Thanks for the reminder. I removed the network-wireless@.service and kept the wpa_supplicant@.service. Now after the initial failed start up, finally got the "wlan0 link is ready". However, ifconfig found only the IPv6 address instead of the IPv4 address. I have no ideas of IPv6 and just want to realize WLAN communication with the host machine. Is there a way to change this? Thanks again.


On Fri, Dec 13, 2013 at 11:46 AM, adam [via Gumstix] <[hidden email]> wrote:
Hi Eric! Sorry I forgot we had an excellent how-to guide already :) 
My apologies for the confusion. Either service should work. You don't need both. 
As per your error message, have you waited out for a minute after the first time you saw that message?
The service fails the very first time, but it automatically tries again and succeeds after a min. In other words, it is not the perfect solution. 
Let me know,


On Thu, Dec 12, 2013 at 7:23 PM, Eric97 [via Gumstix] <[hidden email]> wrote:
Hi Adam,

I am using the Gumstix Overo with yocto build
I tried your method to enable the wpa_supplicant service. Besides, I did the following
1. Remove the wlan0 setup script in /etc/network/interfaces;
2. Add the systemd service to start the wifi as suggested here: 
So total two systemd services needed to bring the wifi up?

But cannot work and show the error "IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready". I am also wondering the wireless networking can use IPv4 instead? Thanks a lot.


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