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SPDX headers have been added to each file, and match the headers used in the DocBook files. (From yocto-docs rev: 79dbb0007ae24da4a3689a23e921f2a2638757f7) Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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2.5 KiB
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46 lines
2.5 KiB
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.. SPDX-License-Identifier: CC-BY-2.0-UK
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**********************
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Kernel Development FAQ
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**********************
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.. _kernel-dev-faq-section:
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Common Questions and Solutions
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==============================
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The following lists some solutions for common questions. How do I use my
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own Linux kernel ``.config`` file? Refer to the "`Changing the
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Configuration <#changing-the-configuration>`__" section for information.
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How do I create configuration fragments? Refer to the "`Creating
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Configuration Fragments <#creating-config-fragments>`__" section for
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information. How do I use my own Linux kernel sources? Refer to the
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"`Working With Your Own Sources <#working-with-your-own-sources>`__"
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section for information. How do I install/not-install the kernel image
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on the rootfs? The kernel image (e.g. ``vmlinuz``) is provided by the
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``kernel-image`` package. Image recipes depend on ``kernel-base``. To
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specify whether or not the kernel image is installed in the generated
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root filesystem, override ``RDEPENDS_kernel-base`` to include or not
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include "kernel-image". See the "`Using .bbappend Files in Your
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Layer <&YOCTO_DOCS_DEV_URL;#using-bbappend-files>`__" section in the
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Yocto Project Development Tasks Manual for information on how to use an
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append file to override metadata. How do I install a specific kernel
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module? Linux kernel modules are packaged individually. To ensure a
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specific kernel module is included in an image, include it in the
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appropriate machine
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```RRECOMMENDS`` <&YOCTO_DOCS_REF_URL;#var-RRECOMMENDS>`__ variable.
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These other variables are useful for installing specific modules:
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```MACHINE_ESSENTIAL_EXTRA_RDEPENDS`` <&YOCTO_DOCS_REF_URL;#var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS>`__
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```MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS`` <&YOCTO_DOCS_REF_URL;#var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS>`__
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```MACHINE_EXTRA_RDEPENDS`` <&YOCTO_DOCS_REF_URL;#var-MACHINE_EXTRA_RDEPENDS>`__
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```MACHINE_EXTRA_RRECOMMENDS`` <&YOCTO_DOCS_REF_URL;#var-MACHINE_EXTRA_RRECOMMENDS>`__
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For example, set the following in the ``qemux86.conf`` file to include
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the ``ab123`` kernel modules with images built for the ``qemux86``
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machine: MACHINE_EXTRA_RRECOMMENDS += "kernel-module-ab123" For more
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information, see the "`Incorporating Out-of-Tree
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Modules <#incorporating-out-of-tree-modules>`__" section. How do I
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change the Linux kernel command line? The Linux kernel command line is
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typically specified in the machine config using the ``APPEND`` variable.
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For example, you can add some helpful debug information doing the
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following: APPEND += "printk.time=y initcall_debug debug"
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