[oe-issues] [Bug 1680] New: Can't use JFFS2 root image - older jffs2 fs with newer kernel?

[bugzilla-daemon at tinman.treke.net]

http://bugs.openembedded.org/show_bug.cgi?id=1680

           Summary: Can't use JFFS2 root image - older jffs2 fs with newer
                    kernel?
           Product: Openembedded
           Version: Angstrom
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: Distributions
        AssignedTo: openembedded-issues at lists.openembedded.org
        ReportedBy: andrea.adami at gmail.com
         QAContact: tinderbox-oe at gmx.net


I'm trying to boot a self-built angstrom image.

The kernel boots fine, makes it to the 
point where it would normally mount root.

Then stucks and starts scrolling with the message:

jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000000x: 0x00xx
instead
...
...


A quick search on Google reveals something similar:

http://groups.google.com/groups?lnk=hpsg&q=jffs2_scan_eraseblock%28%29%3A+Magic+bitmask+0x1985+not+found

I cannot read the first lines but here are some full logs (from ancient posts):

# mount -t jffs2 /dev/mtdblock/2 /mnt 
Old JFFS2 bitmask found at 0x00000000 
You cannot use older JFFS2 filesystems with newer kernels 
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004: 0x0040
instead 
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008: 0x0001
instead
...
...
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000044: 0x000b
instead 
Further such events for this erase block will not be printed 
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased


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