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You're reading from Android System Programming Porting, customizing, and debugging Android HAL

Product type Paperback

Published in May 2017

Publisher Packt

ISBN-13 9781787125360

Length 470 pages

Edition 1st Edition

Languages

Java

Tools

Android

Concepts

Android Development

Authors (2):

Roger Ye

Shen Liu

View More author details

Table of Contents (15) Chapters

Preface

1. Introduction to Android System Programming FREE CHAPTER

2. Setting Up the Development Environment

3. Discovering Kernel, HAL, and Virtual Hardware

4. Customizing the Android Emulator

5. Enabling the ARM Translator and Introducing Native Bridge

6. Debugging the Boot Up Process Using a Customized ramdisk

7. Enabling Wi-Fi on the Android Emulator

8. Creating Your Own Device on VirtualBox

9. Booting Up x86vbox Using PXE/NFS

10. Enabling Graphics

11. Enabling VirtualBox-Specific Hardware Interfaces

12. Introducing Recovery

13. Creating OTA Packages

14. Customizing and Debugging Recovery

Building x86emu with initrd.img

After we did all the analysis of initrd.img for Android-x86, we can build a similar one for the Android emulator now. Be aware that this can work only with ranchu, but not with goldfish. The goldfish emulator uses an older version of QEMU and it doesn't support the additional storage devices for the emulator. To support the boot from initrd.img, we have to change the layout of the filesystem. It is not good to change the original filesystem image in AOSP. We will create another file image to be used for the boot with initrd.img.

In the ranchu emulator, the images are emulated as virtio block devices. After we start the emulator, we can inspect the mount points, as shown in the following screenshot. We can see that system.img is mounted as /dev/block/vda, userdata.img as /dev/block/vdb, and cache.img as /dev/block/vdc:

ranchu images emulated as virtio block devices

All partitions...

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Authors (2)

Liu

Mike Liu studied Mathematics and Software Engineering at Nanjing University and Brandeis University, where he graduated with a Bachelor's degree and a Master's degree, respectively. He is a Sun Certified Java Programmer (SCJP), Microsoft Certified Solution Developer for Visual Studio 6.0, and Microsoft Certified Solution Developer for .NET. He has been working as a software engineer/architect on various platforms (DOS, Unix, and Windows) using C/C++, Java, VB/VB.NET, and C#. Mike started using C# for production development back in the year 2001 when C# was still in beta stage, and he is now working as a senior software engineer for an investment management firm in Boston, Massachusetts, US. Mike had his first book, MITT: Multi-user Integrated Table-processing Tool Under Unix, Beijing Hangtian University Press, published in 1993, and second book, Advanced C# Programming, Tsinghua University Press, published in 2003. The previous three versions of this book were published in 2008, 2010, and 2012.

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Roger Ye

Roger Ye is an embedded system programmer who has great interest in virtualization, Android, and cross-platform technologies. His professional experience includes working with major companies like Motorola, Emerson, Intel, and EPAM, where he held the position of Engineering Manager. At Motorola and Emerson, he worked on embedded system projects for mobile devices and telecommunication infrastructures. He is now an engineering manager at EPAM, working with a team to deliver digital solutions for diverse clients.

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