mtd_oobtest fails with GPMI-NAND

[Vikram Narayanan]

Hello Stefan,

On 5/8/2013 8:03 PM, Stefan Roese wrote:
> Hi Vikram,
>
> I might be seeing something similar on my iMX6 board. Here
> mtd_subpagetest sometimes fails.

AFAIR, subpagetest passed for me when I tested.

BTW, What kind of errors are you getting? Any logs?

>
> What is the current status on your platform? Did you resolve this
> problem? If yes, what did you have to change/fix?

Unfortunately no. I haven't got enough time to look into this.
Also, I don't have enough spare boards to sacrifice it for mtd_torture test.

Regards,
Vikram

> On 02/02/2013 07:41 AM, Vikram Narayanan wrote:
>> On 1/30/2013 7:57 AM, Huang Shijie wrote:
>>> 于 2013年01月30日 00:28, Vikram Narayanan 写道:
>>>> On 1/29/2013 8:06 AM, Huang Shijie wrote:
>>>>>> May I know in what way the driver is restricted for using with other
>>>>>> boards?
>>>>> The devicetree. Please check the dts file in arch/arm/boot/dts/.
>>>>> If there is no dts file for your board, the gpmi will not works very
>>>>> well for your board.
>>>>> for example, there is arch/arm/boot/dts/imx6q-arm2.dts for the MX6Q-ARM2
>>>>> board.
>>>>
>>>> I've a valid dts file for my board which is good enough to probe the
>>>> Toshiba NAND on-board and mount a UBIFS filesystem.
>>> could you tell the dts file for your board?
>>> are you sure the pinmux settings are right?
>>
>> I'm using the same pinumx settings mentioned in the file
>> "arch/arm/boot/dts/imx6q.dtsi". Hope that is right.
>>
>>>>
>>>>>> You're right and we knew it earlier as the Kernel detects the OOB size
>>>>>> as 128 bytes. So, some remaining bytes become unused at the end of
>>>>>> each page. i.e., (224-128). Instead of supporting ecc strength as ECC9
>>>>>> we end up using ECC8. Should this be a cause for the -74 error?
>>>>> no. this is not the cause. even you get the wrong geometry of the nand
>>>>> chip. the gpmi still can works.
>>>>>
>>>>> I think the root cause is the devicetree issue as above.
>>>>
>>>> Something else is causing the issue. Can you give some other pointers
>>>> which can potentially cause this -74 error while mounting?
>>> the -74 error is the EBADMSG, it's caused by the uncorrectable ECC failure.
>>> There are many reasons can cause this error:
>>>      [1] the pinmux setting is not right, the gpmi does not works well.
>>
>> As said above, my pinmux settings are right. GPMI detects my NAND, does
>> read/write/erase/mount. At times I'm seeing this -74 issue. Sometimes
>> this error goes off in the next reboot.
>>
>>>      [2] the wrong setting of BCH. for example, the page size is 8K, you
>>> set 4k to BCH.
>>>          so you can set the correct nand geometry parameters for your
>>> nand chip firstly, and then do the debug.
>>
>>   From the driver I understood that the geometry are determined according
>> to the data from the read_id bytes. mtd layer detects my NAND as 4K
>> page-sized. So, this shouldn't be a problem I guess.
>>
>>>      [3] timings.
>>
>> Should I tweak something specific according to the NAND device that I
>> have? Can you give more hints please?
>>
>> Thanks,
>> Vikram
>>
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