Gumstix Overo wifi drops continously - embedded-linux

Question

I am using Gumstix overo and from the past many days I am unable to get my Wifi working correctly.
I followed the instructions from Gumstix Overo Wifi and Overo Wifi to set correct parameters in /etc/network/interfaces and /etc/wpa_supplicant.conf.
/etc/network/interfaces file:
# Wireless interfaces
auto wlan0
iface wlan0 inet dhcp
pre-up wpa_supplicant -Dwext -iwlan0 -c/etc/wpa_supplicant.conf -B
down killall -q wpa_supplicant
wpa_supplicant.conf:
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1
eapol_version=1
ap_scan=1
fast_reauth=1
network={
ssid="xxxxxx"
proto=WPA
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
scan_ssid=1
psk="xxxxx"
priority=10
}
After setting up and running ifdown wlan0 && ifup wlan0 i constantly get this message:
[ 1176.528778] cfg80211: Calling CRDA to update world regulatory domain
[ 2155.687255] cfg80211: Calling CRDA to update world regulatory domain
[ 1175.293609] cfg80211: Calling CRDA to update world regulatory domain
My iwconfig:
lo no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
My lsmod looks like this:
root#overo:~# lsmod
Module Size Used by
libertas_sdio 16484 0
libertas 99993 1 libertas_sdio
firmware_class 6920 2 libertas_sdio,libertas
ipv6 252525 22
cfg80211 172644 1 libertas
rfkill 17524 3 cfg80211
lib80211 5138 1 libertas
mt9v032 7169 1
omap3_isp 132270 0
v4l2_common 8681 2 omap3_isp,mt9v032
ads7846 10528 0
videodev 98880 3 omap3_isp,mt9v032,v4l2_common
media 12853 3 omap3_isp,mt9v032,videodev
I am using yocto project for gumstix cloned from https://github.com/gumstix/Gumstix-YoctoProject-Repo
It would be great help if I could get any inputs where I am doing wrong.

Answer 1

The reason for wifi drop is the Network manager. By disabling it we can run ifconfig, iwconfig without any interference from the NetworkManager.
or Another workaround is this which is quite successful:
After creating SD card with proper Image on, do not unmount the partitions.
Install a Custom systemd Service
To bring up the wireless interface on boot, you will need to create and install a custom systemd service on the microSD card.
In the rootfs partition, create a new service script:
$sudoedit /media/rootfs/etc/systemd/system/network-wireless#.service
Copy and paste the following into the file:
Description=Wireless network connectivity (%i)
Wants=network.target
Before=network.target
BindsTo=sys-subsystem-net-devices-%i.device
After=sys-subsystem-net-devices-%i.device
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/sbin/ifconfig %i up
ExecStart=/usr/sbin/wpa_supplicant -B -i %i -c /etc/wpa_supplicant.conf
ExecStart=/sbin/dhclient %i
RestartSec=1min
Restart=on-failure
ExecStop=/sbin/ifconfig %i down
[Install]
WantedBy=multi-user.target
Save this file.
Because we are editing these files on a development machine, the normal systemd method of enabling services (systemctl) will not work. To enable our new service:
~ Change into the multi-user.target.wants directory on the root filesystem:
$cd /media/rootfs/etc/systemd/system/multi-user.target.wants/
~ Create a symbolic link to enable the service:
Overo Series COMs
$sudo ln -s ../network-wireless#.service network-wireless#wlan0.service
Finally, edit the wpa_supplicant configuration file:
$sudoedit /media/rootfs/etc/wpa_supplicant.conf
Change it to look like the following:
network={
ssid="Your Network's SSID"
psk="Your WPA2 Passkey"
}
Save the file.
Unmount the partitions on the microSD card.
SSH Into Your System
1) If you don't know the ip $ssh root#overo.local
2) If you know the IP address $ssh root#192.xx.xx.xx.local