Wi-Fi* Overview and Drivers
The Reference Operating System for IoT (Ref-OS-IoT) provides these Wi-Fi* features:
- 802.11 a/b/g/n/ac support
- WPA and WPA2, 802.1x
- Support Dual band (2.4 & 5 GHz)
- Wi-Fi* Direct
Firmware and Drivers
Ref-OS-IoT provides the
open source Linux kernel drivers; the drivers load the Wi-Fi* firmware during boot time.
This can be seen in dmesg with following line:
[
24.641377] iwlwifi 0000:01:00.0: loaded firmware version 27.455470.0 op_mode iwlmvm
Firmware is searched from /lib/firmware and the driver automatically selects the latest if multiple firmware versions are available.
root@intel-5xx-64:~# ls -la /lib/firmware/iwlwifi-8000C-*.ucode
-rw-r--r--
1 root
root
1745176 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-13.ucode
-rw-r--r--
1 root
root
2351636 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-16.ucode
-rw-r--r--
1 root
root
2383144 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-19.ucode
-rw-r--r--
1 root
root
2394060 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-21.ucode
-rw-r--r--
1 root
root
2120860 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-22.ucode
-rw-r--r--
1 root
root
2227284 Mar
8 00:45 /lib/firmware/iwlwifi-8000C-27.ucode
Files Copied to Root
T
Chipset firmware
/lib/firmware/iwlwifi-8000C-<version_number>.ucode
Kernel module configuration file
used when inserting the kernel driver with the command modprobe. /etc/modprobe.d/iwlwifi.conf
Driver module
/lib/modules/<kernel_version>/updates/iwlwifi.ko
Configuration file for wpa_supplicant
/etc/wpa_supplicant.conf
D
river Modules
To list driver modules, enter following:
$ lsmod
To load the driver module, enter the following:
$ modprobe iwlwifi
To remove the driver module, enter the following:
$ modprobe –r iwlwifi
This powers down the chipset, if it is not already powered down.
Manually powering Wi-Fi up or down
If the ifconfig command lists the wifi interface in its results, Wi-Fi is powered up. If it does not, Wi-Fi is powered down. The wireless chipset can be powered up or down with these commands:
rfkill unblock wifi
rfkill block wifi
From a terminal, use the ifconfig command to check if the network interface is configured
Note :The rfkill unblock/block wlan command is generally used to power up/down the WLAN.
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