Interesting MTD (jffs2) problem - magic bitmask not found

[Michael Palme]

hello...


i've posted this on linux-arm mailing list, but i think its also 
interesting for this list...

i run 2.4.18-rmk7 with mtd from cvs (mid september).
problem as follows:
# cat /proc/mtd
   dev:    size   erasesize  name
   mtd0: 00040000 00040000 "blob"
   mtd1: 00040000 00040000 "parm"
   mtd2: 00100000 00040000 "krnl"
   mtd3: 00400000 00040000 "rd"
   mtd4: 00100000 00040000 "krnl2"
   mtd5: 00400000 00040000 "rd2"
   mtd6: 01580000 00040000 "jffs2"
# mtd_debug info /dev/mtd6
   mtd.type = MTD_NORFLASH
   mtd.flags = MTD_CAP_NORFLASH
   mtd.size = 22544384 (21M)
   mtd.erasesize = 262144 (256K)
   mtd.oobblock = 0
   mtd.oobsize = 0
   mtd.ecctype = MTD_ECC_NONE
   regions = 0
# cd /root
# ls temp
   temp1  temp2
# mkfs.jffs2 -r temp -e 262144 -o jffs2img
# eraseall /dev/mtd6
   Erasing 256 Kibyte @ ...[snip]...  100% complete.
# cp jffs2img /dev/mtd6
# mount /dev/mtdblock6 -t jffs2 /mnt/jffs2/
# cd /mnt/jffs2
# ls
   temp1  temp2
# rm -r temp*
... [this tooks very long time] ...
# ls
# cd /
# umount /mnt/jffs2/
# mount /dev/mtdblock6 -t jffs2 /mnt/jffs2/
?????????????????????????????????????????????????????????????????????
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
...[snip]...
?????????????????????????????????????????????????????????????????????
# mount
   /dev/ramdisk on / type ext2 (rw)
   none on /proc type proc (rw)
   /dev/mtdblock6 on /mnt/jffs2 type jffs2 (rw)
# cd /mnt/jffs2/
# ls
#
...

best regards... Michael Palme