From c527fd1f14c27855a37f2e8ac5346ce8d940ced2 Mon Sep 17 00:00:00 2001 From: Tudor Florea Date: Thu, 16 Oct 2014 03:05:19 +0200 Subject: initial commit for Enea Linux 4.0-140929 Migrated from the internal git server on the daisy-enea-point-release branch Signed-off-by: Tudor Florea --- documentation/kernel-dev/kernel-dev-intro.xml | 147 ++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 documentation/kernel-dev/kernel-dev-intro.xml (limited to 'documentation/kernel-dev/kernel-dev-intro.xml') diff --git a/documentation/kernel-dev/kernel-dev-intro.xml b/documentation/kernel-dev/kernel-dev-intro.xml new file mode 100644 index 0000000000..297696c965 --- /dev/null +++ b/documentation/kernel-dev/kernel-dev-intro.xml @@ -0,0 +1,147 @@ + %poky; ] > + + +Introduction + + + +
+ Overview + + + Regardless of how you intend to make use of the Yocto Project, + chances are you will work with the Linux kernel. + This manual provides background information on the Yocto Linux kernel + Metadata, + describes common tasks you can perform using the kernel tools, + and shows you how to use the kernel Metadata needed to work with + the kernel inside the Yocto Project. + + + + Each Yocto Project release has a set of linux-yocto recipes, whose + Git repositories you can view in the Yocto + Source Repositories under + the "Yocto Linux Kernel" heading. + New recipes for the release track the latest upstream developments + and introduce newly supported platforms. + Previous recipes in the release are refreshed and supported for at + least one additional release. + As they align, these previous releases are updated to include the + latest from the Long Term Support Initiative (LTSI) project. + Also included is a linux-yocto development recipe + (linux-yocto-dev.bb) should you want to work + with the very latest in upstream Linux kernel development and + kernel Metadata development. + + + + The Yocto Project also provides a powerful set of kernel + tools for managing Linux kernel sources and configuration data. + You can use these tools to make a single configuration change, + apply multiple patches, or work with your own kernel sources. + + + + In particular, the kernel tools allow you to generate configuration + fragments that specify only what you must, and nothing more. + Configuration fragments only need to contain the highest level + visible CONFIG options as presented by the Linux + kernel menuconfig system. + Contrast this against a complete Linux kernel + .config, which includes all the automatically + selected CONFIG options. + This efficiency reduces your maintenance effort and allows you + to further separate your configuration in ways that make sense for + your project. + A common split separates policy and hardware. + For example, all your kernels might support + the proc and sys filesystems, + but only specific boards require sound, USB, or specific drivers. + Specifying these configurations individually allows you to aggregate + them together as needed, but maintains them in only one place. + Similar logic applies to separating source changes. + + + + If you do not maintain your own kernel sources and need to make + only minimal changes to the sources, the released recipes provide a + vetted base upon which to layer your changes. + Doing so allows you to benefit from the continual kernel + integration and testing performed during development of the + Yocto Project. + + + + If, instead, you have a very specific Linux kernel source tree + and are unable to align with one of the official linux-yocto + recipes, an alternative exists by which you can use the Yocto + Project Linux kernel tools with your own kernel sources. + +
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+ Other Resources + + + The sections that follow provide instructions for completing + specific Linux kernel development tasks. + These instructions assume you are comfortable working with + BitBake + recipes and basic open-source development tools. + Understanding these concepts will facilitate the process of working + with the kernel recipes. + If you find you need some additional background, please be sure to + review and understand the following documentation: + + Yocto Project Quick Start + + The "Modifying Temporary Source Code" + section in the Yocto Project Development Manual + + The "Understanding and Creating Layers" section + in the Yocto Project Development Manual + The "Modifying the Kernel" section + in the Yocto Project Development Manual. + + + + + Finally, while this document focuses on the manual creation of + recipes, patches, and configuration files, the Yocto Project + Board Support Package (BSP) tools are available to automate + this process with existing content and work well to create the + initial framework and boilerplate code. + For details on these tools, see the + "Using the Yocto Project's BSP Tools" + section in the Yocto Project Board Support Package (BSP) Developer's + Guide. + +
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