Problem with mxc_nand driver

[Jernej Turnsek]

Hi,

after writing root fs image into nand partition, running the image and
then checking the first empty block I've got following OOB data which
is suspicious to me:

OOB:
	ff ff 85 19 03 20 ff ff
	ff 65 02 08 00 00 00 ff
	ff ff ff ff ff ff ff ff
	ff ff 03 ff ff ff ff ff
	ff ff ff ff ff ff ff ff
	ff ff 03 ff ff ff ff ff
	ff ff ff ff ff ff ff ff
	ff ff 03 ff ff ff ff ff

One can see that bytes on offset 2 to 5 are not empty and when using
the smallpage_memorybased badblock_pattern byte 6 is not FF like it
should be.

Anyone knows what is going on here?

PS: for the not empty pages all first 6 bytes are FF.

BR,
Jernej

On Mon, Sep 28, 2009 at 11:20 AM, Eric Bénard <eric at eukrea.com> wrote:
> Hi,
>
> Jernej Turnsek a écrit :
>>
>> are you using HW ECC on your chip? I suspect that HW ECC is writting
>> something into space provided for the clean markers. I will
>> investigate to.
>>
> yes, I'm using HW ECC.
> static struct mxc_nand_platform_data eukrea_cpuimx27_nand_board_info = {
>        .width = 1,
>        .hw_ecc = 1,
> };
>
> In fact, maybe the change to the NAND driver should test hw_ecc as it
> shouldn't be necessary for software ecc.
>
> Eric
>