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Date: Tue, 07 Sep 2010 06:29:01 -0700
From: "Justin P. Mattock" <justinmattock@gmail.com>
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To: Tony Wan <visual2me@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: Fwd: anyone can help me about nand_get_flash_type
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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