usb device not detecting (pxa27x, linux-2.6.20)

Hi all,
    I am trying to enable usb support on PXA27x board using 
linux-2.6.20.  Inserted the following modules successfully
    usbcore.ko
    ohci_hcd.ko
    usb-storage.ko
    and inserted the flash drive(1GB) on USB port.
    but  "/sys/bus/usb/devices/" directory is empty. I found no 
information even enabling DEBUG mode.
    Initially module ohci-hcd.ko was not registering properly bcos of 
empty platform_data. So fixed the bug with the help of patch found on link
    "http://lkml.org/lkml/2006/6/8/221".
   
    here is the dmesg output while inserting the modules.

root:/tmp# insmod usbcore.ko
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
root:/tmp# lsmod
Module                  Size  Used by    Not tainted
usbcore               145956  0
root:/tmp# dmesg -c
kobject usbcore: registering. parent: <NULL>, set: module
kobject drivers: registering. parent: usbcore, set: <NULL>
kobject_uevent_env
fill_kobj_path: path = '/module/usbcore/drivers'
kobject_uevent_env
fill_kobj_path: path = '/module/usbcore'
subsystem usb: registering
kobject usb: registering. parent: <NULL>, set: bus
kobject devices: registering. parent: usb, set: <NULL>
kobject drivers: registering. parent: usb, set: <NULL>
bus type 'usb' registered
device class 'usb_host': registering
subsystem usb_host: registering
kobject usb_host: registering. parent: <NULL>, set: class
bus usb: add driver usbfs
kobject usbfs: registering. parent: <NULL>, set: drivers
kobject_uevent_env
fill_kobj_path: path = '/bus/usb/drivers/usbfs'
usbcore: registered new interface driver usbfs
device class 'usb_device': registering
subsystem usb_device: registering
kobject usb_device: registering. parent: <NULL>, set: class
bus usb: add driver hub
kobject hub: registering. parent: <NULL>, set: drivers
kobject_uevent_env
fill_kobj_path: path = '/bus/usb/drivers/hub'
usbcore: registered new interface driver hub
bus usb: add driver usb
kobject usb: registering. parent: <NULL>, set: drivers
kobject_uevent_env
fill_kobj_path: path = '/bus/usb/drivers/usb'
usbcore: registered new device driver usb

root:/tmp# insmod ohci-hcd.ko
root:/tmp# dmesg
kobject ohci_hcd: registering. parent: <NULL>, set: module
kobject drivers: registering. parent: ohci_hcd, set: <NULL>
kobject_uevent_env
fill_kobj_path: path = '/module/ohci_hcd/drivers'
kobject_uevent_env
fill_kobj_path: path = '/module/ohci_hcd'
2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver 
(pxa27x)<7>block sizes: ed 64 td 64
bus platform: add driver pxa27x-ohci
kobject pxa27x-ohci: registering. parent: <NULL>, set: drivers
kobject_uevent_env
fill_kobj_path: path = '/bus/platform/drivers/pxa27x-ohci'
root:/tmp# lsmod
Module                  Size  Used by    Not tainted
ohci_hcd               36964  0
usbcore               145956  1 ohci_hcd


root:/tmp# insmod usb-storage.ko
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
root:/tmp# dmesg
kobject usb_storage: registering. parent: <NULL>, set: module
kobject drivers: registering. parent: usb_storage, set: <NULL>
kobject_uevent_env
fill_kobj_path: path = '/module/usb_storage/drivers'
kobject_uevent_env
fill_kobj_path: path = '/module/usb_storage'
Initializing USB Mass Storage driver...
bus usb: add driver usb-storage
kobject usb-storage: registering. parent: <NULL>, set: drivers
kobject_uevent_env
fill_kobj_path: path = '/bus/usb/drivers/usb-storage'
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
root:/tmp# lsmod
Module                  Size  Used by    Not tainted
usb_storage            87339  0
ohci_hcd               36964  0
usbcore               145956  2 usb_storage,ohci_hcd

root:/tmp# ps
  PID  Uid     VmSize Stat Command
    1 0           476 S   init
    2 0               SWN [ksoftirqd/0]
    3 0               SW< [events/0]
    4 0               SW< [khelper]
    5 0               SW< [kthread]
   36 0               SW< [kblockd/0]
   37 0               SW< [kseriod]
   50 0               SW  [pdflush]
   51 0               SW  [pdflush]
   52 0               SW< [kswapd0]
   53 0               SW< [aio/0]
  665 0               SW  [mtdblockd]
  812 0           676 R   -sh
  927 0               SW< [ksuspend_usbd]
  930 0               SW< [khubd]
  953 0           532 R   ps



Thanks in advance
Girish A J

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