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1 <!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook V4.1-Based Extension//EN" [
2 <!ENTITY % articles.ent PUBLIC "-//FreeBSD//ENTITIES DocBook FreeBSD Articles Entity Set//EN">
3 %articles.ent;
4
5 <!ENTITY % release PUBLIC "-//FreeBSD//ENTITIES Release Specification//EN">
6 %release;
7 ]>
8
9 <article>
10 <articleinfo>
11   <title>&os; &release.current; Release Notes</title>
12
13   <corpauthor>The &os; Project</corpauthor>
14
15   <pubdate>$FreeBSD$</pubdate>
16
17   <copyright>
18     <year>2012</year>
19     <holder role="mailto:doc@FreeBSD.org">The &os; Documentation Project</holder>
20   </copyright>
21
22   <legalnotice id="trademarks" role="trademarks">
23     &tm-attrib.freebsd;
24     &tm-attrib.ibm;
25     &tm-attrib.ieee;
26     &tm-attrib.intel;
27     &tm-attrib.sparc;
28     &tm-attrib.general;
29   </legalnotice>
30
31   <abstract>
32     <para>The release notes for &os; &release.current; contain a summary
33       of the changes made to the &os; base system on the
34       &release.branch; development line.
35       This document lists applicable security advisories that were issued since
36       the last release, as well as significant changes to the &os;
37       kernel and userland.
38       Some brief remarks on upgrading are also presented.</para>
39   </abstract>
40 </articleinfo>
41
42 <sect1 id="intro">
43   <title>Introduction</title>
44
45   <para>This document contains the release notes for &os;
46     &release.current;.  It
47     describes recently added, changed, or deleted features of &os;.
48     It also provides some notes on upgrading
49     from previous versions of &os;.</para>
50
51   <para>This distribution of &os; &release.current; is a
52     &release.type; distribution.  It can be found at <ulink
53     url="&release.url;"></ulink> or any of its mirrors.  More
54     information on obtaining this (or other) &release.type;
55     distributions of &os; can be found in the <ulink
56     url="&url.books.handbook;/mirrors.html"><quote>Obtaining
57     &os;</quote> appendix</ulink> to the <ulink
58     url="&url.books.handbook;/">&os;
59     Handbook</ulink>.</para>
60
61   <para>All users are encouraged to consult the release errata before
62     installing &os;.  The errata document is updated with
63     <quote>late-breaking</quote> information discovered late in the
64     release cycle or after the release.  Typically, it contains
65     information on known bugs, security advisories, and corrections to
66     documentation.  An up-to-date copy of the errata for &os;
67     &release.current; can be found on the &os; Web site.</para>
68
69 </sect1>
70
71 <sect1 id="new">
72     <title>What's New</title>
73
74     <para>The changes since the previous release can be found at
75       <ulink url="http://www.FreeBSD.org/releases/9.1R/relnotes.html"></ulink>.</para>
76 </sect1>
77
78 <sect1 id="upgrade">
79   <title>Upgrading from previous releases of &os;</title>
80
81     <sect2>
82       <title>Upgrading using freebsd-update(8) or a source-based
83         procedure</title>
84
85   <para arch="amd64,i386">Beginning with &os; 6.2-RELEASE,
86     binary upgrades between RELEASE versions (and snapshots of the
87     various security branches) are supported using the
88     &man.freebsd-update.8; utility.  The binary upgrade procedure will
89     update unmodified userland utilities, as well as a unmodified GENERIC kernel
90     distributed as a part of an official &os; release.
91     The &man.freebsd-update.8; utility requires that the host being
92     upgraded have Internet connectivity.</para>
93
94   <para>Source-based upgrades (those based on recompiling the &os;
95     base system from source code) from previous versions are
96     supported, according to the instructions in
97     <filename>/usr/src/UPDATING</filename>.</para>
98
99       <para>For more specific information about upgrading
100         instructions, see <ulink
101         url="http://www.FreeBSD.org/releases/9.1R/installation.html"></ulink>.</para>
102
103   <important>
104     <para>Upgrading &os; should, of course, only be attempted after
105       backing up <emphasis>all</emphasis> data and configuration
106       files.</para>
107   </important>
108     </sect2>
109
110     <sect2>
111       <title id="upgrade-pitfalls">User-visible incompatibilities</title>
112
113       <para>FreeBSD 9.0 and later have several incompatiblities in
114         system configuration which you might want to know before
115         upgrading your system.  <emphasis>Please read this section and
116         the <ulink
117         url="http://www.freebsd.org/releases/9.0R/relnotes-detailed.html#UPGRADE">Upgrading Section in 9.0-RELEASE Release Notes</ulink> carefully before submitting a problem report
118         and/or posting a question to the FreeBSD mailing
119         lists.</emphasis></para>
120     </sect2>
121   </sect1>
122 </article>