It turns out a "friend" nfs mounted my machine and added a couple large files. I told LTIB to leave the staging area and found the problem looking at rootfs.tmp.
I appreciate your help. I used to work in the IC design group at Thomson. We had multiple tools that cost multiple $100,000 each. Your LTIB support is better than the support for any of those tools.
----- Original Message -----
From: "Stuart Hughes" <address@hidden>
To: address@hidden
Cc: "ltib" <address@hidden>
Sent: Tuesday, June 8, 2010 6:20:20 AM GMT -05:00 US/Canada Eastern
Subject: Re: [Ltib] jffs2 file size suddenly doubled
Answering my own question. I did a bit more digging. I realised that
for the mpc5200, which is big endian, I need to first convert to little
endian. Here's the steps I used (for an mpc5200 jffs2 image) on a
Debian Lenny box. You may need slight adjustments for your distro.
This is adapted from the Maemo instructions:
1. As your normal user, convert the big endian jffs2 image to little endian:
/opt/ltib/usr/bin/jffs2dump -b -e rootfs.jffs2.le rootfs.jffs2
2. Become root and then associate the loopback device with the image you
just converted.
losetup /dev/loop0 rootfs.jffs2.le
3. Load the mtd modules
modprobe mtdblock
modprobe block2mtd
modprobe jffs2
4. Set the right erase block size, for the mpc5200 256 KB (note after
this, you can run "cat /proc/mtd" to check the sizes look right)
echo "/dev/loop0,256KiB" > /sys/module/block2mtd/parameters/block2mtd
5. Make a mount point (as needed)
mkdir /mnt/jffs2
6. mount the jffs2 filesystem
mount -t jffs2 /dev/mtdblock0 /mnt/jffs2
You can then examine this: (e.g. du /mnt/jffs2 | sort -n)
When you're done:
umount /mnt/jffs2/
rmmod jffs2 block2mtd mtdblock
losetup -d /dev/loop0
Regards, Stuart
Stuart Hughes wrote:
> Hi Todd,
>
> I'm not sure why your jffs2 has grown. It should be possible to mount
> your jffs2 on your host machine by following:
>
> https://wiki.maemo.org/Advanced_booting
>
> However, when I tried I end up with:
> # mount -t jffs2 -o ro /dev/mtdblock0 /tmp/jffs2
> mount: /dev/mtdblock0: can't read superblock
>
> and looking /var/log/messages, I see: "You cannot use older JFFS2
> filesystems with newer kernels"
>
> So on my machine at least, I'm not able to do this. Maybe someone else
> knows a better way? or it may work on your box.
>
> There is also /opt/ltib/usr/bin/jffs2dump, but this seems to only output
> raw data (block info).
>
> If you have the old/new BSPs around, you could look/compare the size of
> the staging area used to make the rootfs for the jffs2 (you need to
> select Target Image Generation / Options / Keep temporary staging
> directory in ./ltib -m config). This is probably your best option.
>
> Another thought is that if you have enough RAM, you may be able to boot
> your target NFS and then copy in your jffs2 image to a mtdram device,
> and then mount it (you'd need to google for details, I've not tried).
>
> Good luck and if anyone else has any ideas about this, I'd be interested
> too.
>
> NOTE: the message about "You cannot use older JFFS2 filesystems with
> newer kernels" worries me, if true, it looks like I should update
> /opt/ltib/..../mtd-utils. This is a PITA as I suspect it will break
> backward compatibility (worse, probably the older kernels would be able
> to mount jffs2 generated with a newer tool?). Does anyone have any
> insight into the change and the implications?
>
> Regards, Stuart
>
> address@hidden wrote:
>> My jffs2 file size went from 14mB to 25mB. OK, so I'm playing with
>> settings so I tried to figure out what I did to make it increase so
>> much. I finally ran my old original LTIB in an old virtual machine to
>> compare. Without making any changes to the old environment, the jffs2
>> file size also increased from about 14mB to 25mB. So it seems that the
>> thing that changed was maybe data downloaded from the GPP, (maybe.)
>>
>> So now I have a copy of my old 14mB jffs2 file and the new 25mB jffs2
>> file. The question is: How can I compare these to files to see what the
>> difference is? I can't boot the new 25mB file because I only have a
>> 16mB flash. Can I somehow mount a jffs2 file in Ubuntu even though it's
>> a file and not in a flash. Is there some other way I can look into the
>> jffs2 files? Does anybody know why my file size doubled without
>> changing any settings?
>>
>> My original LTIB version is: 6.4.1
>> My current LTIB version is: ltib 10.1.1 ($Revision: 1.62 $)
>> Target: MPC5200
>>
>> Thanks!
>