iwi0 firmware error on Dell Inspiron 6000 w/ Intel PRO/Wireless 2200BG

I just upgraded a laptop to FreeBSD RELENG_7 checked out on 20071016.  
Previously, iwi0 had worked OK under FreeBSD 6.2.  After updating to 7, 
though, iwi0 reports "firmware error" and nothing more happens.  I have 
set legal.intel_iwi.license_ack=1 in /boot/loader.conf.  wpa_supplicant 
and dhclient are running with the same configurations that worked under 
FreeBSD 6.  I'm using the GENERIC kernel with SCHED_ULE instead of 
SCHED_4BSD, and the loaded modules are:

Id Refs Address    Size     Name
 1   23 0xc0400000 8d0750   kernel
 2    1 0xc0cd1000 111b8    geom_eli.ko
 3    2 0xc0ce3000 25ff8    crypto.ko
 4    2 0xc0d09000 ab40     zlib.ko
 5    1 0xc0d14000 6e48     snd_ich.ko
 6    2 0xc0d1b000 4a52c    sound.ko
 7    1 0xc0d66000 69164    acpi.ko
10    1 0xc32fb000 22000    linux.ko
11    1 0xc3595000 21000    radeon.ko
12    1 0xc35b6000 f000     drm.ko
13    1 0xc31ff000 f000     if_iwi.ko
14    1 0xc3e4f000 30000    iwi_bss.ko

ifconfig iwi0 reports:

iwi0: flags=8803<UP,BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:12:f0:12:1c:24
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
        media: IEEE 802.11 Wireless Ethernet autoselect
        status: no carrier
        ssid "" channel 8 (2447 Mhz 11g)
        authmode WPA1+WPA2/802.11i privacy ON deftxkey 1 txpowmax 100
        bmiss 10 scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250
        roam:rssi11g 14 roam:rate11g 5 protmode CTS roaming MANUAL bintval 100

I've tried setting debug.iwi=1, and the kernel messages regarding iwi0 are:

Oct 25 08:09:11 aquarius kernel: iwi0: <Intel(R) PRO/Wireless 2200BG> mem 0xdfcfd000-0xdfcfdfff irq 17 at device 3.0 on pci3
Oct 25 08:09:11 aquarius kernel: iwi0: Ethernet address: 00:12:f0:12:1c:24
Oct 25 08:09:11 aquarius kernel: iwi0: [ITHREAD]
Oct 25 08:09:14 aquarius kernel: iwi0: firmware error
Oct 25 08:10:17 aquarius kernel: iwi_newstate: SCAN -> INIT flags 0x0
Oct 25 08:10:31 aquarius kernel: iwi_newstate: INIT -> INIT flags 0x0
Oct 25 08:10:31 aquarius kernel: iwi_newstate: INIT -> SCAN flags 0x1
Oct 25 08:10:57 aquarius kernel: iwi_newstate: SCAN -> SCAN flags 0x1
Oct 25 08:10:57 aquarius kernel: iwi_newstate: SCAN -> SCAN flags 0x1

Any ideas?

Guy

-- 
Guy Helmer, Ph.D.
Chief System Architect
Palisade Systems, Inc.