Hi All,
    Currently i am using  linux-omap-psp-2.6.32-r102g version of kernel for overo board.

My boot args information is
Kernel command line: console=ttyS2,115200n8 vram=12M omapfb.mode=dvi:640x480-16@60 omapfb.debug=y omapdss.def_disp=lcd43 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwai
t consoleblank=0 mem=80M i2c_bus=3,100 video=omapfb:vram:2M,vram:4M

When i enable CONFIG_FB_OMAP2_NUM_FBS=2, i got following crash

Unable to handle kernel NULL pointer dereference at virtual address 00000187
pgd = c0004000
[00000187] *pgd=00000000
Internal error: Oops: 5 [#1]
last sysfs file:
Modules linked in:
CPU: 0    Not tainted  (2.6.32 #7)
PC is at omap_vout_probe+0x85c/0x9b0
LR is at omap_vout_probe+0x81c/0x9b0
pc : [<c0024b70>]    lr : [<c0024b30>]    psr: 80000013
sp : c4819ed0  ip : c4a3630c  fp : 00000000
r10: c05a6bb8  r9 : c4a36300  r8 : c05a6bb0
r7 : 00000000  r6 : c4a10000  r5 : c4a10000  r4 : 00000003
r3 : c4a3630c  r2 : c4a36304  r1 : c05dd690  r0 : 00000003
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c5387d  Table: 80004019  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc48182f0)
Stack: (0xc4819ed0 to 0xc481a000)
9ec0:                                     c4a10208 c01181ac c4a3631c c4a36300
9ee0: c4a3d200 c4a3d200 00000003 c4a36304 00000001 c4a3630c 00000001 00000004
9f00: c4858ab8 c05a6bb8 c05a6bb8 c05cc628 c05cc628 c05c6090 c0246d9c 00000000
9f20: 00000000 c0248e48 c05cc628 c0247d9c c05cc628 c05a6bb8 c05a6bec c05cc628
9f40: c4819f58 c0247ecc 00000000 c0247e6c c05cc628 c02475a8 c48039f8 c4857d70
9f60: c05c6090 c48001c0 00000080 c05cc628 c4a85cc0 c0246e80 c04eed6d 4e2d6850
9f80: c002cf54 c002cf60 c05cc628 00000000 00000000 00000000 00000000 c02481d0
9fa0: c002cf54 c002cf60 c00242e0 00000000 00000000 c00242f0 c002394c c003234c
9fc0: 00000000 00000192 c05aa8e4 00000000 00000000 c002cf54 c002cf60 00000000
9fe0: 00000000 c0008404 00000000 00000000 00000000 c0033900 50f7ff00 447bf424
[<c0024b70>] (omap_vout_probe+0x85c/0x9b0) from [<c0248e48>] (platform_drv_probe+0x1c/0x24)
[<c0248e48>] (platform_drv_probe+0x1c/0x24) from [<c0247d9c>] (driver_probe_device+0xa4/0x174)
[<c0247d9c>] (driver_probe_device+0xa4/0x174) from [<c0247ecc>] (__driver_attach+0x60/0x84)
[<c0247ecc>] (__driver_attach+0x60/0x84) from [<c02475a8>] (bus_for_each_dev+0x4c/0x8c)
[<c02475a8>] (bus_for_each_dev+0x4c/0x8c) from [<c0246e80>] (bus_add_driver+0x104/0x290)
[<c0246e80>] (bus_add_driver+0x104/0x290) from [<c02481d0>] (driver_register+0xbc/0x148)
[<c02481d0>] (driver_register+0xbc/0x148) from [<c00242f0>] (omap_vout_init+0x10/0x34)
[<c00242f0>] (omap_vout_init+0x10/0x34) from [<c003234c>] (do_one_initcall+0x5c/0x1bc)
[<c003234c>] (do_one_initcall+0x5c/0x1bc) from [<c0008404>] (kernel_init+0x94/0x110)
[<c0008404>] (kernel_init+0x94/0x110) from [<c0033900>] (kernel_thread_exit+0x0/0x8)
Code: e1a04007 ea00000e e59d3024 e5930060 (e590c184)
---[ end trace b2d8e0edcfd5153d ]---
Kernel panic - not syncing: Attempted to kill init!

How to over come this exception?

Thanks and regards,