Problems with sumtool with linux-mtd 1.0

Problems with sumtool with linux-mtd 1.0

[Paolo Scaffardi]

Hi there!
I'm developing for a arm cirrus ep9302-based board target. The build
system was based on an older mtd version. I upgraded to version 1.0.
Now, it seems i have a problem using sumtool (that was never used before
by build system after creating jffs2).

I correctly made my jffs2 filesystem for my on-board flash (intel, NOR
type, 128Kb x 128 blocks) with this cmd:

mkfs.jffs2 --pad=$((8*1024*1024)) --eraseblock=$((128*1024)) -d
/opt/mydir -o image.jffs2

Then i called sumtool with:

sumtool --pad --eraseblock=$((128*1024)) --input=image.jffs2
--output=image2.jffs2

The problem is that the second images was really smaller than the first
one (384Kb).

Why that?
Sumtool dont give me any error!

Bye,
Paolo Scaffardi
GFP Lab s.r.l.
http://www.gfplab.com
fax 178 2258454

Re: Problems with sumtool with linux-mtd 1.0

[Zoltan Sogor]

Hi Paolo!

I think there is no problem with sumtool.

If you run sumtool with --pad parameter then it pads the OUTPUT file with
0xFF to the end of the last used eraseblock.

If you have empty eraseblocks at the end of your INPUT image then the 
sumtool
skips those.

Zoltan

Paolo Scaffardi wrote:
> Hi there!
> I'm developing for a arm cirrus ep9302-based board target. The build
> system was based on an older mtd version. I upgraded to version 1.0.
> Now, it seems i have a problem using sumtool (that was never used before
> by build system after creating jffs2).
>
> I correctly made my jffs2 filesystem for my on-board flash (intel, NOR
> type, 128Kb x 128 blocks) with this cmd:
>
> mkfs.jffs2 --pad=$((8*1024*1024)) --eraseblock=$((128*1024)) -d
> /opt/mydir -o image.jffs2
>
> Then i called sumtool with:
>
> sumtool --pad --eraseblock=$((128*1024)) --input=image.jffs2
> --output=image2.jffs2
>
> The problem is that the second images was really smaller than the first
> one (384Kb).
>
> Why that?
> Sumtool dont give me any error!
>
> Bye,
> Paolo Scaffardi
> GFP Lab s.r.l.
> http://www.gfplab.com
> fax 178 2258454
>
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>