RE: [Yaffs] RE:Bad blocks - DMESG

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Author: Chandru
Date:  
To: 'Brad Beveridge'
CC: yaffs
Subject: RE: [Yaffs] RE:Bad blocks - DMESG
Hello Brad,

When my board is up and running, the dmesg gives me the following error.
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1
**>>Block 621 marked for retirement
**>>ecc error fix performed on chunk 19889:1 

    Why is it trying to fix the same region everytime ? What does that
number mean "chunk 19889:1" ?


When I try to run nanddump, I get Input/Output error when it encounters the
second block. I get all FF when I dump the hex content for the first block
and error when it encounters second block. 

    I will go ahead testing the first block using nandwrite as you
suggested.


I am using 2.4.19 kernel and yaffs filesystem.


Thanks,
Chandru.


-----Original Message-----
From: Brad Beveridge [mailto:brad.beveridge@gmail.com]
Sent: Tuesday, February 13, 2007 8:01 PM
To: Chandru
Cc:
Subject: Re: [Yaffs] RE:Bad blocks - DMESG

On 12/02/07, Chandru <> wrote:
> Thanks Brad.
No problem :)

> Can you suggest me a few steps for debugging this issue ? Like I would
like
> to read this nand device contents. I couldn't do it with nanddump. Is thr
> any other way to get the contents of the nand ? I would like to read a
> particular location on the nand, the contents on that particular location
?

I may have missed a previous message of yours, but you say that
nanddump doesn't work? Can you give the error output? I think
getting nanddump and nandwrite working are probably the first steps in
ensuring a working MTD nand driver.
Most (all?) NAND chips guarentee that block 0 will always be a good
block. I would start my driver debugging by using nandwrite to write
a few bytes to block 0, verify them with nanddump and then erase &
verify the block. This will test the data path to your chip via the
MTD driver.
If that step is failing, then you must get that working properly first.

Good luck!
Brad

>
> Thanks,
> Chandru.
>
>
>
> -----Original Message-----
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>
> Sent: Friday, February 09, 2007 5:31 PM
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> Subject: yaffs Digest, Vol 21, Issue 3
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 8 Feb 2007 17:05:11 -0800
> From: "Brad Beveridge" <>
> Subject: Re: [Yaffs] Bad blocks - DMESG
> To: 
> Message-ID:
>         <>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed

>
> Hi Chandru,
> Blocks on NAND chips can and do go bad, and chips often come from the
> factory with bad blocks.
> It looks like Yaffs has marked four blocks bad, which is probably to
> be expected if this is the first time you've run yaffs on this device.
> In my experience, after an initial flurry of blocks being marked as
> bad, things will settle down and blocks will stay good for a long
> time.
>
> If you can read and write files reliably to the Yaffs partition
> without excessive numbers of blocks being marked bad, then I would
> believe that you have set Yaffs up correctly.
>
> NAND drivers are often all or nothing, either it works properly, or it
> really doesn't work at all.
>
> Hope that helps,
> Brad
>
>
>
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