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The 2.6 kernel, among other things, provides many enhancements to the kernel |
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The 2.6 kernel, among other things, provides many enhancements to the kernel |
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build infrastructure, or "kbuild system." Among the features that have been |
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build infrastructure, or "kbuild system." Among the features that have been |
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added, the 2.6 kernel now allows all of the files created by the kernel to be |
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added, the 2.6 kernel now allows all of the files created by the kernel to be |
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output to a arbitrary seperate location. This has several advantages over the |
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output to a arbitrary separate location. This has several advantages over the |
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old method: |
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old method: |
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</p> |
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</p> |
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Lines 99-110
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</p> |
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</p> |
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<note> |
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<note> |
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Gentoo's <b>sandbox</b> is system that prevents portage from writing to the live |
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Gentoo's <b>sandbox</b> is a system that prevents portage from writing to the |
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filesystem until the final merge step of the package installation. |
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live filesystem until the final merge step of the package installation. |
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</note> |
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</note> |
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<p> |
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<p> |
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Several dependant steps can be taken to resolve this issue. In short, kernel |
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Several dependent steps can be taken to resolve this issue. In short, kernel |
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builds must output all of their files to a different location when they are |
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builds must output all of their files to a different location when they are |
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compiled, and later external module compiles must <b>also</b> do this, only they |
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compiled, and later external module compiles must <b>also</b> do this, only they |
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output to some subdirectory of the temporary build location. By letting the |
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output to some subdirectory of the temporary build location. By letting the |
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Lines 123-129
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<p> |
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<p> |
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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, <c>KBUILD_OUTPUT</c> and <c>O</c>. <c>KBUILD_OUTPUT</c> 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 overridden on the command line by specifying a |
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new <c>O</c> 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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Lines 188-197
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<body> |
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<body> |
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<p> |
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<p> |
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After configuring to use a different output directory, the changes go largly |
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After configuring to use a different output directory, the changes go largely |
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unnoticed when configuring and installing a kernel. There are a few key file |
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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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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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concerned 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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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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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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<path>/var/tmp/kernel-output/2.6.4</path>. |
