Workaround for WiFi timing out at boot although board has no WiFi

[tobozo]

Hi, thanks for maintaining that awesome project!

I have a rpi2b plugged to the lan, this board doesn't have a wifi chip.

Problem: boot time was over 5mn because "sys-subsystem-net-devices-wlan0.device" waited for a timeout before enabling the ethernet connection.

The boot logic seems to assume there's WiFi in every situation, is there any particular reason why WiFi features are enabled even on rpi boards without WiFi chip?

[   10.296005] systemd[1]: Expecting device sys-subsystem-net-devices-wlan0.device - /sys/subsystem/net/devices/wlan0...

$ systemctl status sys-subsystem-net-devices-wlan0.device
○ sys-subsystem-net-devices-wlan0.device - /sys/subsystem/net/devices/wlan0
     Loaded: loaded
     Active: inactive (dead)

Dec 06 12:59:45 octoprint systemd[1]: sys-subsystem-net-devices-wlan0.device: Job sys-subsystem-net-devices-wlan0.device/start timed out.
Dec 06 12:59:45 octoprint systemd[1]: Timed out waiting for device sys-subsystem-net-devices-wlan0.device - /sys/subsystem/net/devices/wlan0.
Dec 06 12:59:45 octoprint systemd[1]: sys-subsystem-net-devices-wlan0.device: Job sys-subsystem-net-devices-wlan0.device/start failed with result 'timeout'.

The wifi timeout at boot went away after I ran the following commands from the shell:

systemctl disable now sys-subsystem-net-devices-wlan0.device
systemctl disable now wifi_powersave@off.service
systemctl disable now copy-network-manager-config@wlan0.service

[guysoft]

I guess you fixed it?

[tobozo]

Hi,

the fix was applied manually the day I created this issue, as shared:

systemctl disable now sys-subsystem-net-devices-wlan0.device
systemctl disable now wifi_powersave@off.service
systemctl disable now copy-network-manager-config@wlan0.service

The pi2b isn't the only one without WiFi:

• Raspberry Pi 1 Model B/B+
• Raspberry Pi 2 Model B
• Raspberry Pi Zero (original) / Zero 1.3
• Some compute module variants (non-wireless)

I'm not sure how and if OctoPi can do anything about it. Could it confirm the presence of WiFi chip or detect the pi model/variant before enabling those units during install?