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研究生:張敏杰
研究生(外文):Min-Chieh Chang
論文名稱:基於ARM架構之Android嵌入式系統啟動加速術
論文名稱(外文):Fast booting technique of embedded Android system based on ARM architecture
指導教授:王尉任王尉任引用關係
指導教授(外文):Wei-Jen Wang
學位類別:碩士
校院名稱:國立中央大學
系所名稱:資訊工程學系在職專班
學門:工程學門
學類:電資工程學類
論文出版年:2020
畢業學年度:108
語文別:中文
論文頁數:50
中文關鍵詞:Android系統Fast bootingU-BootLinux KernelFilesystem
外文關鍵詞:Android systemFast bootingU-BootLinux KernelFilesystem
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伴隨著物聯網,車聯網的日益發展快速,在這其中因ARM架構處理器的省電低功耗,低成本及SoC(system on a chip)強大的周邊I/O應用整合,可輕易將許多sensor與device集成在一起,這也使得client端ARM處理器架構的系統越來越普及,功能越來多元,而Android系統便是其中備受廣泛應用的系統之一,也因其可高度客制化與open source的關係,使其中發展至今已由手機延伸到車載電子。
而車載電子因其特殊的使用環境而無法持續穩定的供電,例如在汽車引擎熄火後所有電子裝置只能由電瓶供電,所以大部分車載電子為了減少電力消耗會切換系統狀態至省電模式或切斷電源,等待引擎發動時再切換回原本的工作模式,因此如何縮短車載Android系統在狀態切換所消耗的時間就成了一個很重要的solution。
快速啟動技術主要根據嵌入式系統之特性,透過優化系統的資料傳輸與刪除不必要初始步驟,使系統更能以最短的時間進入工作狀態,本研究將以現存的加速技術中,最佳化適合目前Android系統架構之技術,經實驗測試,優化後的效能相較優化前減少了50%的啟動時間。

關鍵字:Android系統、Fast booting、U-Boot、Linux Kernel、Filesystem

Due to the Internet of Things, the Internet of Vehicles is growing rapidly. Among them, because of the power-saving and low power consumption of ARM-based processors, the low cost, and the powerful SoC (System on a chip) can easily merge the peripheral I/O applications, it is easy to integrate many sensors and devices to be integrated together, and makes the client-side ARM processor architecture system more and more popular, and the functions are more and more diverse, so Android system is one of the most widely used systems because it can be highly customized and open source so that it extended the development from mobile phones to vehicle electronics.
However, due to its special use environment, vehicle electronics cannot continuously and stably supply power. For example, all electronic devices can only be powered by batteries after the car engine is turned off. Therefore, in order to reduce power consumption, most vehicle electronics will switch the system state to the power saving mode or Turn off the power and wait for the engine to start before switching back to the original working model. Therefore, how to shorten the time consumed by the embedded Android system during state switching has become an important solution.
The quick-start technology is mainly based on the embedded system's characteristic, by optimizing the system's data transmission and deleting unnecessary initial step so that the system can enter the working state in the shortest time. This study will use the existing acceleration technology to optimize the suitability the technology of the current Android system architecture, after experimental testing, the optimized performance reduces the startup time by 50% compared with before the optimization.
Keyword: Android system、Fast booting、U-Boot、Linux Kernel、Filesystem

摘要 i
Abstract ii
目錄 iii
圖目錄 v
表目錄 vii
第一章 緒論 1
1-1 前言 1
1-2 研究動機 1
1-3 論文貢獻 2
1-4 論文架構 2
第二章 背景知識 3
2-1 背景技術 3
2-1-1 U-Boot功能介紹 3
2-1-2 Android系統介紹 4
2-1-3 Android 啟動流程 7
2-1-4 Linux Kernel 壓縮技術 8
2-1-5 Linux kernel image 9
2-1-6 LZ4 壓縮演算法 9
2-1-7 設備樹(Device tree) 10
2-1-8 ARM交叉編譯器(ARM cross compiler) 10
2-1-9 Android NDK(Native Development Kit) 11
2-2 啟動加速技術介紹 12
2-2-1 U-Boot Falcon mode 12
2-2-2 Linux Readahead 13
2-2-3 Android Framework 剪裁優化技術 13
第三章 系統架構 14
3-1 主要架構 14
3-2 系統建構流程 16
3-2-1 Bootloader 16
3-2-2 Linux kernel 16
3-2-3 File system setting 16
3-3 優化方法 17
3-3-1 U-Boot falcon mode 17
3-3-2 LZ4 Kernel expression method 18
3-3-3 Linux Kernel readahead 22
3-3-4 系統 App 裁剪 25
3-3-5 Zygote優化 27
第四章 實驗結果與分析 28
4-1 實驗環境與測量方法 28
4-2 實驗結果與效能分析 29
4-2-1 優化方法一: U-Boot falcon mode 29
4-2-2 優化方法二: LZ4 Kernel expression method 30
4-2-3 優化方法三: Linux Kernel readahead 31
4-2-4 優化方法四: 系統 App 裁剪 32
4-2-5 優化方法五: Zygote優化 33
4-2-6 綜合測試 34
第五章 結論與未來研究方向 35
參考資料 36
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