ESC Boston 2011 BeagleBoard Workshop

1. Embedded Android
Workshop
On BeagleBoard
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2. About me
● Author of:
● Introduced Linux Trace Toolkit in 1999
● Originated Adeos and relayfs (kernel/relay.c)
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3. Agenda
● Goal
● BOM
● MO
● Summary of modifications
● Summary of issues encountered
● Exercises
● Gotchas
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4. Goals
● Hands-on feel of Embedded Android work-cycle
● Experience work w/ functional, real-world
Embedded Android Device and dev env.
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5. BOM
● Your laptop
● BeagleBoard w/ ULCD
● USB-to-Serial
● USB SD programmer
● Class 10 SD card
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6. MO
● 1St time this workshop is given
● Organic
● Peer help
● Different speeds
● Instructor assistance
● No rush
● Online scratchpad
● Have a blast!
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7. Summary of modifications
$ diffstat ulcd­esc­boston­2011­110925
build/core/combo/arch/arm/armv7­a­neon.mk | 1
device/ti/beagleboard/beagleboard.mk | 3
device/ti/beagleboard/init.i2c_setup.sh | 6
device/ti/beagleboard/init.rc | 7
device/ti/beagleboard/ueventd.omap3.rc | 1
frameworks/base/Android.mk | 1
frameworks/base/api/current.xml | 202 +++++++
frameworks/base/core/java/android/app/ContextImpl.java | 16
frameworks/base/core/java/android/content/Context.java | 10
frameworks/base/core/java/android/hardware/chronos/ChronosManager.java | 74 ++
frameworks/base/core/java/android/hardware/chronos/IChronosService.aidl | 14
frameworks/base/services/java/com/android/server/ChronosService.java | 90 +++
frameworks/base/services/java/com/android/server/SystemServer.java | 7
frameworks/base/services/jni/Android.mk | 1
frameworks/base/services/jni/com_android_server_ChronosService.cpp | 178 ++++++
frameworks/base/services/jni/onload.cpp | 2
hardware/libhardware/Android.mk | 2
hardware/libhardware/include/hardware/chronos.h | 28 +
hardware/libhardware/modules/chronos/Android.mk | 14
hardware/libhardware/modules/chronos/chronos.c | 97 +++
kernel/arch/arm/configs/omap3_beagle_android_defconfig | 4
kernel/arch/arm/mach­omap2/board­omap3beagle.c | 158 +++++
kernel/drivers/media/video/omap/omap_vout.c | 9
kernel/drivers/video/omap2/displays/panel­generic.c | 277 ++++++++++
kernel/include/video/omap­panel­generic­dpi.h | 37 +
kernel/kbuild | 1
system/core/include/private/android_filesystem_config.h | 1
7
system/core/rootdir/Android.mk | 7
28 files changed, 1237 insertions(+), 11 deletions(­)

8. Summary of issues encountered
● SD Cards
● Kernel versions
● LCD driver
● Chronos protocol
● Touch-Screen
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9. Exercises
● Build new sources
● Program card
● Boot device w/ programmed card
● Connected device over serial to VM (minicom)
● Browsing around device over serial
● Compile existing code to talk to watch in AOSP
● Merge code into libchronos
● Create APP to talk to Chronos API
● Extras:
● Remove phone signal from status bar
● Stop the Zygote from starting at boot time
● Modify build/core/core.mk to see mk includes
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10. Gotchas / Tricks
● Don't make clean
● Don't touch framework
● Don't reflash all SD every time
● Copy only what you need
● Use logcat
● Use dmesg
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11. Thank you ...
karim.yaghmour@opersys.com
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