On Wednesday 23 May 2012 04:30:26 Patrick wrote:
> Hello all,
>
> I am using yaffs2-7862c13 on a Linux 3.3 kernel on ARM (omap4).
> When writing to the yaffs2 partition I could never write more than
> approximatively half the size of the partition after the partition looks
> like full.
>
> Then if I try to erase the partition with flash_erase I have many
> (approx. half of the partition) badblocks that I could never revert.

There should be a way to flash_erase scrubbing bad blocks.


>
> I have tried exactly the same manipulation on the same hardware with the
> same kernel (but with a new flash) using jffs2 instead of yaffs2 and I
> have not this problems of badblocks.
>
> The flash is a 1Gb with 2048 bytes blocks.

Please send the output from 

cat /proc/yaffs
cat /proc/mtd

>
> Do you have any idea why ?

First off did you start with an erased partition?

If you started with an erased partition and a whole lot of bad blocks are 
generated when you write then the most likely cause is that your NAND driver 
is broken in some way and is writing tags over the bad block markers.

One way to check that is to use yaffs2 with inband tags. That does not write 
tags to the oob area and will thus sidestep problems like this.

mount -t yaffs2 -o"inband-tags" ...

> How could I revert the badblocks markers ?
>
> Thanks for your help.
>
> Patrick
>
>
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