Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Hi All.
I am working on SAM9260 board. I would like to boot the board with my kernel image (uImage) and mount the rootfs available in the NAND which is jffs2 image. I tried with the default configuration available in 'arch/arm/configs/at91sam9260ek_defconfig' and downloaded the uImage via tftp and gave bootm, the kernel is crashing. Following is the error I am getting:

U-Boot> tftp 0x21800000 uImage
macb0: link up, 100Mbps full-duplex (lpa: 0x41e1)
Using macb0 device
TFTP from server 192.168.2.102; our IP address is 192.168.2.6
Filename 'uImage'.
Load address: 0x21800000
Loading: #################################################################
   #################################################################
   #################################################################
   #################################################################
   ##############################################################
done
Bytes transferred = 1645224 (191aa8 hex)
U-Boot> bootm
## Booting kernel from Legacy Image at 21800000 ...
   Image Name: Linux-2.6.30
   Image Type: ARM Linux Kernel Image (uncompressed)
   Data Size: 1645160 Bytes = 1.6 MB
   Load Address: 20008000
   Entry Point: 20008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.30 (jagan@jagan-desktop) (gcc version 4.2.3) #3 Thu Jul 28 17:18:05 IST 2011
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Atmel AT91SAM9260-EK
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 198 MHz, master 99 MHz, main 18.432 MHz
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128
Kernel command line: console=ttyS0,115200 root=/dev/mtdblock2 rw rootfstype=jffs2 mtdparts=at91_nand:1M(bootloader),3M(kernel),-(rootfs)
NR_IRQS:192
AT91: 96 gpio irqs in 3 banks
PID hash table entries: 128 (order: 7, 512 bytes)
Console: colour dummy device 80x30
console [ttyS0] enabled
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 29164KB available (2928K code, 234K data, 108K init, 0K highmem)
Calibrating delay loop... 99.12 BogoMIPS (lpj=495616)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
net_namespace: 296 bytes
NET: Registered protocol family 16
AT91: Power Management
AT91: Starting after general reset
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
cfg80211: Calling CRDA to update world regulatory domain
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
NET: Registered protocol family 1
NetWinder Floating Point Emulator V0.97 (double precision)
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
JFFS2 version 2.2. (NAND) (SUMMARY) �© 2001-2006 Red Hat, Inc.
msgmni has been set to 56
alg: No test for stdrng (krng)
io scheduler noop registered
io scheduler anticipatory registered (default)
atmel_usart.0: ttyS0 at MMIO 0xfefff200 (irq = 1) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xfffb0000 (irq = 6) is a ATMEL_SERIAL
atmel_usart.2: ttyS2 at MMIO 0xfffb4000 (irq = 7) is a ATMEL_SERIAL
brd: module loaded
loop: module loaded
nbd: registered device at major 43
ssc ssc.0: Atmel SSC device at 0xc2870000 (irq 14)
Driver 'sd' needs updating - please use bus_type methods
MACB_mii_bus: probed
eth0: Atmel MACB at 0xfffc4000 irq 21 (00:0e:20:02:0a:5b)
eth0: attached PHY driver [Davicom DM9161A] (mii_bus:phy_addr=ffffffff:00, irq=-1)
NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit)
Scanning device for bad blocks
Bad eraseblock 1451 at 0x00000b560000
Creating 2 MTD partitions on "atmel_nand":
0x000000000000-0x000000040000 : "Partition 1"
0x000000040000-0x000010000000 : "Partition 2"
atmel_spi atmel_spi.1: Atmel SPI Controller at 0xfffcc000 (irq 13)
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
at91_ohci at91_ohci: irq 20, io mem 0x00500000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
udc: at91_udc version 3 May 2006
mice: PS/2 mouse device common for all mice
input: gpio-keys as /class/input/input0
rtc-at91sam9 at91_rtt.0: rtc core: registered at91_rtt as rtc0
IRQ 1/rtc0: IRQF_DISABLED is not guaranteed on shared IRQs
rtc-at91sam9 at91_rtt.0: rtc0: SET TIME!
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
Registered led device: ds5
Registered led device: ds1
Advanced Linux Sound Architecture Driver Version 1.0.20.
at73c213 spi1.0: at73c213: supported bitrate is 48500 (64 divider)
ALSA device list:
  #0: AT91SAM9260-EK external DAC on irq 14
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
lib80211: common routines for IEEE802.11 drivers
rtc-at91sam9 at91_rtt.0: hctosys: unable to read the hardware clock
List of all partitions:
1f00 256 mtdblock0 (driver?)
1f01 261888 mtdblock1 (driver?)
No filesystem could mount root, tried: jffs2
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Can any one tell me the reason for the above crash?

What is the configuration file I should use.

Thanks in advance.

Regards,
Jagan