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A problem when install pci driver on Redhat enterprise linux AS 4 platform

Hi all,
I compiled a pci device driver provided by ti in  /pspdrivers_1_10_01 folder on Redhat enterprise linux AS 4 platform and installed it using "insmod" successfully at the first time. I changed the pci slot to plug EVM DM6437 DVDP  in after reboot the host machine, but  when I use "ismod" to install the pci driver it go faild, the information is:
    "Unable to handle kernel Null pointer dereference at Virtual address 00000120 ..."
     "Code: Bad EIP value"
     "segmentation fault".
But when I use "lsmod" command to see the list of module, the pcidriver appeared in the list.
 Then  I plug the board in the slot which the pci driver installed and run successfully at  the first time, it still goes faild. I tryed to reinstall the Redhat enterprise linux AS4, and tryed to change harddisk and mainboard, the same error still appeared."
Please give me a hand,thank you!