Trying to install Intel PRO/Wireless 2200BG support to sandpoint DSM-G600... (NetBSD 6.0 beta)

[Charles Brown <obigiankenobi%gmail.com@localhost>]

Hi,
I'm trying to substitute the default wifi card in my DSM-G600
sandpoint NAS (running NetBSD 6.0 beta) with the Intel PRO/Wireless
2200BG (iwi driver).
To reach this goal, I rebuilded the kernel adding:

iwi*    at pci? dev ? function ?        # Intel 2200bg

Booting the new kernel,
this is the dmesg output for iwi0:

iwi0 at pci0 dev 13 function 0: vendor 0x8086 product 0x4220 (rev. 0x05)
iwi0: interrupting at irq 16
iwi0: 802.11 address 00:13:ce:b2:da:12
iwi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwi0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps
24Mbps 36Mbps 48Mbps 54Mbps

and this is ifconfig:

dsm-g600# ifconfig iwi0
iwi0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
        ssid ""
        powersave off
        address: 00:13:ce:b2:da:12
        media: IEEE802.11 autoselect
        status: no network

... and iwictl:

dsm-g600# iwictl -i iwi0 -r
Radio is ON

Accepted eula with:
sysctl -w  hw.iwi.accept_eula=1

Everything ok??? No

if I try

dsm-g600# iwictl -i iwi0 -r
Radio is ON

Accepted eula with:
sysctl -w  hw.iwi.accept_eula=1

Everything ok??? No

if I try to configure the card using ifconfig or wpa_supplicant, this
is the result:

dsm-g600# ifconfig iwi0 192.168.10.10 up to configure the card using
ifconfig or wpa_supplicant, this is the result:

dsm-g600# ifconfig iwi0 192.168.10.10 up
iwi0: image 'ipw2200-bss.fw' too small
iwi0: could not cache the firmware
iwi0: cannot assign link-locetBSD 6.0 beta) with the Intel
PRO/Wireless 2200BG (iwi driver).
To reach this goal, I rebuilded the kernel adding:
al address
iwi0: image 'ipw2200-bss.fw' too small
iwi0: could not cache the firmware
iwi0: image 'ipw2200-bss.fw' too small
iwi0: could not cache the firmware
ifconfig: SIOCAIFADDR: Input/output error

The firmware files are the standard ones located in /libdata/firmware/if_iwi.
Any idea?
Thank you and bye!