Fatal trap 18

i have an IBM Thinkpad A30 which comes with embedded wireless. the mini-pci card is Prism card. the following is information from the post or loader when i boot FreeBSD 5.2.1

wi0: <Intersil Prism2.5> mem 0xf0000000 – 0xf0000fff irq11 at device 2.0 on pci2
wi0: 802.11 address: 00:20:c0:8a:93:ce
wi0: using RF: PRISM2.5 MAC: ISL3874A(Mini-PCI)
wi0: Intersil Firmware: Primary (1.1.0), Station(1.4.2)
wi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps

when i type in this
ifconfig wi0
i get the following info

wi0: flags = 8843 <UP, BROADCAST, RUNNING, SIMPLEX, MULTICAST> mtu 1500
inet6 fe80::220:e0ff:fe8a:93cd% wi0 prefixlen 64 scopeid 0x1
inet netmask 0xff0880 broadcast
ether 00:20:e0:9a:93:ce
media: IEEE 802.11 Wireless Ethernet Autoselect (DS/2Mbps)
status: no carrier
ssid “”
stationname “FreeBSD Wavelan /IEEE node”
Channel -1 authmode OPEN powersavemode OFF powersaveleep 100
wepmode OFF weptxkey1

i then type in the following command

ifconfig wi0 inet netmask ssid my_ssid

immediately after this command is done, i get the following error

Fatal trap 18: integer divide fault while in kernel mode
cupid = 0; apicid = 00
instruction pointer = 0x8: 0xc0583642
stack pointer = 0x10: 0xcdcafcc8
fram pointer = 0x10: 0xcdcafcc8
code segment = base 0x0, limit oxfffff, type ox1b
= DPL 0, pres 1, det32 1, gram1
processor eflags = interrupt enabled, IOPL = 0
current process = 22 (irq11: cbb0 cbb1+++)
trap number = 18
panic : integer divide fault
cupid =0;

can someone help me out here? this happens no matter how many commands are tide on to ifconfg, what i mean is that i get the same error when i type in the following commands:

ifconfig wi0 inet OR
ifconfig wi0 netmask OR
ifconfig wi0 ssid my_ssid OR
any other combination.

thank you

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