%poky; ] > Welcome to the Application Development Toolkit User’s Guide. This manual provides information that lets you get going with the ADT to develop projects using the Yocto Project.

Fundamentally, the ADT consists of an architecture-specific cross-toolchain and a matching sysroot that are both built by the Yocto Project build system Poky. The toolchain and sysroot are based on a metadata configuration and extensions, which allows you to cross-develop on the host machine for the target. Additionally, to provide an effective development platform, the Yocto Project makes available and suggests other tools you can use with the ADT. These other tools include the Eclipse IDE Yocto Plug-in, an emulator (QEMU), and various user-space tools that greatly enhance your development experience. The resulting combination of the architecture-specific cross-toolchain and sysroot along with these additional tools yields a custom-built, cross-development platform for a user-targeted product.

This section provides a brief description of what comprises the ADT.

The cross-toolchain consists of a cross-compiler, cross-linker, and cross-debugger that are used to develop user-space applications for targeted hardware. This toolchain is created either by running the ADT Installer script or through a Yocto Project build tree that is based on your metadata configuration or extension for your targeted device. The cross-toolchain works with a matching target sysroot.

The matching target sysroot contains needed headers and libraries for generating binaries that run on the target architecture. The sysroot is based on the target root filesystem image that is built by the Yocto Project's build system Poky and uses the same metadata configuration used to build the cross-toolchain.

The QEMU emulator allows you to simulate your hardware while running your application or image. QEMU is made available a number of ways: If you use the ADT Installer script to install ADT, you can specify whether or not to install QEMU. If you have downloaded a Yocto Project release and unpacked it to create a Yocto Project file structure and you have sourced the Yocto Project environment setup script, QEMU is installed and automatically available. If you have installed the cross-toolchain tarball and you have sourcing the toolchain's setup environment script, QEMU is also installed and automatically available.

User-space tools are included as part of the distribution. You will find these tools helpful during development. The tools include LatencyTOP, PowerTOP, OProfile, Perf, SystemTap, and Lttng-ust. These tools are common development tools for the Linux platform. LatencyTOP: LatencyTOP focuses on latency that causes skips in audio, stutters in your desktop experience, or situations that overload your server even when you have plenty of CPU power left. You can find out more about LatencyTOP at . PowerTOP: Helps you determine what software is using the most power. You can find out more about PowerTOP at . OProfile: A system-wide profiler for Linux systems that is capable of profiling all running code at low overhead. You can find out more about OProfile at . Perf: Performance counters for Linux used to keep track of certain types of hardware and software events. For more information on these types of counters see and click on “Perf tools.” SystemTap: A free software infrastructure that simplifies information gathering about a running Linux system. This information helps you diagnose performance or functional problems. SystemTap is not available as a user-space tool through the Yocto Eclipse IDE Plug-in. See for more information on SystemTap. Lttng-ust: A User-space Tracer designed to provide detailed information on user-space activity. See for more information on Lttng-ust.