Mount-failure (jffs2_scan_empty()) mounting SmartMedia with jffs2

Mount-failure (jffs2_scan_empty()) mounting SmartMedia with jffs2

[Martin Egholm Nielsen]

Hi there,

I'm attempting to mount a jffs2-filesystem on a SmartMedia card but it's 
not quite successfull (read: it doesn't work at all).
Some info:

* On startup the kernel informs me of the following:
SmartMedia card inserted.
NAND device: Manufacture ID: 0xec, Chip ID: 0x75 (Samsung KM29U256T)

* The /proc/mtd contains the following:
dev:    size   erasesize  name
mtd0: 00200000 00010000 "Physically mapped flash"
mtd1: 00840000 00000420 "Atmel AT45DB642"
mtd2: 02000000 00004000 "Samsung KM29U256T"

i.e. the flash-device I'm trying to use is "mtd2".

* Running "eraseall /dev/mtd/2" works like a charm.

* I try to create a small filesystem with the command:
  mkfs.jffs2 --eraseblock=0x4000 --pad --root=/usr/adm --output=/tmp/image

* I copied the filesystem to the device: "cp /tmp/image /dev/mtd/2"

* ...and tried to mount it: "mount -t jffs2 /dev/mtdblock/2 /mnt/mtd"
but this is where the sky falls down - I get tons of messages like the 
following:
jffs2_scan_empty(): Empty block at 0x0000001c ends at 0x00000200 (with 
0x0000000
0)! Marking dirty
<%%%% SNIP %%%%>
Further such events for this erase block will not be printed
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased

And now I'm lost... Any ideas of how to get any further?

Regards,
  Martin Egholm Nielsen

Re: Mount-failure (jffs2_scan_empty()) mounting SmartMedia with jffs2

[David Woodhouse]

On Tue, 2003-10-21 at 11:20 +0200, Martin Egholm Nielsen wrote:
> And now I'm lost... Any ideas of how to get any further?

Can you read back the contents of the flash after writing, and compare
with the image you attempted to write?

-- 
dwmw2

Re: Mount-failure (jffs2_scan_empty()) mounting SmartMedia with jffs2

[Martin Egholm Nielsen]

>>And now I'm lost... Any ideas of how to get any further?
> Can you read back the contents of the flash after writing, and compare
> with the image you attempted to write?
Heh, good point! I tried the following:

# dd if=/tmp/image of=/dev/mtd/2
32+0 records in
32+0 records out

# dd if=/dev/mtd/2 of=/tmp/copy count=32 bs=512
32+0 records in
32+0 records out

# ls -l /tmp
-rw-r--r--    1 root     root       16384 Jan  1 00:00 image
-rw-r--r--    1 root     root       16384 Jan  1 00:01 copy

# diff /tmp/image /tmp/copy
Binary files /tmp/image and /tmp/copy differ

I.e. not the same, no... You know why?

Regards,
  Martin Egholm Nielsen