《2010 Android平台社群開發大會– Using High Level View on Android Porting》.
Copyright ... http://developer.Android.com/guide/basics/what-is-Android.html ...
Using High Level View on Android Porting Mask (鍾文昌)
[email protected]
http://www.mask.org.tw
作者簡介
http://www.mask.org.tw 鍾文昌 Mask 數年 Linux 及 Embedded Linux 相關開發經驗，開發產品包含 Set-Top-Box、手機及快速開機軟體等相關產品，接觸過 x86、 MIPS 及 ARM platform，對 Linux kernel、Linux device driver、Shared Library、Application 等皆有所涉獵。 在 IC 廠完全沒有支援 Android 的情況下，獨立 移植 Android 至 PXA270、OMAP3530 等硬體 平台。 豐富的 Android Porting 授課經驗。
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android 1.0 on PXA270
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android 1.5 on OMAP3530
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Demo
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Using High Level View on Android Porting z z z z z
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Linux booting procedure How to trace Linux kernel Android booting procedure How to trace Android source code Treat Android as Black Box
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Embedded Linux System Architecture
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android Architecture
http://developer.Android.com/guide/basics/what-is-Android.html 8
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Embedded Linux System Boot Sequence
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
How to Construct An Embedded Linux System
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android Porting Flow
http://developer.Android.com/guide/basics/what-is-Android.html 11
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android Porting Flow (cont)
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android Porting Flow (cont)
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Key of Porting Android z
Complex but not difficult z z z z z
z
Attitude Luckiness Linux system architecture Software utilities Experience
Only 2 ways z z
ctags Burst-force z find
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& grep
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Porting Strategy of Linux Kernel for Android
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Real Case on Porting Linux Kernel for Android
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Real Case on Porting Linux Kernel for Android (cont)
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Use Tools to Port Linux Kernel for Android z
Linux platform z Meld z KDiff
z
Windows platform z WinMerge
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Meld
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
KDiff3
http://kdiff3.sourceforge.net/doc/screenshots.html 20
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
WinMerge
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Potential Problems on Porting Linux Kernel z
Data structure z z
z
Init section z
z
Only consider the BSP changed from the official Linux kernel
File name changed z
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Reference successfully compiled drivers
Source dispersed z
z
Reference similar platforms Reference multiple versions of Linux kernel
Same as the previous item
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android Booting Procedure z
system/core/init/init.c (/init) z /init.rc z Daemons z adbd z rild z…
z
Zygote z Service Manager z System Service 23
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
How to Trace Android Source Code z
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ctags --C++-kinds=+p -R
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Logcat
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Android BatteryService Workflow
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Battery Driver z
Battery Driver creates the following sysfs entries z z z z z z z z z
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/sys/class/power_supply/ac/online /sys/class/power_supply/usb/online /sys/class/power_supply/battery/status /sys/class/power_supply/battery/health /sys/class/power_supply/battery/present /sys/class/power_supply/battery/capacity /sys/class/power_supply/battery/batt_vol /sys/class/power_supply/battery/batt_temp /sys/class/power_supply/battery/technology
《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Relationship between Input Keys and Android Services
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
Q&A
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《2010 Android平台社群開發大會 – Using High Level View on Android Porting》 Copyright © 2009 - 2010 Mask. http://www.mask.org.tw
