From 9f915d46be73769c4b02f38fee14761b1b43958d Mon Sep 17 00:00:00 2001 From: Scott Rifenbark Date: Thu, 14 Jun 2012 11:46:49 -0700 Subject: documentation/dev-manual/dev-manual-start.xml: 1.1.2 variables and updates First pass at implementing the poky.ent variables. Also changes text where appropriate. (From yocto-docs rev: a9f31065ee0261d82fcac1f3db3ad98587418c15) Signed-off-by: Scott Rifenbark Signed-off-by: Richard Purdie --- documentation/dev-manual/dev-manual-start.xml | 156 +++++++++++++++++--------- 1 file changed, 101 insertions(+), 55 deletions(-) diff --git a/documentation/dev-manual/dev-manual-start.xml b/documentation/dev-manual/dev-manual-start.xml index d9f042bc61..d7a046b5c0 100644 --- a/documentation/dev-manual/dev-manual-start.xml +++ b/documentation/dev-manual/dev-manual-start.xml @@ -1,5 +1,6 @@ +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" +[ %poky; ] > @@ -9,7 +10,7 @@ This chapter introduces the Yocto Project and gives you an idea of what you need to get started. You can find enough information to set up your development host and build or use images for hardware supported by the Yocto Project by reading - + The Yocto Project Quick Start. @@ -30,20 +31,21 @@ - You can use the Yocto Project, which uses the BitBake build tool, to develop complete Linux + You can use the Yocto Project build system, which uses + BitBake, to develop complete Linux images and associated user-space applications for architectures based on ARM, MIPS, PowerPC, x86 and x86-64. While the Yocto Project does not provide a strict testing framework, it does provide or generate for you artifacts that let you perform target-level and emulated testing and debugging. - And, if you are an Eclipse + Additionally, if you are an Eclipse IDE user, you can install an Eclipse Yocto Plug-in to allow you to develop within that familiar environment.
- Getting Setup + Getting Set Up Here is what you need to get set up to use the Yocto Project: @@ -57,7 +59,7 @@ Packages: The Yocto Project requires certain packages exist on your development system (e.g. Python 2.6 or 2.7). - See "The Packages" + See "The Packages" section in the Yocto Project Quick start for the exact package requirements and the installation commands to install them for the supported distributions. @@ -73,29 +75,37 @@ Tarball Extraction: If you are not going to contribute back into the Yocto Project, you can simply download the Yocto Project release you want - from the website’s download page. + from the website’s download page. Once you have the tarball, just extract it into a directory of your choice. - For example, the following command extracts the Yocto Project 1.1.1 release tarball + For example, the following command extracts the Yocto Project &DISTRO; + release tarball into the current working directory and sets up the Yocto Project file structure - with a top-level directory named poky-edison-6.0.1: + with a top-level directory named &YOCTO_POKY;: - $ tar xfj poky-edison-6.0.1.tar.bz2 + $ tar xfj &YOCTO_POKY_TARBALL; This method does not produce a Git repository. Instead, you simply end up with a local snapshot of the Yocto Project files that are based on the particular release in the tarball. Git Repository Method: If you are going to be contributing - back into the Yocto Project, you should use Git commands to set up a local - Git repository of the Yocto Project files. + back into the Yocto Project or you simply want to keep up + with the latest developments, you should use Git commands to set up a local + Git repository of the Yocto Project files. Doing so creates a Git repository with a complete history of changes and allows - you to easily submit your changes upstream to the project. - The following transcript shows how to clone the Yocto Project files' - Git repository into the current working directory. - The command creates the repository in a directory named poky. - For information on the Yocto Project and Git, see the - "Git" section. - + you to easily submit your changes upstream to the project. + Because you cloned the repository, you have access to all the Yocto Project development + branches and tag names used in the upstream repository. + The following transcript shows how to clone the Yocto Project Files' + Git repository into the current working directory. + The name of the Yocto Project Files Git repository in the Yocto Project Files + Source Repositories is poky. + You can view the Yocto Project Source Repositories at + + The command creates the local repository in a directory named poky. + For information on Git used within the Yocto Project, see the + "Git" section. + $ git clone git://git.yoctoproject.org/poky Initialized empty Git repository in /home/scottrif/poky/.git/ remote: Counting objects: 116882, done. @@ -104,15 +114,18 @@ Receiving objects: 100% (116882/116882), 72.13 MiB | 2.68 MiB/s, done. Resolving deltas: 100% (80651/80651), done. For another example of how to set up your own local Git repositories, see this - + wiki page, which describes how to create both poky and meta-intel Git repositories. Linux Yocto Kernel: If you are going to be making modifications to a supported Linux Yocto kernel, you need to establish local copies of the source. - This setup involves creating a bare clone of the Linux Yocto kernel and then cloning - that repository. + You can find Git repositories of supported Linux Yocto Kernels organized under + "Yocto Linux Kernel" in the Yocto Project Source Repositories at + . + This setup involves creating a bare clone of the Linux Yocto kernel and then + copying that cloned repository. You can create the bare clone and the copy of the bare clone anywhere you like. For simplicity, it is recommended that you create these structures outside of the Yocto Project files' Git repository. @@ -122,8 +135,8 @@ When you have a local Linux Yocto kernel Git repository, you can reference that repository rather than the upstream Git repository as part of the clone command. - Doing so can speed up the process. - In the following example, the bare clone is named + Doing so can speed up the process. + In the following example, the bare clone is named linux-yocto-3.0-1.1.x.git, while the copy is named my-linux-yocto-3.0-1.1.x-work: @@ -143,20 +156,23 @@ The poky-extras Git Repository: - The poky-extras Git repository contains metadata needed to - build the kernel image. - In particular, it contains the kernel .bbappend files that you + The poky-extras Git repository contains metadata needed + only if you are modifying and building the kernel image. + In particular, it contains the kernel BitBake append (.bbappend) + files that you edit to point to your locally modified kernel source files and to build the kernel image. Pointing to these local files is much more efficient than requiring a download of the source files from upstream each time you make changes to the kernel. - It is good practice to create this Git repository inside the Yocto Project - files Git repository. - Following is an example that creates the poky-extras Git + You can find the poky-extras Git Repository in the + "Yocto Metadata Layers" area of the Yocto Project Source Repositories at + . + It is good practice to create this Git repository inside the Yocto Project + files Git repository. + Following is an example that creates the poky-extras Git repository inside the Yocto Project files Git repository, which is named poky in this case: - $ cd ~/poky $ git clone git://git.yoctoproject.org/poky-extras poky-extras Initialized empty Git repository in /home/scottrif/poky/poky-extras/.git/ remote: Counting objects: 561, done. @@ -169,6 +185,7 @@ Similar considerations exist for BSPs. You can get set up for BSP development one of two ways: tarball extraction or with a local Git repository. + It is a good idea to use the same method used to set up the Yocto Project Files. Regardless of the method you use, the Yocto Project uses the following BSP layer naming scheme: @@ -184,21 +201,23 @@ Tarball Extraction: You can download any released BSP tarball from the same - download site used + download site used to get the Yocto Project release. Once you have the tarball, just extract it into a directory of your choice. Again, this method just produces a snapshot of the BSP layer in the form of a hierarchical directory structure. Git Repository Method: If you are working - with a Yocto Project files Git repository, you should also set up a - meta-intel Git repository. - Typically, you set up the meta-intel Git repository inside - the Yocto Project files Git repository. - For example, the following transcript shows the steps to clone the + with a Yocto Project Files Git repository, you should also use this method + to set up the meta-intel Git repository. + You can locate the meta-intel Git repository in the + "Yocto Metadata Layers" area of the Yocto Project Source Repositories at + . + Typically, you set up the meta-intel Git repository inside + the Yocto Project Files Git repository. + For example, the following transcript shows the steps to clone the meta-intel Git repository inside the poky Git repository. - $cd poky $ git clone git://git.yoctoproject.org/meta-intel.git Initialized empty Git repository in /home/scottrif/poky/meta-intel/.git/ remote: Counting objects: 3279, done. @@ -208,7 +227,7 @@ Resolving deltas: 100% (1761/1761), done. The same - + wiki page referenced earlier covers how to set up the meta-intel Git repository. @@ -216,7 +235,7 @@ applications using the Eclipse Integrated Development Environment (IDE), you will need this plug-in. See the - "Setting up the Eclipse IDE" + "Setting up the Eclipse IDE" section in the Yocto Application Development Toolkit (ADT) User’s Guide for more information. @@ -229,7 +248,7 @@ The build process creates an entire Linux distribution, including the toolchain, from source. For more information on this topic, see the - "Building an Image" + "Building an Image" section in the Yocto Project Quick Start. @@ -240,12 +259,20 @@ previous section. Initialize the build environment by sourcing a build environment script. - Optionally ensure the conf/local.conf configuration file is set - up how you want it. - This file defines the target machine architecture and other build options. - Build the image using the BitBake command. - If you want information on Bitbake, see the user manual at - . + Optionally ensure the /conf/local.conf configuration file, + which is found in the Yocto Project build directory, + is set up how you want it. + This file defines many aspects of the build environment including + the target machine architecture through the + MACHINE variable, + the development machine's processor use through the + BB_NUMBER_THREADS and + PARALLEL_MAKE variables, and + a centralized tarball download directory through the + DL_DIR variable. + Build the image using the bitbake command. + If you want information on BitBake, see the user manual at + . Run the image either on the actual hardware or using the QEMU emulator. @@ -256,18 +283,37 @@ Using Pre-Built Binaries and QEMU - Another option you have to get started is to use pre-built binaries. - This scenario is ideal for developing software applications to run on your target hardware. - To do this, you need to install the stand-alone Yocto Project cross-toolchain tarball and - then download the pre-built kernel that you will boot in the QEMU emulator. - Next, you must download and extract the target root filesystem for your target - machine’s architecture. - Finally, you set up the environment to emulate the hardware and then start the QEMU emulator. + Another option you have to get started is to use pre-built binaries. + The Yocto Project provides many types of binaries with each release. + See the Reference: Images + section for descriptions of the types of binaries that ship with a Yocto Project + release. + + + + Using a pre-built binary is ideal for developing software applications to run on your + target hardware. + To do this, you need to be able to access the appropriate cross-toolchain tarball for + the architecture on which you are developing. + If you are using an SDK type image, the image ships with the complete toolchain native to + the architecture. + If you are not using an SDK type image, you need to separately download and + install the stand-alone Yocto Project cross-toolchain tarball. + Regardless of the type of image you are using, you need to download the pre-built kernel + that you will boot in the QEMU emulator and then download and extract the target root + filesystem for your target machine’s architecture. + You can get architecture-specific binaries and filesystem from + machines. + You can get stand-alone toolchains from + toolchains. + Once you have all your files, you set up the environment to emulate the hardware + by sourcing an environment setup script. + Finally, you start the QEMU emulator. You can find details on all these steps in the - "Using Pre-Built Binaries and QEMU" + "Using Pre-Built Binaries and QEMU" section of the Yocto Project Quick Start.
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