Crash after install iwn driver

I installed freeBSD 7.2 and the driver iwn. However, system crash during boot. Can anyone help me about this?

It is said that freeBSD 8.0 support iwn. Where can I download the image of freeBSD 8.0?

Code:
iwn0: iwn_read_eeprom_ht40: no entry for channel 1
iwn0: iwn_read_eeprom_ht40: no entry for channel 2
iwn0: iwn_read_eeprom_ht40: no entry for channel 3
iwn0: iwn_read_eeprom_ht40: no entry for channel 4
iwn0: iwn_read_eeprom_ht40: no entry for channel 5
iwn0: iwn_read_eeprom_ht40: no entry for channel 6
iwn0: iwn_read_eeprom_ht40: no entry for channel 7
iwn0: iwn_read_eeprom_ht40: no entry for channel 8
iwn0: iwn_read_eeprom_ht40: no entry for channel 9
iwn0: iwn_read_eeprom_ht40: no entry for channel 10
iwn0: iwn_read_eeprom_ht40: no entry for channel 11
iwn0: iwn_read_eeprom_ht40: no entry for channel 12
iwn0: iwn_read_eeprom_ht40: no entry for channel 13

Fatal trap 12: page fault while in kernel mode
cpuid=0; apic id = 00
fault virtual address = 0xc5681004
fault code = supervisor read, page not present
code segment = base 0x0, limit 0xfffff, type 0x1b
             = DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL =0
current process = 0 (swapper)
trap number = 12
panic: page fault
cpuid = 0
 
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