JFFS/MTD and Raw access

[simon at baydel.com]

I have hit exactly the same problem using JFFS2. I am no authority 
on this but, I thought the problem might be caused by the write 
generating different OOB data for input blocks, which are erased or 
only partially written. So I guess what needs to be done is to read 
and copy the DATA and OOB. I think you can do this with the 
nanddump and nandwrite utilities. I guess I will have to try it 
sometime. 

Cheers

Simon.
On 28 Nov 2002, at 17:21, Damien GERANTON wrote:

> Hello,
> 
> I face a strange problem, i use MTD with JFFS and i want to clone my
> systeme from one card to another. I thought that some think like : dd
> if=/dev/mtd0 of=/master.img
> 
> and
> 
> dd if=/master.img of=/dev/mtd0
> 
> But it does not work, if after i do
> 
> dd if=/dev/mtd0 of=/test.img
> diff test.img master.img
> i says they are different.
> 
> Is it normal.
> 
> Is RAW acces really RAW ?
> 
> Do i miss some think ?
> 
> Thanks
> 
> PS : I use MTD on 2.2.17 kernel
> 
> 
> 
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__________________________

Simon Haynes - Baydel 
Phone : 44 (0) 1372 378811
Email : simon at baydel.com
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