I work on embedded device and I am configuring the WLAN module (QCA6174 - ath10k driver) with wpa_supplicant.
I load the driver modules (backports-20151120):
insmod /lib/modules/3.10.65-b2196-h301/wlan/compat.ko;
insmod lib/modules/3.10.65-b2196-h301/wlan/cfg80211.ko;
insmod /lib/modules/3.10.65-b2196-h301/wlan/mac80211.ko;
insmod /lib/modules/3.10.65-b2196-h301/wlan/ath.ko;
insmod /lib/modules/3.10.65-b2196-h301/wlan/ath10k_core.ko skip_otp=y;
insmod /lib/modules/3.10.65-b2196-h301/wlan/ath10k_pci.ko
I start the wpa_supplicant (default wpa_supplicant.conf):
wpa_supplicant -dd -Dwext -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf -B
[ 182.257304] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
everything seems to work fine. I see the wlan0 interface,I can scan with iwlist, /var/run/wpa_supplicant/wlan0 exist.
But I can not use wpa_cli interface:
#wpa_cli
wpa_cli v2.4
Copyright (c) 2004-2015, Jouni Malinen <[email protected]> and contributors
Selected interface 'wlan0'
Interactive mode
Could not connect to wpa_supplicant: wlan0 - re-trying
Do you have any hints how can I track down the problem ?
After issuing
strace wpa_cli -i wlan0
the problem with /tmp folder was reported:
bind(3, {sa_family=AF_FILE, path="/tmp/wpa_ctrl_1095-5"}, 110) = -1 EROFS (Read-only file system)
After mounting tmpfs:
mount -t tmpfs -o size=12m tmpfs /tmp/
everything works fine.