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Integrate buildroot into devlib in order to ease building kernel and root filesystem images via 'generate-kernel-initrd.sh' helper script. As its name suggests, the script builds kernel image which also includes an initial RAM disk per default config files located under configs/<arch>/. Provide config files for buildroot and Linux kernel as well as a post-build.sh script which tweaks (e.g., allowing root login on SSH) target's root filesystem. doc/tools.rst talks about details of kernel and rootfs configuration. Signed-off-by: Metin Kaya <metin.kaya@arm.com>
86 lines
2.9 KiB
ReStructuredText
86 lines
2.9 KiB
ReStructuredText
Tools
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=====
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Android
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-------
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``tools/android/install_base.sh`` script installs Android command line tools
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for Linux and creates Android Virtual Devices (AVD).
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The script creates ``android-sdk-linux`` directory under ``tools/android`` and
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sets it as ``ANDROID_HOME`` directory (see
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https://developer.android.com/tools/variables).
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Your ``ANDROID_USER_HOME`` and ``ANDROID_EMULATOR_HOME`` environment variables
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point to ``tools/android/android-sdk-linux/.android``. Hence, removing
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``android-sdk-linux`` folder will clean all artefacts of ``install_base.sh``.
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It fetches Android command line tools, then installs Android SDK
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Platform-Tools, SDK Platform 31 (for Android 12) & 34 (for Android 14), and
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Google APIs for platforms 31 & 34 for the associated ABI type.
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Finally the script creates AVDs per Pixel 6 for Android 12 & 14.
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Shell commands below illustrate how to list available AVDs and run them via
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Android emulator:
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.. code:: shell
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ANDROID_HOME="/devlib/tools/android/android-sdk-linux"
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export ANDROID_HOME
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EMULATOR="${ANDROID_HOME}/emulator/emulator"
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export ANDROID_EMULATOR_HOME="${ANDROID_HOME}/.android"
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# List available AVDs:
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${EMULATOR} -list-avds
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# Run devlib-p6-14 AVD in emulator:
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${EMULATOR} -avd devlib-p6-14 -no-window -no-snapshot -memory 2048 &
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# After ~30 seconds, the emulated device will be ready:
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adb -s emulator-5554 shell "lsmod"
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Building buildroot
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------------------
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``buildroot/generate-kernel-initrd.sh`` helper script downloads and builds
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``buildroot`` per config files located under ``tools/buildroot/configs``
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for the specified architecture.
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The script roughly checks out ``2023.11.1`` tag of ``buildroot``, copies config
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files for buildroot (e.g., ``configs/aarch64/arm-power_aarch64_defconfig``) and
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kernel (e.g., ``configs/aarch64/linux.config``) to necessary places under
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buildroot directory, and runs ``make arm-power_aarch64_defconfig && make``
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commands.
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As its name suggests, ``generate-kernel-initrd.sh`` builds kernel image with an
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initial RAM disk per default config files.
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There is also ``post-build.sh`` script in order to make following tunings on
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root filesystem generated by ``buildroot``:
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- allow root login on SSH.
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- increase number of concurrent SSH connections/channels to let devlib
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consumers hammering the target system.
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In order to keep rootfs minimal, only OpenSSH and util-linux packages
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are enabled in the default configuration files.
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DHCP client and SSH server services are enabled on target system startup.
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SCHED_MC, SCHED_SMT and UCLAMP_TASK scheduler features are enabled for aarch64
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kernel.
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If you need to make changes on ``buildroot``, rootfs or kernel of target
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system, you may want to run commands similar to these:
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.. code:: shell
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$ cd tools/buildroot/buildroot-v2023.11.1-aarch64
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$ make menuconfig # or 'make linux-menuconfig' if you want to configure kernel
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$ make
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See https://buildroot.org/downloads/manual/manual.html for details.
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