Android

Android is an Operating System.

Android Build System

The Android Build System, similarly to Buildroot, is a set of build scripts (.mk files, bash scripts) used to build Android.

At the root of the Android Build System, the first thing to do is to set-up the environment: source build/envsetup.sh.

Thus, commands will be available to start the build.

Command	Comments
croot	Jump back to the root directory
godir	Jump into the directory specified as a parameter
mm	Compile the program in the current directory
mm -B	Clean and compile the program in the current directory
lunch	Select the target to build
make kernelimage	Compile the kernel only

Android partition layout

Partition number	Partition	Comments
1	boot	Contains the kernel, the device tree and the initramfs
2	recover	Contains the kernel, the device tree and the initramfs
3
4	data	Can be wiped out
5	system	Contains the Android system
6	cache
7	vendor

Fastboot

Fastboot is a protocol used to communicate to the bootloader of an Android device.

The bootloader should support the fastboot protocol. It allows to flash the device from the host.

Command	Comments
flash	flash system system.img
continue	leave the fastboot mode in the bootloader
boot

netcfg

Android Debug Bridge

adb is a tool used to debug Android devices from the host.

Command	Comments
shell	Open the shell
logcat	Display the log
reboot
sync
push
install -r foo.apk
connect <ip:port>

on target

su setprop service.adb.tcp.port 5555 stop adbd start adbd