hi,
I problem with knoppix 4.0.2 kernel 2.6.13, when i run

wpa_supplicant -D ipw -i eth0 -c /etc/wpa_supplicant.conf

i got:
ioctl[SIOCSIWPMKSA]: Operation not supported

Trying to associate with 00:13:10:05:c6:b1 (SSID='ABCD' freq=0 MHz)

ioctl[IPW_IOCTL_WPA_SUPPLICANT]: Invalid argument

Authentication with 00:00:00:00:00:00 timed out.

Trying to associate with 00:13:10:05:c6:b1 (SSID='ABCD' freq=0 MHz)

ioctl[IPW_IOCTL_WPA_SUPPLICANT]: Invalid argument

CTRL-EVENT-TERMINATING - signal 2 received
this is my wpa_supplicant.conf:
network={
ssid="ABC"
#psk="my_key"
psk=my_key_hash
}
i think it need a patch for ipw2100

thanks for any advance help