Some documentation for new driver iwl3945 for chipset wifi (as given by lspcidrake -v)
unknown : Intel Corporation|PRO/Wireless 3945ABG Network Connection [NETWORK_OTHER] (vendor:8086 device:4222 subv:103c subd:135c)
using kernel Linux benLapix.eagle-usb.org 2.6.22-3mdv #1 SMP Tue Jul 31 16:25:36 CEST 2007 x86_64 Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz GNU/Linux

some links about iwl3945


some tests for iwl3945 - status: scan works

ifconfig wlan0_rename up
iwlist wlan0_rename scan
Warning: Driver for device wlan0_rename has been compiled with version 22
of Wireless Extension, while this program supports up to version 20.
Some things may be broken...

wlan0_rename  Scan completed :
	      Cell 01 - Address: 00:16:38:EE:67:4F
	                ESSID:"ALISEA-SF-EE6744"
	                Mode:Master
	                Channel:6
	                Frequency:2.437 GHz
	                Quality=49/100  Signal level=-79 dBm  Noise level=-127 dBm
	                Encryption key:on
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
	                          24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
	                          12 Mb/s; 48 Mb/s
	                Extra:tsf=00000097b6f630f6
	      Cell 02 - Address: 00:12:17:B3:55:B5
	                ESSID:"wifibaud"
	                Mode:Master
	                Channel:9
	                Frequency:2.452 GHz
	                Quality=82/100  Signal level=-52 dBm  Noise level=-127 dBm
	                Encryption key:on
	                IE: WPA Version 1
	                    Group Cipher : TKIP 
	                    Pairwise Ciphers (1) : TKIP 
	                    Authentication Suites (1) : PSK  
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
	                          24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
	                          12 Mb/s; 48 Mb/s
	                Extra:tsf=000007b4bae745d8
	      Cell 03 - Address: A2:D1:43:A6:1A:C0
	                ESSID:""
	                Mode:Master
	                Channel:12
	                Frequency:2.467 GHz
	                Quality=37/100  Signal level=-87 dBm  Noise level=-127 dBm
	                Encryption key:on
	                IE: IEEE 802.11i/WPA2 Version 1
	                    Group Cipher : CCMP 
	                    Pairwise Ciphers (1) : CCMP 
	                    Authentication Suites (1) : PSK  
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
	                          9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
	                          48 Mb/s; 54 Mb/s
	                Extra:tsf=00000032f35ceba9
	      Cell 04 - Address: A2:D1:43:A6:1A:C1
	                ESSID:""
	                Mode:Master
	                Channel:12
	                Frequency:2.467 GHz
	                Quality=31/100  Signal level=-90 dBm  Noise level=-127 dBm
	                Encryption key:on
	                IE: IEEE 802.11i/WPA2 Version 1
	                    Group Cipher : CCMP 
	                    Pairwise Ciphers (1) : CCMP 
	                    Authentication Suites (1) : PSK  
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
	                          9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
	                          48 Mb/s; 54 Mb/s
	                Extra:tsf=00000032f35cef6a
	      Cell 05 - Address: A2:D1:43:A6:1A:C3
	                ESSID:"freephonie"
	                Mode:Master
	                Channel:12
	                Frequency:2.467 GHz
	                Quality=31/100  Signal level=-90 dBm  Noise level=-127 dBm
	                Encryption key:on
	                IE: WPA Version 1
	                    Group Cipher : TKIP 
	                    Pairwise Ciphers (1) : TKIP 
	                    Authentication Suites (1) : 802.1X  
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
	                          9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
	                          48 Mb/s; 54 Mb/s
	                Extra:tsf=00000032f35cf913
	      Cell 06 - Address: A2:D1:43:A6:1A:C2
	                ESSID:""
	                Mode:Master
	                Channel:12
	                Frequency:2.467 GHz
	                Quality=33/100  Signal level=-89 dBm  Noise level=-127 dBm
	                Encryption key:on
	                IE: IEEE 802.11i/WPA2 Version 1
	                    Group Cipher : CCMP 
	                    Pairwise Ciphers (1) : CCMP 
	                    Authentication Suites (1) : PSK  
	                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
	                          9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
	                          48 Mb/s; 54 Mb/s
	                Extra:tsf=00000032f35cf470

Relevant result of ifconfig -a : (I removed eth0 and lo interfaces)
eth2      Link encap:UNSPEC  HWaddr 00-18-DE-33-C9-22-00-00-00-00-00-00-00-00-00-00  
	      BROADCAST MULTICAST  MTU:1500  Metric:1
	      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
	      TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
	      collisions:0 lg file transmission:1000 
	      RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

wlan0_rename Link encap:Ethernet  HWaddr 00:18:DE:33:C9:22  
	      BROADCAST MULTICAST  MTU:1500  Metric:1
	      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
	      TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
	      collisions:0 lg file transmission:1000 
	      RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

=> eth2 should not be remaining and the name should be wlan0 (maybe a problem with udev ? according to yoho's comment : udev renames wmaster0 as eth2 then wlan0 as eth2, hence the kernel suggesting to use wlan0_rename to avoid the conflict).
The result of modprobe iwl3945 in /var/log/messages :
iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, 0.1.1d
iwl3945: Copyright(c) 2003-2007 Intel Corporation
ACPI: PCI Interrupt 0000:02:00.0[A] -> GSI 16 (level, low) -> IRQ 16
iwl3945: Detected Intel PRO/Wireless 3945ABG Network Connection
iwl3945: Unhandled INTA bits 0x04000000
iwl3945: Disabled INTA bits 0x04000000 were pending
iwl3945:    with FH_INT = 0x00000000
iwl3945: Channel 14 [2.4GHz] is Tx only -- skipping.
iwl3945: Channel 183 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 184 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 185 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 187 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 188 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 189 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 192 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 196 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 7 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 8 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 11 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 12 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 16 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 145 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 149 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 153 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 157 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 161 [5.2GHz] is Tx only -- skipping.
iwl3945: Channel 165 [5.2GHz] is Tx only -- skipping.
iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels


# iwlist wlan0_rename scan # strange error :/ I'll have to upgrade wireless-tools-28-3mdv2008.0
Warning: Driver for device wlan0_rename has been compiled with version 22
of Wireless Extension, while this program supports up to version 20.
Some things may be broken...
=> It works after doing ifconfig wlan0_rename up (see above)

some other tests - status: does not associate

check http://www.bughost.org/bugzilla/show_bug.cgi?id=1210
I'm using WPA TKIP/PSK encryption, currently not working (wpa_supplicant-0.5.8-1mdv2008.0), I copied /etc/sysconfig/network-scripts/ifcfg-eth2 to /etc/sysconfig/network-scripts/ifcfg-wlan0_rename (changing the DEVICE=eth2 to wlan0_rename of course)
ifup wlan0_rename
Wireless device wlan0_rename is configured with a roaming daemon but isn't associated
Determining IP information for wlan0_rename... failed; no link present.  Check cable?



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