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1 <?xml version='1.0' encoding='UTF-8'?>
2 <!DOCTYPE sections SYSTEM "/dtd/book.dtd">
3
4 <!-- The content of this document is licensed under the CC-BY-SA license -->
5 <!-- See http://creativecommons.org/licenses/by-sa/1.0 -->
6
7 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/draft/hb-install-ppc-kernel.xml,v 1.16 2004/11/09 13:05:40 swift Exp $ -->
8
9 <sections>
10
11 <version>1.11</version>
12 <date>September 1, 2004</date>
13
14 <section>
15 <title>Timezone</title>
16 <body>
17
18 <p>
19 You first need to select your timezone so that your system knows where it is
20 located. Look for your timezone in <path>/usr/share/zoneinfo</path>, then make a
21 symlink to <path>/etc/localtime</path> using <c>ln</c>:
22 </p>
23
24 <pre caption="Setting the timezone information">
25 # <i>ls /usr/share/zoneinfo</i>
26 <comment>(Suppose you want to use GMT)</comment>
27 # <i>ln -sf /usr/share/zoneinfo/GMT /etc/localtime</i>
28 </pre>
29
30 </body>
31 </section>
32 <section>
33 <title>Installing the Sources</title>
34 <subsection>
35 <title>Choosing a Kernel</title>
36 <body>
37
38 <p>
39 The core around which all distributions are built is the Linux kernel. It is the
40 layer between the user programs and your system hardware. Gentoo provides its
41 users several possible kernel sources. A full listing with description is
42 available at the <uri link="/doc/en/gentoo-kernel.xml">Gentoo Kernel
43 Guide</uri>.
44 </p>
45
46 <p>
47 For PPC you can choose between <c>development-sources</c> and
48 <c>gentoo-dev-sources</c> (both 2.6 kernels). The latter is available when you
49 perform a networkless installation. Beside those there is a special
50 kernel-2.6-patchset for the Pegasos: <c>pegasos-dev-sources</c>. So let's
51 continue with <c>emerge</c>'ing the kernel sources:
52 </p>
53
54 <pre caption="Installing a kernel source">
55 # <i>emerge gentoo-dev-sources</i>
56 </pre>
57
58 <p>
59 When you take a look in <path>/usr/src</path> you should see a symlink called
60 <path>linux</path> pointing to your kernel source:
61 </p>
62
63 <pre caption="Viewing the kernel source symlink">
64 # <i>ls -l /usr/src/linux</i>
65 lrwxrwxrwx 1 root root 12 Jul 10 10:55 /usr/src/linux -&gt; linux-2.6.9
66 </pre>
67
68 <p>
69 If this isn't the case (i.e. the symlink points to a different kernel source)
70 change the symlink before you continue:
71 </p>
72
73 <pre caption="Changing the kernel source symlink">
74 # <i>rm /usr/src/linux</i>
75 # <i>cd /usr/src</i>
76 # <i>ln -s linux-2.6.9 linux</i>
77 </pre>
78
79 <p>
80 Now it is time to configure and compile your kernel source. All architectures
81 can use <c>genkernel</c> for this, which will build a generic kernel as used
82 by the LiveCD. We explain the "manual" configuration first though, as it is
83 the best way to optimize your environment.
84 </p>
85
86 <p>
87 Continue now with <uri link="#manual">Manual Configuration</uri>.
88 </p>
89
90 </body>
91 </subsection>
92 </section>
93 <section id="manual">
94 <title>Manual Configuration</title>
95 <subsection>
96 <title>Introduction</title>
97 <body>
98
99 <p>
100 Manually configuring a kernel is often seen as the most difficult procedure a
101 Linux user ever has to perform. Nothing is less true -- after configuring a
102 couple of kernels you don't even remember that it was difficult ;)
103 </p>
104
105 <p>
106 However, one thing <e>is</e> true: you must know your system when you start
107 configuring a kernel manually. Most information can be gathered by viewing the
108 contents of <path>/proc/pci</path> (or by using <c>lspci</c> if available). You
109 can also run <c>lsmod</c> to see what kernel modules the LiveCD uses (it might
110 provide you with a nice hint on what to enable).
111 </p>
112
113 <p>
114 Now go to your kernel source directory and execute <c>make menuconfig</c>. This
115 will fire up an ncurses-based configuration menu.
116 </p>
117
118 <pre caption="Invoking menuconfig">
119 # <i>cd /usr/src/linux</i>
120 # <i>make menuconfig</i>
121 </pre>
122
123 <p>
124 You will be greeted with several configuration sections. We'll first list some
125 options you must activate (otherwise Gentoo will not function, or not function
126 properly without additional tweaks).
127 </p>
128
129 </body>
130 </subsection>
131 <subsection>
132 <title>Activating Required Options</title>
133 <body>
134
135 <p>
136 First of all, activate the use of development and experimental code/drivers.
137 You need this, otherwise some very important code/drivers won't show up:
138 </p>
139
140 <pre caption="Selecting experimental code/drivers">
141 Code maturity level options ---&gt;
142 [*] Prompt for development and/or incomplete code/drivers
143 </pre>
144
145 <p>
146 Now go to <c>File Systems</c> and select support for the filesystems you use.
147 <e>Don't</e> compile them as modules, otherwise your Gentoo system will not be
148 able to mount your partitions. Also select <c>Virtual memory</c>, <c>/proc
149 file system</c>, <c>/dev file system</c> + <c>Automatically mount at boot</c>:
150 </p>
151
152 <pre caption="Selecting necessary file systems">
153 File systems ---&gt;
154 Pseudo Filesystems ---&gt;
155 [*] /proc file system support
156 [*] /dev file system support (OBSOLETE)
157 [*] Automatically mount at boot
158 [*] Virtual memory file system support (former shm fs)
159
160 <comment>(Select one or more of the following options as needed by your system)</comment>
161 &lt;*&gt; Reiserfs support
162 &lt;*&gt; Ext3 journalling file system support
163 &lt;*&gt; Second extended fs support
164 &lt;*&gt; XFS filesystem support
165 </pre>
166
167 <p>
168 If you are using PPPoE to connect to the Internet or you are using a dial-up
169 modem, you will need the following options in the kernel:
170 </p>
171
172 <pre caption="Selecting PPPoE necessary drivers">
173 Device Drivers ---&gt;
174 Networking support ---&gt;
175 &lt;*&gt; PPP (point-to-point protocol) support
176 &lt;*&gt; PPP support for async serial ports
177 &lt;*&gt; PPP support for sync tty ports
178 </pre>
179
180 <p>
181 The two compression options won't harm but are not definitely needed, neither
182 does the <c>PPP over Ethernet</c> option, that might only be used by
183 <c>rp-pppoe</c> when configured to do kernel mode PPPoE.
184 </p>
185
186 <p>
187 If you require it, don't forget to include support in the kernel for your
188 ethernet card.
189 </p>
190
191 <p>
192 Disable ADB raw keycodes:
193 </p>
194
195 <pre caption="Disabling ADB raw keycodes">
196 Macintosh Device Drivers ---&gt;
197 [ ] Support for ADB raw keycodes
198 </pre>
199
200 <p>
201 Also choose the correct RTC support (<e>disable</e> the <c>Enhanced RTC</c>
202 option):
203 </p>
204
205 <pre caption="Activating the correct RTC option">
206 Character devices ---&gt;
207 [ ] Enhanced RTC
208
209 General setup ---&gt;
210 [*] Support for /dev/rtc
211 </pre>
212
213 <p>
214 Users of OldWorld machines will want HFS support so they can copy compiled
215 kernels to the MacOS partition.
216 </p>
217
218 <pre caption="Activating HFS support">
219 File Systems ---&gt;
220 [*] HFS Support
221 </pre>
222
223 <p>
224 When you're done configuring your kernel, continue with <uri
225 link="#compiling">Compiling and Installing</uri>.
226 </p>
227
228 </body>
229 </subsection>
230 <subsection id="compiling">
231 <title>Compiling and Installing</title>
232 <body>
233
234 <p>
235 Now that your kernel is configured, it is time to compile and install it. Exit
236 the configuration and run the commands which will compile the kernel:
237 </p>
238
239 <pre caption="Compiling the kernel">
240 # <i>make all &amp;&amp; make modules_install</i>
241 </pre>
242
243 <p>
244 When the kernel has finished compiling, copy the kernel image to
245 <path>/boot</path>.
246 </p>
247
248 <pre caption="Installing the kernel">
249 <comment>replace 2.6.9 with your kernel-version</comment>
250 (Apple/IBM) # <i>cp vmlinux /boot/kernel-2.6.9</i>
251 (Pegasos) # <i>cp arch/ppc/boot/images/zImage.chrp /boot/kernel-2.6.9</i>
252 </pre>
253
254 <p>
255 Also don't forget to copy over the system map:
256 </p>
257
258 <pre caption="Copying the system map">
259 # <i>cp System.map /boot/System.map-2.6.9</i>
260 </pre>
261
262 <p>
263 It is also wise to copy over your kernel configuration file to
264 <path>/boot</path>, just in case :)
265 </p>
266
267 <pre caption="Backing up your kernel configuration">
268 # <i>cp .config /boot/config-2.6.9</i>
269 </pre>
270
271 <p>
272 Now continue with <uri link="#kernel_modules">Installing Separate Kernel
273 Modules</uri>.
274 </p>
275
276 </body>
277 </subsection>
278 </section>
279 <section id="kernel_modules">
280 <title>Installing Separate Kernel Modules</title>
281 <subsection>
282 <title>Configuring the Modules</title>
283 <body>
284
285 <p>
286 You should list the modules you want automatically loaded in
287 <path>/etc/modules.autoload.d/kernel-2.6</path>.
288 You can add extra options to the modules too if you want.
289 </p>
290
291 <p>
292 To view all available modules, run the following <c>find</c> command. Don't
293 forget to substitute "&lt;kernel version&gt;" with the version of the kernel you
294 just compiled:
295 </p>
296
297 <pre caption="Viewing all available modules">
298 # <i>find /lib/modules/&lt;kernel version&gt;/ -type f -iname '*.o' -or -iname '*.ko'</i>
299 </pre>
300
301 <p>
302 For instance, to automatically load the <c>3c59x.o</c> module, edit the
303 <path>kernel-2.6</path> file and enter the module
304 name in it.
305 </p>
306
307 <pre caption="Editing /etc/modules.autoload.d/kernel-2.6">
308 # <i>nano -w /etc/modules.autoload.d/kernel-2.6</i>
309 </pre>
310
311 <pre caption="/etc/modules.autoload.d/kernel-2.6">
312 3c59x
313 </pre>
314
315 <p>
316 Now run <c>modules-update</c> to commit your changes to the
317 <path>/etc/modules.conf</path> file:
318 </p>
319
320 <pre caption="Running modules-update">
321 # <i>modules-update</i>
322 </pre>
323
324 <p>
325 Continue the installation with <uri link="?part=1&amp;chap=8">Configuring
326 your System</uri>.
327 </p>
328
329 </body>
330 </subsection>
331 </section>
332 </sections>

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