JFFS2 ECC options

JFFS2 ECC options

[Davide CASCONE]

I'm working with JFFS2 on a NAND device. In order to disable the software ECC is it enough to set the mtd field "nand.eccmode" to "NAND_ECC_NONE"? 
If I do this, I have some CRC errors if JFFS2 file system includes a bad block. Is it right? Does the CRC check depend on the ECC options?

In order to use the summary support, is it enough to set the macro "CONFIG_JFFS2_SUMMARY" in the file ".config"? Do I have to re-make the file system image (that I create using the mkfs.jffs2 utility) in order to use it with the summary support?

Thanks in advance,
Davide

Re: JFFS2 ECC options

[Justin Treon]

> I'm working with JFFS2 on a NAND device. In order to
> disable the software ECC is it enough to set the mtd
> field "nand.eccmode" to "NAND_ECC_NONE"? 
> If I do this, I have some CRC errors if JFFS2 file
> system includes a bad block. Is it right? Does the
> CRC check depend on the ECC options?
> 
> In order to use the summary support, is it enough to
> set the macro "CONFIG_JFFS2_SUMMARY" in the file
> ".config"? Do I have to re-make the file system
> image (that I create using the mkfs.jffs2 utility)
> in order to use it with the summary support?
> 

I have no idea about your first question.  You may
want to ask it again.  

Regarding summary support I have never been able to
make a jffs2 filing system that used summary support
with the mkfs.jffs2 tool that worked.  I create the
filing system with summary support on an empty chip
and then transfer the files. Please let me knhwo if
you get it to work with the mkfs.jffs2 tool.

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Re: JFFS2 ECC options

[dedekind]

>I have no idea about your first question.  You may
>want to ask it again.  
>
>Regarding summary support I have never been able to
>make a jffs2 filing system that used summary support
>with the mkfs.jffs2 tool that worked.  I create the
>filing system with summary support on an empty chip
>and then transfer the files. Please let me knhwo if
>you get it to work with the mkfs.jffs2 tool.

Yeah, it makes a lot of sense not integrate the "sumtool" stuff
and mkfs.jffs2.

Nevertheless, it would prabably be nice if you sent a bugreport if
it doesn't work.

Artem.