Symbol not found. Error while inserting usb hcd module

I am currently working on a i.MX21 ARM9 board, which has a USB host port.
After some searching I got the host HCD driver for the processor. I compiled
the driver (and also the USB subsystem) as a modules. After Linux booted
properly on the board I then did insmod on the modules one by one according 
To the dependencies as given in the modules.dep file as given below

/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/storage/libusual.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/storage/usb-storage.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/storage/libusual.ko
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/mon/usbmon.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/misc/usbtest.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/host/imx21-hcd.ko:
/lib/modules/2.6.16QCam-vc/kernel/drivers/usb/core/usbcore.ko

All the other modules load properly. However, when I do insmod on
'imx21-hcd.ko' at last then it gives the following error:

imx21_hcd: Unknown symbol platform_driver_unregister
imx21_hcd: Unknown symbol platform_driver_register
insmod: cannot insert 'imx21-hcd.ko': Unknown symbol in module (-1): No such
file or directory

Has anybody come across this problem before? 

Thanks and Regards,
Ashtekar Kaustubh





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