linux-kernel - Re: [PATCH] Make the mtdblock read/write skip the bad nand sector

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Message-ID: <CACQ1gAi26WeiopptcZmBp6h0a5TacLo5mvVCOm6-H_1HtnwvXg@mail.gmail.com>
Date:	Mon, 25 Nov 2013 11:23:14 +0100
From:	Richard Genoud <richard.genoud@...il.com>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Hans Zhang <zhanghonghui@...ofidei.com>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	zhouguangming@...ofidei.com
Subject: Re: [PATCH] Make the mtdblock read/write skip the bad nand sector

2013/11/25 Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>:
> On Mon, Nov 25, 2013 at 09:29:11AM +0800, Hans Zhang wrote:
>> On 2013/11/22 19:45, Ezequiel Garcia wrote:
>> >> Thanks for your reply.
>> >> This is for my embed system upgrade, I reserved one nand partition for filesystem
>> >> environment which will load to DDR while uboot booting.
>> >> This filesystem.uboot file should be able to read both by uboot and kernel, and
>> >> maybe written by uboot and kernel. There will be no filesystems upon the nand in
>> >> case the loader may not support some filesystem types while uboot booting.
>> >>
>> >> Seems that the trimmed environment of OS has get rid of the mtd-tools, So the dd
>> >> command was the most convenience tools to use by hand.
>> >>
>> > I still don't understand why are you using mtdblock. Why can't you write
>> > through the char device?
>>
>> Well, yes, write through the char device would be a solution.
>
> But, *why* are you writing through mtdblock instead?
>
>> I think that maybe it's an optional approach through mtdblock in case we do not have
>> the mtd-tools in our environments, we do provider a simpler way to write the NAND
>> through mtdblock.
>>
>
> Uh? simpler? Writing through mtdchat is as simple as it gets:
>
>   $ cat some_file.img > /dev/mtd0
>
> Sorry, but I'm still confused at what are you trying to accomplish.
I think that what Hans wants to do is:
 $ cat some_file.img > /dev/mtd0
And that doesn't fail on a bad block but jumps over it.
... Which is a bad idea.
But, likeyou, I didn't figured out why mtdblock instead of mtdchar.
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