[U-Boot] MTD partitions not mounted by the kernel

[Alexandre Gambier <a.gambier@ftemaximal.fr>]

Hello,

I use U-Boot 1.3.1 with a NOR and a NAND Flash.
I created the following partitions with U-Boot.

device nor0 <NOR>, # parts = 4
  #: name                        size            offset          mask_flags
  0: U-Boot              0x00080000      0x00000000      0
  1: Environment         0x00020000      0x00080000      0
  2: Kernel              0x00400000      0x000a0000      0
  3: FreeNOR             0x00360000      0x004a0000      0

device nand0 <NAND>, # parts = 2
  #: name                        size            offset          mask_flags
  0: FS                  0x02000000      0x00000000      0
  1: FreeNAND            0x06000000      0x02000000      0

active partition: nor0,0 - (U-Boot) 0x00080000 @ 0x00000000

defaults:
mtdids  : nor0=NOR,nand0=NAND
mtdparts: 
mtdparts=NOR:512k(U-Boot),128k(Environment),4M(Kernel),-(FreeNOR);NAND:32M(FS),-(FreeNAND)

I checked the support for MTD devices and for the MTD command line in 
the kernel config.

here is my bootargs environment variable :
bootargs=console=ttyAS0,115200 mem=128M root=/dev/nfs 
nfsroot=192.168.1.60:/tftpboot/stlinux/skyworth/rootfs 
ip=192.168.1.111:192.168.1.60:192.168.1.1:255.255.255.0 
mtdparts=NOR:512k(U-Boot),128k(Environment),4M(Kernel),-(FreeNOR);NAND:32M(FS),-(FreeNAND)

The problem is that once my system is running the MTD devices in /dev 
are not created and the file /proc/mtd is empty.

Is my command line wrong ?

Thanks in advance.
Alex