JFFS2 on 8MB Flash-Chip conneted to MPC850 works extremly slow:(

[Wojciech Kromer]

Jonas Holmberg wrote:

> > Does the size of the output from mkcramfs exceed the size of
> > the partition
> > the kernel thinks it's in?
>
> No, mkcramfs says: "Everything: 984 kilobytes"
>
> And the image created is 1007616 bytes (984 * 1024).
>

OK. Now I have cramfs on one chip and some partitions on second chip.

But writing my user partition (/dev/mtdblock4) destroys data from the
begining of my chip !
What's wrong?

Some logs:

>From kernel booting:
..................................................................................................................................................

JFFS2 version 2.1. (C) 2001 Red Hat, Inc., designed by Axis
Communications AB.
ATMA Flash 0x800000 at 0x41000000
Filesystem flash: Found 1 x16 devices at 0x0 in 16-bit mode
 Amd/Fujitsu Extended Query Table v1.1 at 0x0040
number of CFI chips: 1
ATMA Flash 0x200000 at 0x40000000
Boot flash: Found 1 x16 devices at 0x0 in 16-bit mode
 Amd/Fujitsu Extended Query Table v1.0 at 0x0040
number of CFI chips: 1
0: offset=0x0,size=0x4000,blocks=1
1: offset=0x4000,size=0x2000,blocks=2
2: offset=0x8000,size=0x8000,blocks=1
3: offset=0x10000,size=0x10000,blocks=31
Creating 4 MTD partitions on "Boot flash":
0x00000000-0x00020000 : "ppcboot"
0x00020000-0x00030000 : "config"
0x00030000-0x00100000 : "kernel"
0x00100000-0x00200000 : "user"


In system:
............................................................................................................................................................

# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00800000 00010000 "Filesystem flash"
mtd1: 00020000 00010000 "ppcboot"
mtd2: 00010000 00010000 "config"
mtd3: 000d0000 00010000 "kernel"
mtd4: 00100000 00010000 "user"
# ls -l /dev/mtd*
crw-rw-rw-    1 517      517       90,   0 Sep  5 08:30 /dev/mtd0
crw-r--r--    1 root     root      90,   2 Sep  6 10:02 /dev/mtd1
crw-r--r--    1 root     root      90,   4 Sep  6 11:11 /dev/mtd2
crw-r--r--    1 root     root      90,   6 Sep  6 11:11 /dev/mtd3
crw-r--r--    1 root     root      90,   8 Sep  6 11:11 /dev/mtd4
brw-rw-rw-    1 517      517       31,   0 Sep  5 08:30 /dev/mtdblock0
crw-r--r--    1 root     root      31,   1 Sep  6 09:36 /dev/mtdblock1
brw-r--r--    1 root     root      31,   2 Sep  6 11:12 /dev/mtdblock2
brw-r--r--    1 root     root      31,   3 Sep  6 11:12 /dev/mtdblock3
brw-r--r--    1 root     root      31,   4 Sep  6 11:12 /dev/mtdblock4
crw-rw-rw-    1 517      517       90,   1 Sep  5 08:30 /dev/mtdr0
crw-r--r--    1 root     root      90,   3 Sep  6 10:02 /dev/mtdr1
#


Mounting:

# mount /dev/mtdblock4 /jffs2/
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000:
0x2705 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004:
0x7070 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008:
0x6f6f instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000000c:
0x302e instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000010:
0x3320 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000014:
0x7567 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000018:
0x3920 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000001c:
0x3031 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000020:
0x2030 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000024:
0x3333 instead
Further such events for this erase block will not be printed
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased
...

???????????????????  ^^^^^^^^^^^ WHY
??????????????????????????????????????????????
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