Fwd: anyone can help me about nand_get_flash_type

Fwd: anyone can help me about nand_get_flash_type

[Tony Wan]

Anyone can help me with this problem? even some ideas how to debug and
find the problem? Thank you!


---------- Forwarded message ----------
From: Tony Wan <visual2me@gmail.com>
Date: Wed, Aug 25, 2010 at 5:36 PM
Subject: anyone can help me about nand_get_flash_type
To: linux-mtd@lists.infradead.org


Hi there,

I got an ARM device from Marvell with a NAND rom, running Linux
2.6.22.18. These days I'm working on upgrading the kernel to 2.6.31.8.
After the upgrade, all devices work well except the NAND rom. I found
it's because that the device and manufacturer IDs cannot be retrieved
correctly in nand_get_flash_type.  In 2.6.22.18, the IDs can be
retrieved as expected; but in 2.6.31.8, the IDs always be 0, which
leads to an error in nand_scan.

I'm a definitely newbie with MTD, and currently have no idea about the
problem. Except IO_ADDR_R & IO_ADDR_W are remapped to different
addresses, I can't find any differences between the 2 versions from
the system log -- may it be the reason? Anyone can give me some tips
about this problem -- how to fix it or how to debug? Any suggestions
will be appreciated.

--
Best regards,
Tony Wan



-- 
Best regards,
Tony Wan

Re: Fwd: anyone can help me about nand_get_flash_type

[Justin P. Mattock]

On 09/06/2010 11:37 PM, Tony Wan wrote:
> Anyone can help me with this problem? even some ideas how to debug and
> find the problem? Thank you!
>
>
> ---------- Forwarded message ----------
> From: Tony Wan<visual2me@gmail.com>
> Date: Wed, Aug 25, 2010 at 5:36 PM
> Subject: anyone can help me about nand_get_flash_type
> To: linux-mtd@lists.infradead.org
>
>
> Hi there,
>
> I got an ARM device from Marvell with a NAND rom, running Linux
> 2.6.22.18. These days I'm working on upgrading the kernel to 2.6.31.8.
> After the upgrade, all devices work well except the NAND rom. I found
> it's because that the device and manufacturer IDs cannot be retrieved
> correctly in nand_get_flash_type.  In 2.6.22.18, the IDs can be
> retrieved as expected; but in 2.6.31.8, the IDs always be 0, which
> leads to an error in nand_scan.
>
> I'm a definitely newbie with MTD, and currently have no idea about the
> problem. Except IO_ADDR_R&  IO_ADDR_W are remapped to different
> addresses, I can't find any differences between the 2 versions from
> the system log -- may it be the reason? Anyone can give me some tips
> about this problem -- how to fix it or how to debug? Any suggestions
> will be appreciated.
>
> --
> Best regards,
> Tony Wan
>
>
>


in this case if 2.6.22 worked and 2.6.31 is broken Id suggest bisecting 
this, since you have a good/bad starting point.
http://linux.yyz.us/git-howto.html

Justin P. Mattock