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Date: Tue, 29 Jan 2013 07:56:59 +0530
From: Vikram Narayanan <vikram186@gmail.com>
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To: Huang Shijie <b32955@freescale.com>
Subject: Re: mtd_oobtest fails with GPMI-NAND
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On 1/29/2013 7:36 AM, Huang Shijie wrote:
> 于 2013年01月29日 01:04, Vikram Narayanan 写道:
>> On 1/28/2013 8:50 AM, Huang Shijie wrote:
>>> 于 2013年01月28日 10:39, Vikram Narayanan 写道:
>>>> 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
> Which mx6q' board are you using? the mx6q-arm2 or mx6q-ard?

I'm using a custom board.

> The kernel only supports the mx6q-arm2 now.

May I know in what way the driver is restricted for using with other boards?

>>
>> Toshiba, 4 Gbit, (4096 +224) bytes ×64 pages ×2048blocks
>
> The Toshiba's nand is not well supported by the kernel.
> Are you sure the kernel parse out the correct geometry for the toshiba's
> nand?
> Please recheck the page size and oob size with "mtdinfo /dev/mtd0".
>

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?

Regards,
Vikram