[Ubi] Wrong major:minor

[Gilles]

Hello

I used the following data to compile Ubi(fs) into a uClinux kernel:

========= device_table.txt
#UBIFS nodes
/dev/ubi_ctrl	c	644	0	0	10	63	0	0	-
/dev/ubi0	c	644	0	0	253	0	0	0	-
========= 

However, ubimkvol isn't happy with it:
========= 
root:~> ubimkvol /dev/ubi0 -s 20MiB -N ubifs0

libubi: error!: "/dev/ubi0" has major:minor 253:0, but this does not
correspond to any UBI device or volume

ubimkvol: error!: "/dev/ubi0" is not an UBI device node
========= 

Here's what the two device nodes look like in the running kernel:
========= 
root:~> ls -al /dev/ubi*
crw-r--r--    1 root     root      253,   0 May 27  2011 /dev/ubi0
crw-r--r--    1 root     root       10,  63 May 27  2011 /dev/ubi_ctrl
========= 

I'm no Linux expert, and was wondering how to find out what the
correct major:minor is for the Ubi device nodes? Are they defined
somewhere in the Linux source code?

Thank you.