Android Deep Exploration (Vol. 1) Hal and Driver Development fourth Chapter reading experience

To configure the Android source code download environment:

The first step: Create a directory to hold the download script file (repo) (you can put the script file in any directory, use ~/bin here).

#mkdir ~/bin

#PATH =~/bin: $PATH

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

#curl Https://dl-ssl.google.com/dl/googlesource/git-repo/repo >~bin/repo

#chmod A+x~/bin/repo

Step three: Create a directory to hold the Android source code (can be placed in other directories)

#mkdir Android_source

#cd Android_source

Fourth Step: Initialize

#repo Init–u Https://android.googlesource.com/platform/manifest

#repo init–u https://android.googlesource.com/mainfest-b Android-4.0.1_r1

1. Start downloading Android source code

#repo Sync

How to download a subproject in the source code

Method One: Use the repo aync command

#repo Sync Platform/bootable/recovery

#repo Sync Platform/packages/apps/camera

Method Two: Use the git clone command

git clone https://android.googlesource.com/<projext name>

git clone https://android.goolesource.com/platform/bootable/recovery

Cf:repo Sync will generate a hidden directory in the current directory. Repo,repo sync Download the source code for the specified project is stored in the actual path

• Steps to compile the Android source code

1. Initializing the compilation environment

#source build/envsetup.sh

or #.build/envsetup.sh.

2. Select target

#lunch Full-eng

3. Compiling Android Source code

#make

#make –J4 4 threads at the same time, the speed will be a bit faster

Download and compile the Linux kernel source code step

1. Download the Linux kernel source code

#git Clone Https://android.googlesource.com/kernek/commomn.git

#git Branch–a

#git Clone Https://android.googlesource.com/kernel/goldfish.git

#git checkout–b andoid-2.6.29 remotes/origin/android/android-goldfish-2.6.29

2, install the Android kernel compilation environment

Configure the Linux kernel source root directory to makefile files, find arch, cross_compile, and assign them to

ARCH =arm.

Cross_compile?-arm-none-linux-guneabi

Steps to install the cross compiler:

A. Preparatory work

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

B. Unzip the compiler

#tar SXVF Arm-linux-gcc-4.3.2.tgz–c

#tar JXVF Arm-none-linux-gnueabi-arm-2008q3-72-fr-linux.tar.bz2–c

C. Verify that the cross-compiler is successfully installed

#ls/usr/local/arm–l

D. Installing Libncurses5-dev

Configuring and compiling the Linux kernel

#export Path=/root/cmpilers/arm-none-linux-qnuabi/bin: $PATH

#cd ~/linux_kernel

#make Clean

#make

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Android Deep Exploration (Volume 1) HAL and Driver Development fourth Chapter reading experience