使用Yocto Project构建Freescale i.MX板子镜像指南

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"Freescale_Yocto_Project_Users_Guide.pdf" 这篇文档是Freescale官方关于Yocto Project的用户指南，专门针对嵌入式Linux开发。Yocto Project是一个开源合作项目，致力于简化和标准化嵌入式设备上的Linux系统构建。如需了解更多关于Yocto Project的信息，可以访问其官方网站：www.yoctoproject.org。 Freescale的Yocto Project社区BSP（板级支持包）是一个独立于Freescale的开发社区，它为基于Yocto Project环境的i.MX系列主板提供支持。Freescale的i.MX平台加入了Yocto Project社区，并提供了基于Yocto Project框架的发行版。本指南详细阐述了如何利用Yocto Project的构建环境为Freescale i.MX系列主板构建镜像。在这一发行版中，Freescale提供了一个名为meta-fsl-bsp-release的附加层，其目的是为了将新的Freescale发布版与Freescale Yocto Project社区BSP集成。所有的参考信息都指向Yocto Project中的其他层，除了meta-fsl-bsp-release。meta-fsl-bsp-release层的目标是发布更新和新的Yocto Project食谱（recipes，即构建规则）以及机器配置，以支持新版本，这些在现有的meta-fsl-arm和meta-fsl-demos层中尚未提供的新版本。这个指南将指导用户如何处理meta-fsl-bsp-release层，以便在Yocto Project环境中构建适合Freescale i.MX平台的稳定发行版。这包括了如何配置和定制系统镜像，添加特定的硬件驱动，以及优化性能以适应各种i.MX系列的硬件特性。此外，它还可能涉及如何使用BitBake构建工具，理解Yocto Project的元数据结构，以及如何调试和解决构建过程中遇到的问题。通过遵循此用户指南，开发者能够有效地利用Yocto Project的强大功能，快速创建和维护适用于Freescale i.MX系列主板的嵌入式Linux系统，同时保持与Yocto Project社区的同步，获取最新的软件更新和技术支持。这对于那些希望在i.MX平台上进行嵌入式开发的专业人士来说，是一份非常宝贵的参考资料。

• L3.10.17_1.0.0-ga is a Linux kernel that Freescale has released only for the Yocto Project. Previous BSP releases

based on Linux version 3.0.35 are released with ltib.

• Freescale L3.10.17_1.0.0-ga supports a device tree. This change adds the device tree settings in the i.MX 6

machine configuration files.

• U-Boot recipe

• The U-Boot recipe resides in the recipes-bsp folder and integrates a Freescale uboot-imx.git from the source

downloaded from the Freecale git server.

• Certain i.MX boards use different U-Boot versions.

• Freescale release L3.10.17_1.0.0-ga for the i.MX 6 devices uses an updated v2013.04 Freescale version. This

version has not been updated for other i.MX Freescale hardware.

• Releases based on Linux version 2.6.35 for imx5qsb uses v2009.08 from meta-fsl-arm.

• The Freescale Yocto Project Community BSP uses u-boot-fslc v2013.10 from the mainline but this is only

supported by the community 3.0.35 kernel and will not work for the 3.10.17 kernel.

• Freescale release L3.10.17_1.0.0-ga requires using the Freescale v2013-04 U-Boot release.

• The Freescale Yocto Project Community BSP updates U-Boot versions frequently, so the information above

might change as new U-Boot versions are integrated to meta-fsl-arm layers and updates from Freescale u-boot-

imx releases are integrated into the mainline.

• Graphics recipes

• Graphics recipes reside in recipes-graphics.

• Graphics recipes integrate the Freescale graphics package release. For the i.MX 6 boards, the gpu-viv-bin-mx6q

recipes package the graphic components for each backend – X11, frame buffer (fb), Direct Frame Buffer

(directfb), Wayland backend and Weston compositor (weston).

• Xorg-driver integrates our xserver-xorg.

• For i.MX 5, the amd-gpu-bin provides packages for X11 and frame buffer backends.

• i.MX package recipes

imx-lib, imx-test, and firmware-imx reside in recipes-bsp and pull from the Freescale mirror to build and package into

image recipes.

• Multimedia recipes

• Multimedia recipes reside in recipes-multimedia.

• Recipes include libfslcodec, libfslparser, libvpuwrap, and gstreamer that pull from the Freescale mirror to build

and package into image recipes.

• Some recipes are provided for restricted codecs for which packages are not on the Freescale mirror. These

packages are available separately.

• Core recipes

Some recipes for rules, such as udev, provide updated i.MX rules to be deployed in the system. These recipes are

usually updates of policy recipes and are used for customization only. Releases only provide updates if needed.

• Demo recipes

Demonstration recipes reside in the meta-fsl-demos directory. This layer contains image recipes and recipes for

customization, such as touch calibration, or recipes for demonstration applications, such as glcubes-demo on imx53qsb.

3 Host Setup

To get the Yocto Project expected behavior in a Linux Host Machine, the packages and utilities described below must be

installed. An important consideration is the hard disk space required in the host machine. For example, when building on a

machine running Ubuntu, the minimum hard disk space required is about 50 GB for the X11 backend. It is recommended that

at least 120 GB be provided, which is enough to compile any backend.

Host Setup

Freescale Yocto Project User's Guide, Rev L3.10.17_1.0.0-ga, 05/2014

Freescale Semiconductor, Inc. 3

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