Changes between Initial Version and Version 1 of OpenWrt/wireless

Timestamp:

10/22/2017 05:28:45 AM (8 years ago)

Author:

trac

Comment:

--

OpenWrt/wireless

@@ +1 @@
+[[PageOutline]]
+
+This information has been tested and created for use on the Gateworks Single Board Computers (SBCs)''', specifically the Ventana family that utilizes the Freescale i.MX6 processors. 
+
+Gateworks SBCs can be viewed at the following link: [http://www.gateworks.com]
+
+[[Image(http://trac.gateworks.com/raw-attachment/wiki/OpenWrt/wireless/relayd/gw5100realsmall.png,200px)]]
+= OpenWrt 802.11 Wireless =
+
+For wireless info regarding to other BSP's see:
+ * [wiki:Yocto/Wireless Yocto wireless networking]
+ * [wiki:Android#WirelessNetworking Android wireless networking]
+
+== General Configuration ==
+OpenWrt its own system configuration called Unified Configuration Interface or [http://wiki.openwrt.org/doc/uci UCI]. You can use the '''uci''' command-line utility to get/set configuration or edit the files directly under /system/config (if you know what your doing). Often we will provide uci command-line examples because these can be easily cut-n-pasted into a shell.
+
+Wireless radio configuration is contained in /etc/config/wireless, but the network configuration is contained in /etc/config/network. Each physical radio has a 'wifi-device' config section and each virtual interface (there is always one or more per physical radio) has a 'wifi-iface' config section that also specifies a 'network' config that links back to a section in /etc/config/network.
+
+Example configuration for a single radio (WLE300NX 802.11N) with a wireless Access Point:
+ * looking at /etc/config/wireless
+{{{
+root@OpenWrt:/# cat /etc/config/wireless 
+config wifi-device  radio0
+        option type     mac80211
+        option channel  11
+        option hwmode   11ng
+        option path     pci0001:00/0001:00:01.0
+        option htmode   HT20
+        list ht_capab   LDPC
+        list ht_capab   SHORT-GI-20
+        list ht_capab   SHORT-GI-40
+        list ht_capab   TX-STBC
+        list ht_capab   RX-STBC1
+        list ht_capab   DSSS_CCK-40
+
+config wifi-iface
+        option device   radio0
+        option network  lan
+        option mode     ap
+        option ssid     OpenWrt
+        option encryption none
+}}}
+ * using UCI:
+{{{
+root@OpenWrt:/# uci show wireless
+wireless.radio0=wifi-device
+wireless.radio0.type=mac80211
+wireless.radio0.channel=11
+wireless.radio0.hwmode=11ng
+wireless.radio0.path=pci0001:00/0001:00:01.0
+wireless.radio0.htmode=HT20
+wireless.radio0.ht_capab=LDPC SHORT-GI-20 SHORT-GI-40 TX-STBC RX-STBC1 DSSS_CCK-40
+wireless.@wifi-iface[0]=wifi-iface
+wireless.@wifi-iface[0].device=radio0
+wireless.@wifi-iface[0].network=lan
+wireless.@wifi-iface[0].mode=ap
+wireless.@wifi-iface[0].ssid=OpenWrt
+wireless.@wifi-iface[0].encryption=none
+}}}
+
+
+For more info:
+ * [http://wiki.openwrt.org/doc/uci/wireless OpenWrt Wiki for Wireless]
+ * [http://wiki.openwrt.org/doc/uci OpenWrt UCI]
+
+
+== Adding a Wireless Radio ==
+Here are the steps to add a wireless radio to your board:
+ 1. Insert Wireless Card into Mini-PCI / Mini-PCIe slot.
+ 2. Power on and boot Gateworks Single Board Computer
+ 3. The wireless configuration is located in the file /etc/config/wireless. Run the command '''cat /etc/config/wireless''' to display this file and ensure your device is detected (each physical radio will have a 'wifi-device' section with the 'macaddr' option matching the unique MAC address of the radio
+ 4. By default newly detected wireless devices are disabled. You will have to comment out or remove the 'option disabled 1' in the appropriate wifi-device section.
+
+
+== Re-detecting Wireless Radios ==
+If something happens to your /etc/config/wireless file, you can force a re-detection with:
+{{{
+wifi detect > /etc/config/wireless
+}}}
+
+
+== Enabling a Wireless Radio ==
+By default OpenWrt does not enable the radios it detects. You must do this using the LuCI web-admin or via shell commands.
+
+Using UCI shell command to enable radio0:
+{{{
+uci delete wireless.radio0.disabled
+uci commit
+}}}
+
+
+== Radio Identification ==
+Each Physical radio detected in a system has a 'wifi-device' section. Which radio each section pertains to is specified by either:
+ * a 'macaddr' linking the config section to a specific radio regardless of bus/slot it is detected on (making it easy to move radios around in physical slots if that is your desire). For example:
+{{{
+        option macaddr  '04:f0:21:01:3d:02'
+}}}
+ * a 'path' pointing to a specific bus/slot (making it easy to refer to a radio in a specific physical location regardless of the radio's unique mac address or order of detection. For example the following specifies the first slot on the first PCI bus:
+{{{
+        option path     'pci0001:00/0001:00:01.0'
+}}}
+ * a 'phy' pointing to the order the radio was detected in the system (making it easy to refer to the 'first' radio detected (''phy0'') or the 'second' radio detected (''phy1'') for example)
+{{{
+        option phy      'phy0'
+}}}
+
+== Troubleshooting ==
+Here are the common pitfalls of OpenWrt wireless configuration:
+ * If the '''/etc/config/wireless''' file does not exist or does not contain a 'wifi-device' section matching your card, the card is not being detected
+  * use the latest Gateworks OpenWrt BSP for the latest wireless drivers
+  * If the drivers that are loaded on the system do not support the card, the card will not come up.   
+  * Be sure the proper wireless drivers are loaded on the system for the wireless chipset being used. Using the command '''opkg list''' will show installed packages and drivers.
+  * Check to see if the card shows up when using shell commands '''lspci''' (for miniPCI and miniPCIe based cards) or '''lsusb''' (for USB based cards)
+   * If not then the card is not getting powered, the slot it is in does not have USB or PCI routed to it, or the card is malfunctioning.
+ * Make sure you have 'enabled' the card (see above). By default OpenWrt puts newly detected cards in the disabled state (option disabled 1)
+
+
+== Driver Support ==
+OpenWrt uses a fairly modern Linux kernel and drivers from the Linux Backports project which provides support for drivers for many common 802.11 devices.
+
+Some popular drivers (and notes specific to them are):
+ * ath9k (802.11n based Qualcomm / Atheros cards):
+  * htmod can be set to HT20 (20MHz channel width), HT40- or HT40+ (40MHz channel widths)
+ * ath10k (802.11ac based Qualcomm / Atheros cards):
+  * htmode can be set to VHT40 (40MHz channel width), VHT80 (80MHz channel width), VHT160 (160MHz channel width, if your card supports it)
+  * Sample 802.11AC configuration file for !OpenWrt in /etc/config/wireless using a ACE-DB-3 Doodle Lab Wireless Card in Access Point Mode with a SSID of OpenWrt and no security below:
+{{{
+config wifi-device  radio0
+        option type     mac80211
+        option channel  157
+        option hwmode   11a
+        option path     'soc0/soc.0/1ffc000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:05.0/0000:05:00.0'
+        option htmode   VHT80
+
+config wifi-iface
+        option device   radio0
+        option network  lan
+        option mode     ap
+        option ssid     OpenWrt
+        option encryption none
+}}}
+
+== Wireless Configurations ==
+ * [wiki:OpenWrt/wireless/access_point standard Access Point]
+ * [wiki:OpenWrt/wireless/client standard Wireless client (without Bridging)]
+ * [wiki:OpenWrt/wireless/wireless_bridge Wireless Bridge - Layer2 bridge using wireless and WDS]
+ * [wiki:OpenWrt/wireless/relayd relayd - Bridge like Client Mode (when using an AP w/o WDS]
+
+ * [wiki:performance_tuning#WirelessTuning Wireless Throughput Tuning for Higher Numbers]
+
+== Networking == 
+ * [wiki:OpenWrt/network_config Configure Network settings such as IP Address]
+