpmi-nand/gpmi-nand.c>
>>
>> Is there a way to run this test successfully?
> The gpmi-nand may use all the oob. So the oobtest may fails.

I'm in receipt of the error mentioned in [1]. The FAQ also suggests to 
run mtd_tests. mtd_oobtest might give more information on whether or not 
the NAND driver is buggy.

Since I couldn't run this test on gpmi-nand due to the driver design, 
any ideas on how do I resolve the "ubi_io_read: error -74 (ECC error)" 
while mounting my UBIFS?

Thanks,
Vikram

[1] http://www.linux-mtd.infradead.org/faq/ubi.html#L_ecc_error