Author: xry111
Date: Thu Aug 13 13:11:16 2020
New Revision: 23512
Log:
firmware: add a paragraph about regulatory.db
Modified:
trunk/BOOK/postlfs/config/firmware.xml
Modified: trunk/BOOK/postlfs/config/firmware.xml
==============================================================================
--- trunk/BOOK/postlfs/config/firmware.xml Thu Aug 13 10:05:09 2020
(r23511)
+++ trunk/BOOK/postlfs/config/firmware.xml Thu Aug 13 13:11:16 2020
(r23512)
@@ -659,6 +659,23 @@
</para>
<para>
+ Different countries have different regulations on the radio spectrum
+ usage of wireless devices. You can install a firmware to make the
+ wireless devices obey local spectrum regulations, so you won't be
+ inquired by local authority or find your wireless NIC jamming the
+ frequencies of other devices (for example, remote controllers).
+ The regulatory database firmware can be downloaded from
+ <ulink url = 'https://kernel.org/pub/software/network/wireless-regdb/'/>.
+ To install it, simply extract <filename>regulatory.db</filename> and
+ <filename>regulatory.db.p7s</filename> from the tarball into
+ <filename class="directory">/lib/firmware</filename>.
+ The access point would send a country code to your wireless NIC,
+ and <xref linkend='wpa_supplicant'/> would tell the kernel to load
+ the regulation of this country from
+ <filename>regulatory.db</filename>, and enforce it.
+ </para>
+
+ <para>
Firmware may also be needed for other devices such as some SCSI
controllers, bluetooth adaptors, or TV recorders. The same principles
apply.
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