[Buildroot] Buildroot creates broken jffs2 image

Bjørn Forsman bjorn.forsman at gmail.com
Wed Nov 10 17:29:25 UTC 2010

On 9 November 2010 18:43, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Hello,
> On Tue, 9 Nov 2010 16:25:23 +0100
> Bjørn Forsman <bjorn.forsman at gmail.com> wrote:
>> 3) look at the build log and retrieve the mkfs.jffs2 command that
>> buildroot used:
>> echo
>> "     /home/bjornfor/forks/buildroot-skipper/output/host/usr/sbin/mkfs.jffs2
>> -e 0x20000 -p -l -s 0x800 -n
>> -d /home/bjornfor/forks/buildroot-skipper/output/target
>> -o /home/bjornfor/forks/buildroot-skipper/output/images/rootfs.jffs2"
>> >> /home/bjornfor/forks/buildroot-skipper/output/build/_fakeroot.fs
>> 4) issue the command with *host* mkfs.jffs2 instead (using the exact
>> same arguments):
>> mkfs.jffs2 -e 0x20000 -p -l -s 0x800 -n -d
>> /home/bjornfor/forks/buildroot-skipper/output/target -o
>> /home/bjornfor/forks/buildroot-skipper/output/images/rootfs.jffs2.v2
>> 5) flash new jffs2 image and mount. This time with *no errors*.
>> Any ideas on why this is happening?
> Not sure, but steps 3) and steps 4) are not identical. In step 3),
> mkfs.jffs2 is called by fakeroot, which first creates the device files.
> In step 4), you don't have anything creating the device files.


> Could you try doing step 4 (i.e calling mkfs.jffs2 directly), but by
> calling the mkfs.jffs2 built by Buildroot (in $(HOST_DIR)) ?

Yes. What I found is that calling HOST_DIR mkfs.jffs2 directly (and
not in fakeroot) also created a bad image.

However, I just looked at the BR changelog and found this:

$ git log HEAD..origin/master -- package/mtd/
commit 90660c282298fdb6b09baefe44845b923d9e077f
Author: Peter Korsgaard <jacmet at sunsite.dk>
Date:   Sat Oct 16 22:20:21 2010 +0200

    mtd: bump version

    For mkfs.jffs2 bugfix.

    Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>

commit 823aaef1ce9d68e14ff9ac26f38b74139a77f47b
Author: Peter Korsgaard <jacmet at sunsite.dk>
Date:   Fri Oct 15 10:39:23 2010 +0200

    mtd: fix big endian crc calculation

    Taken from upstream git.

    Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>

So I cherry-picked these commits and rebuilt. Now the issue is gone!
Sweet! But AFAICS, jffs2 is broken for 2010.08 users...

Thanks for your help, Thomas.

Best regards,
Bjørn Forsman

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