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<author title="Developer"> |
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<author title="Developer"> |
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<mail link="latexer@gentoo.org">Peter Johanson</mail> |
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<mail link="latexer@gentoo.org">Peter Johanson</mail> |
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</author> |
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</author> |
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<author title="Editor"> |
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<license/> |
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<mail link="antifa@gentoo.org">Ken Nowack</mail> |
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</author> |
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<author title="Editor"> |
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<mail link="bennyc@gentoo.org">Benny Chuang</mail> |
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</author> |
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<abstract> |
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<abstract> |
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This guide covers how to use Gentoo's new "koutput" method to handle 2.6 |
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This guide covers how to use Gentoo's new "koutput" method to handle 2.6 |
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kernels and kernel modules. |
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kernels and kernel modules. |
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</abstract> |
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</abstract> |
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<license/> |
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<version>1.0</version> |
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<version>1.0</version> |
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<date>March 14, 2004</date> |
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<date>March 14, 2004</date> |
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<chapter> |
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<chapter> |
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<title>Overview</title> |
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<title>Overview</title> |
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<section> |
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<body> |
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<body> |
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old method: |
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old method: |
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</p> |
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<ol> |
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<ul> |
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<li> |
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<li> |
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Arbitrary users can all use the same sources to build kernels, outputting |
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Arbitrary users can all use the same sources to build kernels, outputting |
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to some location in their home directory. |
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to some location in their home directory. |
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External modules can be built without requiring write access to |
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External modules can be built without requiring write access to |
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<path>/usr/src/linux</path> |
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<path>/usr/src/linux</path> |
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</li> |
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</li> |
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</ol> |
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</ul> |
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<p> |
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This last fact is important, as previously portage would need to be given |
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This last fact is important, as previously portage would need to be given |
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kernel module emerges, you can use config-kernel: |
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kernel module emerges, you can use config-kernel: |
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</p> |
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</p> |
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<note>Not all of config-kernel's features are discussed in this guide. For the |
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<note> |
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rest of the information see <b>man config-kernel</b></note> |
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Not all of config-kernel's features are discussed in this guide. For the |
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rest of the information see <b>man config-kernel</b> |
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</note> |
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<pre caption="Enabling writing to /usr/src/linux"> |
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<pre caption="Enabling writing to /usr/src/linux"> |
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# <i>config-kernel --allow-writable yes</i> |
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# <i>config-kernel --allow-writable yes</i> |
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</pre> |
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</pre> |
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</section> |
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<chapter> |
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<title>Enabling koutput</title> |
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<title>Enabling koutput</title> |
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<section> |
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2.6 kernels determine where to output their files based on two environmental |
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2.6 kernels determine where to output their files based on two environmental |
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variables, <i>KBUILD_OUTPUT</i> and <i>O</i>. <i>KBUILD_OUTPUT</i> should be set |
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variables, <c>KBUILD_OUTPUT</c> and <c>O</c>. <c>KBUILD_OUTPUT</c> should be set |
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environmentally, and can then be overriden on the command line by specifying a |
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environmentally, and can then be overriden on the command line by specifying a |
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new <i>O</i> value. e.g.: |
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new <c>O</c> value. e.g.: |
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</p> |
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</p> |
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<pre caption="Setting an output by hand"> |
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<pre caption="Setting an output by hand"> |
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<p> |
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The above command converts the kernel found in <path>/usr/src/linux-2.6.3</path> |
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The above command converts the kernel found in <path>/usr/src/linux-2.6.3</path> |
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to outputting to a different directory. If the output directory has been set |
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to outputting to a different directory. If the output directory has been set |
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previously with <i>--output-dir=foo</i>, then that prefix will be used. |
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previously with <c>--output-dir=foo</c>, then that prefix will be used. |
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Otherwise, the Gentoo default of <path>/var/tmp/kernel-output/KV</path> will be |
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Otherwise, the Gentoo default of <path>/var/tmp/kernel-output/KV</path> will be |
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used. |
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used. |
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</p> |
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</body> |
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</section> |
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<chapter> |
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<chapter> |
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<title>Repercussions</title> |
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<title>Repercussions</title> |
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<section> |
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<body> |
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<p> |
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After configuring a kernel to use a different output directory, the changes go largly unnoticed when configuring and isntalling a kernel. A few key files change locations that you should be aware of though. The main files to be concered with are .config, and the generated bzImage after compiling a kernel. Below is a table showing the original and new locations for some key files. We assume the kernel is a 2.6.4 kernel outputting to the Gentoo default of <path>/var/tmp/kernel-output/2.6.4</path>. |
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After configuring to use a different output directory, the changes go largly |
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unnoticed when configuring and installing a kernel. There are a few key file |
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location changes that you should be aware of though. The main files to be |
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concered with are .config, and the generated bzImage after compiling a kernel. |
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Below is a table showing the original and new locations for these key files. The |
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table assumes a 2.6.4 kernel outputting to the Gentoo default of |
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<path>/var/tmp/kernel-output/2.6.4</path>. |
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</p> |
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</p> |
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<table> |
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<table> |
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</table> |
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</body> |
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</body> |
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</section> |
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</chapter> |
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</chapter> |
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</guide> |
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</guide> |
