Brillo / Weave Internals
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This document discusses Brillo and Weave, Google's platform for IoT based on Android. It provides a brief history of embedded Linux, Android, and headless Android. It describes Brillo's architecture based on embedded Linux, Android, Binder, and system services. It outlines Brillo's source code layout and differences from Android. It also summarizes Brillo images, user space components, services/daemons like Weave, and provides an example use case. In closing, it notes Brillo may become a new standard for embedded Linux and represents a work in progress with a clear cloud component.
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Brillo / Weave Internals
- 1. 1 Brillo / Weave Internals Embedded Linux Conference Europe 2016 Karim Yaghmour @karimyaghmour karim.yaghmour@opersys.com
- 2. 2 These slides are made available to you under a Creative Commons Share- Alike 3.0 license. The full terms of this license are here: https://creativecommons.org/licenses/by-sa/3.0/ Attribution requirements and misc., PLEASE READ: ● This slide must remain as-is in this specific location (slide #2), everything else you are free to change; including the logo :-) ● Use of figures in other documents must feature the below “Originals at” URL immediately under that figure and the below copyright notice where appropriate. ● You are free to fill in the “Delivered and/or customized by” space on the right as you see fit. ● You are FORBIDEN from using the default “About” slide as-is or any of its contents. ● You are FORBIDEN from using any content provided by 3rd parties without the EXPLICIT consent from those parties. (C) Copyright 2016, Opersys inc. These slides created by: Karim Yaghmour Originals at: www.opersys.com/community/docs Delivered and/or customized by
- 3. 3 About ● Author of: ● Introduced Linux Trace Toolkit in 1999 ● Originated Adeos and relayfs (kernel/relay.c) ● Training, Custom Dev, Consulting, ...
- 4. 4 Agenda 1. A bit of history 2. Architecture 3. Source layout 4. Images 5. User-space 6. Services / Daemons 7. Weave 8. Example 9. Summing up
- 5. 5 1. A bit of history ● Embedded Linux ● Android ● Headless Android ● Brillo
- 6. 6 1.1. Embedded Linux ● A set of ad-hoc methods to package the Linux kernel with a (minimal) filesystem. ● FS content “to be determined” case-by-case ● APIs are specific to each device/build ● “Core software”: ● BusyBox ● U-Boot ● GNU Toolchain ● Your flavor of: ● glibc or uClibc or eglibc ● yocto or buildroot or eldk or ltib or ptxdist or ... ● No serious UX framework
- 7. 7 1.2. Android ● ... apart from its ubiquitous UX ... ● Fully-integrated IDE: Android Studio ● SDK/NDK ● ADB ● Fastboot ● Published, well-known, and very rich APIs ● A large and growing developer community ● And still we can use “embedded Linux” components: ● GNU toolchain, BusyBox, u- boot, glibc, ... An actual standardized dev. env. across all product lines
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- 10. 10 1.4. Brillo / Weave ● Google platform for IoT* ● Based on Android ● Announced at Google I/O 2015 ● Still not officially released ● Still under active development ● Need to sign up for developer preview on https://developers.google.com/brillo/ ● Sources available from android.googlesource.com ● Note: ● This talk based on sources ● This talk NOT based on developer preview or any information thereof :P * New, hip way of talking about “Embedded Systems”, something that's been around for ~50+ years.
- 11. 11 2. Architecture ● Embedded Linux ● Android ● Binder ● System services ● HAL ● DBus ● Brillo ● Weave
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- 16. 16 /frameworks/base/services/java/... /frameworks/base/services/jni/ /hardware/libhardware/ /device/[MANUF.]/[DEVICE] /sdk/emulator/ Kernel or module /frameworks/base/core/... AOSP-provided ASL Manuf.-provided Manuf. license Manuf.-provided GPL-license
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- 20. 20 3. Source layout ● Getting the sources ● Brillo top level ● Removed from Android top level ● Gone from external/ ● New to external
- 21. 21 3.1. Getting the sources ● Same project repo as Android: android.googlesource.com ● Different manifest file ● Using “repo”: $ repo init u https://android.googlesource.com/brillo/manifest $ repo sync
- 22. 22 3.2. Brillo top level bionic C library replacement bootable Reference bootloader build Build system device Device-specific files and components external Copy of external projects used by AOSP frameworks Native system services and libraries hardware Hardware support libs libnativehelper JNI helpers prebuilts Prebuilt binaries product “Products” running on Brillo system Embedded Linux core tools Brillo Development Kit
- 23. 23 3.3. Removed from Android top level art cts dalvik dvelopers development docs frameworks/base and more libcore ndk packages pdk sdk system/vold and more tools/external
- 24. 24 3.4. Gone from external/
- 25. 25 3.5. New to external/ bvb Brillo Verified Boot chromite Tools to build Chrome OS gentoo libdivsufsort lightweight suffix array construction algorithm library lzop LZO compression tool
- 26. 26 4. Images ● AOSP x86 32-bit: ● 5.1M out/target/product/generic_x86/cache.img ● 1.3M out/target/product/generic_x86/ramdisk.img ● 1.3G out/target/product/generic_x86/system.img ● 12M out/target/product/generic_x86/userdata.img ● 551M out/target/product/generic_x86/userdata-qemu.img ● Brillo x86 64-bit: ● 6.2M out/target/product/brilloemulator_x86_64/boot.img ● 36K out/target/product/brilloemulator_x86_64/partition-table.img ● 158M out/target/product/brilloemulator_x86_64/system.img ● 201M out/target/product/brilloemulator_x86_64/userdata.img ● 551M out/target/product/brilloemulator_x86_64/userdata-qemu.img
- 27. 27 5. User Space
- 28. 28 6. Services / Daemons ● dbus-daemon ● servicemanager ● avahi-daemon ● keystore ● nativeperms ● peripheralman ● sensorservice ● wpa_supplicant ● brilloaudioservice ● metrics_collector ● metriscsd ● perfprofd ● tlsdated ● tpm_managerd ● trunksd ● update_engine ● weaved ● webservd ● shill ● firewalld ● dhcpd
- 29. 29 7. Weave
- 30. 30 8. Example
- 31. 31 9. Summing Up ● Cool use of AOSP ● The “new standard” Embedded Linux distro? ● Yocto ● Buildroot ● Work in progress ● Nice move to Binder (instead of DBus) ● Clear cloud component