Fourth chapter source code download and compile

1. How to download the Android source code environment

First step: Create a directory to hold the download script file repo

#mkdir ~/bin

#PATH =~/bin: $PATH

Step two: Download the repo script file (for downloading Android source code)

#curl Https://dl-ssl.goole.com/dl/goolesource/git-repo/repo>~/bin/repo

#chmod a+x ~/bin/repo

Step three: Create a directory to hold the Android source code

#mkdir Android_source

#cd Android_source

Part fourth: Initialization

#repo init-u https://android.goolesourse.com/platform/manifest

Fifth step: Start downloading the android source code:

#repo Sync

Meaning of the 2.Android source code directory

ADI: Application Binary interface

Bionic:c/c++ run-time library. A large part of the NDK program is called this program.

Bootable: For Android mount and startup programs

Brush Program: Recovery A file in a compressed package = a program that overwrites the system directory in the phone's memory

Build: File tools for programming Android source code and building system.img,ramdisk.img

CTS: Tools for compatibility testing

Dalvik:dalvik the source code of the virtual machine

Development: High-level development and commissioning tools

External: Source code for Extension tools

Framework:android framework layer source code. The source code of the Android SDK

Hardware: Hardware layer interfaces and libraries. Hal's source code is in this directory.

Libcore:java Core Library

Related source code for NDK:NDK

Packages: The source code of the app (APK program) released with the Android system

Prebuilts:android tools to use before compiling on various platforms

SDK: Tools for use in the development environment

System:android's basic system.

3. Download a section of the Android source code in the method:

① using the Repo Sync command

② using the git close command

4. Compiling Android source code

First step: Initializing the compilation environment

SOURCE build/envsetup.sh or:. build/envsetup.sh

MM and mmm two commands can be compiled in the Android source code specified in the project

The mm command must refer to the project's catalog for compilation

MMM can compile any specified project in any level of directory in the Android source code directory structure. As long as you specify the project path.

Step Two: Select the target:

To set the compilation target using the lunch command:

Lunch Full-eng

Step three: compiling Android source code

#make

#make-j4

5. Download the Linux kernel source code:

#git Clone Http://android.goolesoure.com/kernel/common.git

#git branch-a

#git clone http://android. Goolesource.com/kernel/goldfish.git

#git Checkout-b android-goldfish-2.629remotes/origin/android-goldfish-2.6.29

The meaning of the 6.Linux kernel source code directory:

Arch: Source code and configuration files related to CPU architecture

Block: Some device drivers

Crypto: A program to implement a CRC check algorithm for cryptographic decryption

Documentation for the Documentation:linux kernel

Driver: Device driver

Firmware: Some implementation codes for the device firmware to be used by the driver

FS: Implementation code for various file systems. Each directory corresponds to a file system implementation

Include: Contains all the header files required for the Linux kernel. Platform-Independent header files in the Include/linux directory are associated with the platform-related header files in the appropriate subdirectories.

Init: Initializes the implementation code of the kernel program. These programs can pass boot parameters to the Linux kernel

Ipc:linux implementation code for inter-process communication

Kernel: Implementation code for kernel management that is not related to CPU architecture. CPU-related architecture is placed in the arch/<cpu>/kerne/directory

Some libraries used by the Lib:linux kernel

MM: is an architecture-independent implementation code for memory management. Architecture-related memory management implementation code in the appropriate subdirectory of the Arch directory

NET: Implementation code of Network protocol

Samples: Some examples of kernel programming

Scripts: Configuring scripts for the Linux kernel

Security:linux implementation code for security enhancement tools

Sound: Drivers for audio Devices

Implementation code for some of the tools Tools:linux comes with

The implementation code for the Usr:gen_init_cpio command. Gen_init_cpio for integrated file system and Linux kernel

Virt: Implementation code for the kernel virtual machine

8. Cross compiler: Compile programs on the CPU of a architecture that can run on the B-schema CPU

9. Install the cross-compiler:

First step: Prepare

Copy the Arm-liunx-gcc-4.3.2.tgz file and the arm-none-linux-gnueabi-arm-2008q3-72-for-linux.tar.bz2 file to the working directory

Step two: Unzip the compiler

#tar ZXVF arm-linux-gcc-4.3.2.tgz-c/

#tar JXVF arm-none-linux-gnueabi-arm-2008q3-for-linux.tar.bz2-c/

Step three: Verify that the Cross compiler is installed successfully

#ls/usr/local/arm-l

Fourth Step: Install Libncurses 5

#apt-get Install Libncurses5-dev

10.make mproper: Clears all files generated by the compilation + purge configuration file

11.make distclean:make mrproper+ Delete the backup files and patch files left by the editor

12. Configure the 4 commands that are executed by the Linux source root directory:

Make config: This command configures the Linux kernel in textual form.

Make Menuconfig: Configures the Linux kernel as a menu split from the character interface.

Make Oldconfig:make Oldconfig is similar to make config and requires user configuration on a character-by-interface basis. However, make oldconfig shows fewer configuration items than do config that require the user to participate.

Make Xconfig: Configure the Linux kernel as a graphical interface and install Qt:apt-get installation when you run this command Libqt4-dev

Fourth chapter source code download and compile