[Grml] hints about grml 0.9 on HD and ipw3945

[Michael Prokop]

* Lars Schimmer <l.schimmer at cgv.tugraz.at> [20061211 00:15]:

> Today I installed grml 0.9 (two times) to HD with grm2hd.
> If I boot with the CD the autoconf detects eth0 (e1000) and eth1
> (ipw3945) from my T60 laptop.
> After install on HD and reboot the system just recognize eth0.
[...]

Ok, today I found the time to take a closer look at the problem at
Lars' hardware (thanks for the coffee, Lars :-)).

JFTR: ipw3945 definitely has some race condition problems.
To fix this problem on your Debian/grml system just take a look at
my howto:

################################################################################
We want to avoid autoloading of the ipw3945 module at boottime, so we
blacklist the module:

# cat /etc/modprobe.d/grml
blacklist ipw3945

Now create a new initscript which loads the driver:

# cat /etc/init.d/ipwfix
#!/bin/sh
grep -q ipw3945 /proc/modules && rmmod ipw3945
modprobe ipw3945

Then make sure the initscript is used before /etc/init.d/networking
is running:

# update-rc.d ipwfix start 34 S .

Notice a problem with /etc/resolv.conf? I couldn't debug it in
detail due to lack of time but the problem definitely goes away if
you do not use the package resolvconf, so just run:

# apt-get --purge remove resolvconf

We want to have persistent interface names so we bind ipw3945 to
interface name wlan0 via udev (see 'grml-tips udev' for details):

# INTERFACE=wlan0 /lib/udev/write_net_rules 00:13:02:aa:bb:cc

Finally configure your WLAN device as usual via /etc/network/interface
(and make sure you have CONFIG_DHCP=no in /etc/grml/autoconfig on
your grml-system), for example it might look like the following for
a WPA setup:

# cat /etc/network/interfaces
auto lo wlan0
iface lo inet loopback

iface wlan0 inet dhcp
 wireless-mode Managed
 wireless-essid secret
 pre-up wpa_supplicant -Dwext -iwlan0 -c/etc/wpa_supplicant.conf -B
 down killall wpa_supplicant
################################################################################

regards,
-mika-
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