| 1 | <?xml version="1.0" encoding="UTF-8"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="wireless-kernel" xreflabel="Configuring the Linux Kernel for Wireless">
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| 9 | <?dbhtml filename="wireless-kernel.html"?>
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| 10 |
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| 11 |
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| 12 | <title>Configuring the Linux Kernel for Wireless</title>
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| 13 |
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| 14 | <para>
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| 15 | Before using any userspace tools for connecting to a wireless AP,
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| 16 | the Linux kernel must be configured to drive the wireless NIC properly.
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| 17 | Enable the following options in the kernel configuration as well as
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| 18 | specific device drivers for your hardware and recompile the kernel if
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| 19 | necessary:
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| 20 | </para>
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| 21 |
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| 22 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 23 | href="wireless-kernel-kernel.xml"/>
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| 24 |
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| 25 | <para>
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| 26 | Open the <quote>Wireless LAN</quote> submenu and select the options that
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| 27 | support your hardware. <command>lspci</command> from
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| 28 | <xref linkend="pciutils"/> or <command>lsusb</command> from
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| 29 | <xref linkend="usbutils"/> can be used to
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| 30 | view your hardware configuration. Note that many (though not all)
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| 31 | options for the wireless NICs depend on
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| 32 | <parameter>CONFIG_MAC80211</parameter>. After the correct drivers are
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| 33 | loaded, the interface will appear in
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| 34 | <filename>/sys/class/net</filename>, or in the output of the
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| 35 | <command>ip link</command> command.
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| 36 | </para>
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| 37 |
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| 38 | <para>
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| 39 | Many wireless NIC drivers require firmware. If you've enabled the
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| 40 | correct driver in the kernel configuration but it fails to load (with
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| 41 | messages like <quote><computeroutput>Direct firmware load for
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| 42 | <replaceable><filename</replaceable>> failed with error
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| 43 | -2</computeroutput></quote>, it means that you need to install the firmware
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| 44 | or the wireless NIC won't work. Read <xref linkend='postlfs-firmware'/>
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| 45 | for more details.
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| 46 | </para>
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| 47 |
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| 48 | </sect1>
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