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2eb5550db4
To prepare to add another example bbappend, rename the current "Using .bbappend Files in Your Layer" section to "Appending Other Layers Metadata With Your Layer". Name the current example as "Overlaying a File Using Your Layer". (From yocto-docs rev: 62d7b5721b2fbcf1e22fc4e7bbac51d52260730e) Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com> Reviewed-by: Quentin Schulz <foss@0leil.net> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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2.5 KiB
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77 lines
2.5 KiB
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.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
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**********************
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Kernel Development FAQ
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**********************
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Common Questions and Solutions
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==============================
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Here are some solutions for common questions.
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How do I use my own Linux kernel ``.config`` file?
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--------------------------------------------------
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Refer to the
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":ref:`kernel-dev/common:changing the configuration`"
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section for information.
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How do I create configuration fragments?
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----------------------------------------
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A: Refer to the
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":ref:`kernel-dev/common:creating configuration fragments`"
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section for information.
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How do I use my own Linux kernel sources?
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-----------------------------------------
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Refer to the
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":ref:`kernel-dev/common:working with your own sources`"
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section for information.
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How do I install/not-install the kernel image on the rootfs?
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------------------------------------------------------------
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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_PACKAGE_NAME}-base`` to include or not
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include "kernel-image". See the
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":ref:`dev-manual/common-tasks:appending other layers metadata with your layer`"
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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.
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How do I install a specific kernel module?
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------------------------------------------
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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 :term:`RRECOMMENDS` variable.
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These other variables are useful for installing specific modules:
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- :term:`MACHINE_ESSENTIAL_EXTRA_RDEPENDS`
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- :term:`MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS`
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- :term:`MACHINE_EXTRA_RDEPENDS`
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- :term:`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::
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MACHINE_EXTRA_RRECOMMENDS += "kernel-module-ab123"
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For more information, see the
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":ref:`kernel-dev/common:incorporating out-of-tree modules`" section.
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How do I change the Linux kernel command line?
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----------------------------------------------
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The Linux kernel command line is
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typically specified in the machine config using the :term:`APPEND` variable.
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For example, you can add some helpful debug information doing the
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following::
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APPEND += "printk.time=y initcall_debug debug"
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