Cannot write to ubi volume

[iw3gtf at tiscali.it]

Hallo,

according to the ubi documentation it should be possible to 'write' in 
a, say, /dev/ubi1_0 (dynamic) volume device.
I tried the following without success:

root at giorgio [ ~ ]# ubimkvol /dev/ubi1 -N "rootfs" -s 32MiB 
Volume ID 0, size 265 LEBs (33648640 bytes, 32.1 MiB), LEB size 126976 
bytes (124.0 KiB), dynamic, name "rootfs", alignment 1
root at giorgio [ ~ ]# ls -al /dev/ubi*
crw-rw---- 1 root root 254,  0 1970-01-01 01:00 /dev/ubi0
crw-rw---- 1 root root 254,  2 1970-01-01 01:00 /dev/ubi0_1
crw-rw---- 1 root root 253,  0 1970-01-01 01:00 /dev/ubi1
crw-rw---- 1 root root 253,  1 2008-06-04 17:03 /dev/ubi1_0
crw-rw---- 1 root root  10, 63 1970-01-01 01:00 /dev/ubi_ctrl
root at giorgio [ ~ ]# dd if=/usr/local/tftp_root/k of=/dev/ubi1_0 
count=1960020 bs=1
dd: writing `/dev/ubi1_0': Operation not permitted
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00690123 s, 0.0 kB/s
root at giorgio [ ~ ]# ubinfo /dev/ubi1_0
Volume ID:   0 (on ubi1)
Type:        dynamic
Alignment:   1
Size:        265 LEBs (33648640 bytes, 32.1 MiB)
State:       OK
Name:        rootfs
Character device major/minor: 253:1

Am I completely wrong trying to write with a 'dd' ?
How should I proceed to write something into the volume ?
Is it possible to write something 'directly' in an ubi volume without 
explicitly formatting an image file (with 'ubinize' for example) ?

Excuse me if my questions are a bit silly or naive and thank you for 
your explanations.

giorgio



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