It s not an embedded Linux distribution It creates a custom one for you. David Stewart Intel Corporation April 11, 2011

Transcription

1 It s not an embedded Linux distribution It creates a custom one for you. The Yocto Project and its Application Development Toolkit (ADT) - The Answer to Effective Embedded Application Development David Stewart Intel Corporation April 11, 2011

2 Agenda Challenges Developing Today s Embedded Software The Yocto Project Build System The Yocto Project Application Development Toolkit (ADT) The ADT Usage Model Example App Development using ADT Benefits of Using the Yocto Project and its ADT Q&A 2/

3 Challenges Developing Today's Embedded Software The Context SoCs have brought fantastic capabilities to embedded products But... it means that rapidly developed application software is a key part of the solution Application developer is quite often a different role/skillset than the system developer Embedded products typically require a targeted application development effort - focused on rapid development for embedded devices Customized toolchain and development platform are essential for embedded software development 3/

4 Challenges Developing Today's Embedded Software Challenges: Support the app developer role with their own environment Quickly roll out new applications that utilize features in the silicon and meet time to market (TTM) demands is paramount Time and complexity to build up such a TTM accelerator 4/

5 The Yocto Project Build System Yocto Workflow 5/

6 Setting up the App Developer Environment System dev App dev Sysroot: (Bootable Linux filesystem with dev headers) Cross-toolchain Installation (eg: /opt/poky) Package Repository (networked or local) 6/

7 Sys Dev builds what the App Dev needs 1.Build the cross toolchain for a specific host system (e.g. x86_64) and target architecture (e.g arm): 1.Set SDKMACHINE=x86_64 in conf/local.conf 2.Run MACHINE=qemuarm bitbake meta-toolchain packageindex 2.Build the matching target rootfs (e.g. poky-image-sato-sdk) that sysroot is based on: Run MACHINE=qemuarm bitbake poky-image-sato-sdk packageindex (Sato is a gnome mobile environment and visual style that is designed specifically to work well with small high resolution screens and stylus input) For more simplicity, build them in a single step: Run With MACHINE=qemuarm Yocto, one configuration, bitbake one poky-image-sato-sdk command can generate metatoolchain package-index a toolchain and matching rootfs both image 7/

8 ADT Notes Cross toolchain and image files generated by the Yocto build system based on the target device metadata configuration Setup target system development environment on the App Dev machine based on sysroot concept GNU cross-development toolchain of build, packaging, and debug Development headers and libraries Sysroot represents target device root filesystem Optimized for autotools-type projects For autotool enabled packages just pass host options to configure, e.g. configure --host=arm-poky-linux-gnueabi --with-libtoolsysroot=/home/davest/arm For other projects, ensure that the cross tools are used, e.g. CC=arm-poky-linux-gnueabi-gcc and LD=arm-poky-linux-gnueabi-ld in makefile 8/

9 ADT Notes (cont.) Either Qemu with GL pass-through or real hardware as development targets User mode NFS support Allow emulator and host access the file system at same time Use package management infrastructure to update packages on running systems and sysroot: RPM, Deb, OPKG ADT installer script provides customization to set up cross development environment 9/

10 IDE Support: Eclipse Eclipse plug-in and user space tool suite offerings further improve developer productivity 10/

11 The Yocto Project and ADT Usage Model 11/

12 Example Application Development Using ADT A case study to show how to customize a cross development environment via the Yocto ADT Original cross development setup A x86_64-arm cross toolchain installed under /opt/poky/1.0 Sysroot extracted from poky-image-sato-sdk rootfs under /home/davest/arm Add support for clutter-based applications on the new device: Step 1. target metadata needs to be extended to add clutter library support, e.g. clutter-1.4_1.4.2.bb and clutter.inc Step 2. Run bitbake clutter-1.4 to build clutter library packages, using opkg 12/

13 Example Application Development Using ADT (cont.) Step 3. Use a package manager (e.g. opkg) to add clutter packages to sysroot: opkg-cl f ~davest/opkg/opkg.conf -o ~davest/arm update opkg-cl f ~davest/opkg/opkg.conf -o ~davest/arm --force-overwrite install libclutter-glx opkg-cl f ~davest/opkg/opkg.conf -o ~davest/arm --force-overwrite install libclutter-glx-1.4-dbg opkg-cl f ~davest/opkg/opkg.conf -o ~davest/arm --force-overwrite install libclutter-glx-1.4-dev Step 4. Build clutter autotool based application with configure with-libtool-sysroot=/home/davest/arm --host=arm-pokylinux-gnueabi make will use cross tools e.g. arm-poky-linux-gnueabi-gcc --sysroot=/home/davest/arm Step 5. Boot up qemu in the unfs mode to test, debug new clutter app on target emulator poky-qemu /home/davest/qemu-kernel/zimage-qemuarm.bin /home/davest/arm The shared and updated sysroot as rootfs allows immediate cross debug and run in the target emulator with no need to recreate a target image 13/

14 Example Application Development Using ADT (cont.) To finish up the device project: Create a recipe for your app and include it in the system build User specified sysroot supports multiple build profiles cross development environment setup for same target architecture e.g. Yocto provides, minimal, minimal-dev, lsb, lsb-dev, lsb-sdk, sato, sato-dev, sato-sdk Application development can progress in parallel with system development 14/

15 Benefits of Using the Yocto Project and its ADT Easily build an embedded product focused cross-toolchain Using sysroot, quickly setup a customized cross-development environment Same build configuration to build the target-specific distribution image and the cross-toolchain Enhanced developer productivity through ADT Eclipse plug-in, Qemu emulator and user-space tool suite offerings 15/

16 Benefits of Using the Yocto Project and its ADT (cont.) An embedded board vendor can provide a product-focused toolchain, tools and development platform in the bundle with Board Support Package (BSP)s. Enable immediate software development against the new product that best showcases its unique features Do software and hardware development in parallel, which leads to great TTM for both software and hardware readiness at product launch 16/

17 Questions? 17/

18 Backup 18/

19 The Yocto Project Tools The ADT Application user space tools suite contains the following essential tools that provide target analytical capabilities: PowerTop LatencyTop Oprofile Perf Lttng-ust SystemTap Yocto 1.0 will also provide the following tools: SystemProf Trace-cmd/kernelshark blktrace 19/

20 The Yocto Project ADT Standalone No IDE required - command line arguments Script files provided: Environment setup script for cross development environment Running Poky Qemu images Use package tools, user mode NFS to provision applications to target devices 20/

21 The Yocto Project ADT Eclipse Plug-in Built on top via extensions of the available feature rich Eclipse plug-ins CDT, Linux Tools Project, TCF/RSE Integrates Yocto ADT cross toolchain into CDT Via CDT to interact with tools to achieve cross platform build, deploy, test, debug Intended to be used for GNU autotools projects Leverage TCF and its remote agent mechanism to achieve remote tools interaction without leaving IDE 21/

22 Code extract of clutter-1.4_1.4.2.bb and clutter.inc Clutter-1.4_1.4.2.bb require clutter.inc PR = "r0" PACKAGES =+ "${PN}-examples" FILES_${PN}-examples = "${bindir}/test-* ${pkgdatadir}/redhand.png" SRC_URI = " \... Clutter.inc DESCRIPTION = "Clutter graphics library" HOMEPAGE = " LICENSE = "LGPL" COMPATIBLE_MACHINE = "(zylonite mx31litekit omap-3430ldp omap-3430sdp mx31ads qemuarm qemux86 ipodtouch atom-pc menlow)" STDDEPENDS = "virtual/libx11 gtk-doc-native pango glib-2.0 libxfixes gtk+ libxi" BASE_CONF = "--disable-gtk-doc ${@get_clutter_fpu_setting(bb, d)}" DEPENDS = "${STDDEPENDS} virtual/libgl gettext" EXTRA_OECONF = "${BASE_CONF} --with-flavour=glx" DEPENDS_zylonite = "${STDDEPENDS} libgles-zylonite tslib" EXTRA_OECONF_zylonite = "${BASE_CONF} --with-flavour=eglnative" PACKAGE_ARCH_zylonite = "${MACHINE_ARCH}" LDFLAGS_append_zylonite = " -lnws -lstdc++ " 22/

23 Resources 23/

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