| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
|
|---|
| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|---|
| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
|---|
| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
|
|---|
| 5 | %general-entities;
|
|---|
| 6 | ]>
|
|---|
| 7 |
|
|---|
| 8 | <sect1 id="wireless-kernel" xreflabel="Configure the Linux Kernel for Wireless">
|
|---|
| 9 | <?dbhtml filename="wireless-kernel.html"?>
|
|---|
| 10 |
|
|---|
| 11 |
|
|---|
| 12 | <title>Configure the Linux Kernel for Wireless</title>
|
|---|
| 13 |
|
|---|
| 14 | <para>
|
|---|
| 15 | Before using any userspace tool for connecting with a wireless AP,
|
|---|
| 16 | the Linux kernel must be configured to drive the wireless NIC properly.
|
|---|
| 17 | Enable the following options in the kernel configuration as well as
|
|---|
| 18 | specific device drivers for your hardware and recompile the kernel if
|
|---|
| 19 | necessary:
|
|---|
| 20 | </para>
|
|---|
| 21 |
|
|---|
| 22 | <screen><literal>[*] Networking support ---> [CONFIG_NET]
|
|---|
| 23 | [*] Wireless ---> [CONFIG_WIRELESS]
|
|---|
| 24 | <*/M> cfg80211 - wireless configuration API [CONFIG_CFG80211]
|
|---|
| 25 | < /*/M> Generic IEEE 802.11 Networking Stack (mac80211) [CONFIG_MAC80211]
|
|---|
| 26 | Device Drivers --->
|
|---|
| 27 | [*] Network device support ---> [CONFIG_NETDEVICES]
|
|---|
| 28 | [*] Wireless LAN ---> [CONFIG_WLAN]</literal></screen>
|
|---|
| 29 |
|
|---|
| 30 | <para>
|
|---|
| 31 | Open the <quote>Wireless LAN</quote> submenu and select the options that
|
|---|
| 32 | support your hardware. <command>lspci</command> from
|
|---|
| 33 | <xref linkend="pciutils"/> or <command>lsusb</command> from
|
|---|
| 34 | <xref linkend="usbutils"/> can be used to
|
|---|
| 35 | view your hardware configuration. Note that many (though not all)
|
|---|
| 36 | options for the wireless NICs depend on
|
|---|
| 37 | <parameter>CONFIG_MAC80211</parameter>. After the correct drivers are
|
|---|
| 38 | loaded, the interface will appear in
|
|---|
| 39 | <filename>/sys/class/net</filename>, or the output of the
|
|---|
| 40 | <command>ip link</command> command.
|
|---|
| 41 | </para>
|
|---|
| 42 |
|
|---|
| 43 | <para>
|
|---|
| 44 | Many wireless NIC drivers require a firmware. If you've enabled the
|
|---|
| 45 | correct driver in the kernel configuration but it fails to load (with
|
|---|
| 46 | the messages like <quote><computeroutput>Direct firmware load for
|
|---|
| 47 | <replaceable><filename</replaceable>> failed with error
|
|---|
| 48 | -2</computeroutput></quote>, it means you need to install the firmware
|
|---|
| 49 | or the wireless NIC won't work. Read <xref linkend='postlfs-firmware'/>
|
|---|
| 50 | for details.
|
|---|
| 51 | </para>
|
|---|
| 52 |
|
|---|
| 53 | </sect1>
|
|---|
