Re: jffs2 problem - magic bitmask not found

[Michael Palme <m.palme@goepel.com>]

hello again :-)

after lots of time playing around that thing put me really into madness...

but could be i am doing something wrong!?
please verify:

i want to use jffs2 on my strongarmboard with 32Mb Intel strata flash.
so i think things to do to get a working jffs2 partition are as follows:

* built kernel with mtd and jffs2 support (i have done this ... kernel 
2.4.18-rmk7 with patched in mtd-cvs)

* built mtd-utils (successfully done -- crossbuilt for running on arm 
native)

* create partitions on flash (i have done this via commmand line 
partition table parsing -- CONFIG_CMDLINE="root=/dev/ram0 
mtdparts=sa1100:256k(blob),256k(parm),1M(krnl),4M(rd),1M(krnl2),4M(rd2),-(jffs2)")

* erase the jffs2 partition (done via "eraseall /dev/mtd6" -- also tried 
to delete it via jtag, so im sure theres no crap in after erasing...)

* verify things ("cat /proc/mtd" and "mtd_debug info /dev/mtd6" -- okay, 
everything as expected)

* create a jffs2 image (done via "mkfs.jffs2 -r foo -o jffs2.img -p -e 
262144"  -- image contains only a dummy file and is very small)

* copy the image to the mtd partition ("cp jffs2.img /dev/mtd6")

* mounting the jffs2 partition 1st time (works okay via "mount -t jffs2 
/dev/mtdblock6 /mnt/jffs2")

* verify contents (okay "ls /mnt/jffs2" shows the dummy file)

BUT THEN:

* umount jffs2 part ("umount /mnt/jffs2") takes *very* long

* immediately remount of the jffs2 part brings lots of error messages:

jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00040000:
0x2003 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00040004:
0x000c instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00040008:
0xdc6d instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00080000:
0x2003 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00080004:
0x000c instead

* but after that, "mount" shows the jffs2 part as mounted and i can see 
the dummy file again

* now unmounting again -- now very fast!?

i've tried again and again... no success.

please who can help
i need the fs for production use...

thanks in advance ... Michael Palme