DENX ELDK与U-Boot开发指南

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"Eldk + UBoot 是一个关于DENX公司开发的嵌入式Linux开发工具包（ELDK）和U-Boot引导加载程序的文档。这份文档主要面向使用Canyonlands版本的用户，内容包括ELDK的介绍、版权信息、免责声明、可用性、贡献者、翻译版本、反馈方式以及约定的使用规范。此外，它详细阐述了ELDK的获取、安装、使用、通过NFS挂载目标组件、重建ELDK组件的步骤，以及如何从零开始重新构建整个ELDK环境。" 在嵌入式系统领域，ELDK（Embedded Linux Development Kit）是一个重要的工具，它提供了一个完整的环境来开发和测试针对各种嵌入式处理器的Linux系统。这个工具包包含了编译工具链、库、头文件以及必要的支持工具，使得开发者能够在主机系统上构建和调试针对目标架构的Linux系统。 U-Boot是一个广泛应用的开源嵌入式设备引导加载程序，它能够帮助设备在启动过程中执行基本的初始化任务，加载操作系统内核，并将控制权交给内核。U-Boot支持多种处理器架构和板级配置，是许多嵌入式和物联网设备的标准选择。文档中的关键部分包括： 1. ELDK Availability：这部分讲述了ELDK在何处可以获取，以及它的适用范围。 2. Installation：详细介绍了ELDK的安装过程，包括产品包装、下载、初次安装、单个包的安装与卸载以及整个安装的移除。 3. Working with ELDK：这部分指导用户如何在多个安装之间切换，以及如何通过NFS挂载目标组件来实现开发和调试。 4. Rebuilding ELDK Components：涵盖了如何重建ELDK的源分布、目标包和ELDTP包，这对于定制化系统或者修复bug是至关重要的。 5. ELDK Packages：列出了ELDTP包和目标包的清单，方便开发者了解ELDK包含的所有组件。 6. Rebuilding the ELDK from Scratch：这部分详细说明了如何从源代码开始完全重建ELDK，包括建立构建环境、使用build.sh脚本以及理解cpkgs.l文件格式。通过这份文档，开发者可以获得全面的ELDK和U-Boot的知识，从而有效地进行嵌入式Linux系统的开发和维护。无论是初学者还是经验丰富的专业人士，都能从中获益，提升其在嵌入式领域的专业技能。

-d <dir> Specifies the root directory of the ELDK being installed. If omitted, then the current

directory is assumed.

-a <cpu_family> Specifies the target CPU family directory. If omitted, all installed target architecture

directories will be populated with the device nodes.

-h Prints usage.

# /mnt/cdrom/ELDK_MAKEDEV -d /opt/eldk

NOTE: Compared to older versions of the ELDK, options and behaviour of this command have been changed

significantly. Please read the documentation.

Some of the target utilities included in the ELDK, such as mount and su, have the SUID bit set. This

means that when run, they will have privileges of the file owner of these utilities. That is, normally, they will

have the privileges of the user who installed the ELDK on the host system. However, for these utilities to

work properly, they must have superuser privileges. This means that if the ELDK was not installed by the

superuser, the file owner of the target ELDK utilities that have the SUID bit set must be changed to root

before a target component may be mounted as the root file system. The ELDK distribution image contains an

ELDK_FIXOWNER script, which you can use to change file owners of all the appropriate files of the ELDK

installation to root. The script accepts the same arguments as the ELDK_MAKEDEV script above. Please note

that you must have superuser privileges to run this script. For instance, if you have installed the ELDK in the

/opt/eldk directory, you can use the following commands:

# cd /opt/eldk

# /mnt/cdrom/ELDK_FIXOWNER

Please note, that in the case that the installation directory, where the new ELDK distribution is being installed,

is already populated with other ELDK distributions, the execution of the ELDK_FIXOWNER script without

arguments will make the script work with all installed ELDK target architecture directories. This could take

some time. To save the time, please use the -a argument to specify the appropriate target architecture. For

instance:

# cd /opt/eldk

# /mnt/cdrom/ELDK_FIXOWNER -a ppc_8xx

3.8. Rebuilding ELDK Components

3.8.1. ELDK Source Distribution

The ELDK is distributed with the full sources of all the components, so you may rebuild any ELDK package.

The sources are provided in the form of SRPM packages, distributed as a separate ISO image.

To rebuild a target or ELDT package, you must first install the appropriate source RPM package from the ISO

image into the ELDK environment. This can be done using the following command:

$ ${CROSS_COMPILE}rpm -i /mnt/cdrom/SRPMS/<source_rpm_file_name>.src.rpm

After an ELDK source RPM is installed using the above command, its spec file and sources can be found in

the subdirectories of the <ELDK_root>/usr/src/denx subdirectory.

The sections that follow provide detailed instructions on rebuilding ELDT and target components of the

ELDK.

3.8. Rebuilding ELDK Components 16

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