aosp是什么意思

aosp代指安卓原生系统。

原生安卓系统（Android）是指Google公司发布，没有经过第三方修改的安卓系统，是操作系统最基层的也是最纯净的版本。

一般来说，主要是指各操作系统生产商最初建立的模型，各公司在模型的基础上再不断改进和优化，生产出不同的新版本

扩展资料：

Android是一种基于Linux的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由Google公司和开放手机联盟领导及开发。

尚未有统一中文名称，中国大陆地区较多人使用“安卓”或“安致”。Android操作系统最初由Andy Rubin开发，主要支持手机。

2005年8月由Google收购注资。2007年11月，Google与84家硬件制造商、软件开发商及电信营运商组建开放手机联盟共同研发改良Android系统。

随后Google以Apache开源许可证的授权方式，发布了Android的源代码。第一部Android智能手机发布于2008年10月。

Android逐渐扩展到平板电脑及其他领域上，如电视、数码相机、游戏机、智能手表等。2011年第一季度，Android在全球的市场份额首次超过塞班系统，跃居全球第一。

2013年的第四季度，Android平台手机的全球市场份额已经达到78.1%。 2013年09月24日谷歌开发的操作系统Android在迎来了5岁生日，全世界采用这款系统的设备数量已经达到10亿台。

2014第一季度Android平台已占所有移动广告流量来源的42.8%，首度超越iOS。但运营收入不及iOS。

This is a breakdown of the files build/envsetup.sh, Makefile and the files they use, which describes how a device is specified and how Android is configured for it.

For each file there are some comments and code lines from the make files or scripts, which describe what they are doing and which files they are using. Also the files which can be used as an example are presented and the commands how to search for them.

This text is for developers who want to add a new device or change the configuration of an existing device. This gives some indications which files are involved.

== build/envsetup.sh ==

Some functions are defined by calling

<pre>

. build/envsetup.sh

</pre>

in the top directory.

Some environment variables are set by calling

<pre>

lunch

</pre>

in the top directory.

<pre>

export TARGET_PRODUCT= variant

export TARGET_SIMULATOR=false

export TARGET_BUILD_TYPE=release

</pre>

vendorsetup.sh is searched at this places:

<pre>

vendor/ /vendorsetup.sh

vendor/ / /vendorsetup.sh

device/ /*/vendorsetup.sh

</pre>

== vendorsetup.sh ==

This file is executed by build/envsetup.sh, and can use anything

defined in envsetup.sh.

In particular, you can add lunch options with the add_lunch_combo

function:

<pre>

add_lunch_combo full_crespo-userdebug

</pre>

The values of the macros TARGET_PRODUCT and TARGET_BUILD_VARIANT are derived from the option name: add_lunch_combo TARGET_BUILD_VARIANT

In the above example the resulting values are TARGET_PRODUCT=full_crespo and TARGET_BUILD_VARIANT=userdebug.

These files can be used as an example:

<pre>

find . -name vendorsetup.sh

</pre>

<pre>

./device/samsung/crespo/vendorsetup.sh

./device/samsung/crespo4g/vendorsetup.sh

./device/htc/passion/vendorsetup.sh

</pre>

== Makefile ==

Build process is started by calling

<pre>

make

</pre>

in the top directory.

The Makefile calls build/core/main.mk

== build/core/main.mk ==

Set up various standard variables based on configuration and host information.

<pre>

include $(BUILD_SYSTEM)/config.mk

</pre>

This allows us to force a clean build - included after the config.make

environment setup is done, but before we generate any dependencies. This

file does the rm -rf inline so the deps which are all done below will

be generated correctly

<pre>

include $(BUILD_SYSTEM)/cleanbuild.mk

</pre>

These are the modifier targets that don't do anything themselves, but

change the behavior of the build.

(must be defined before including definitions.make)

<pre>

INTERNAL_MODIFIER_TARGETS := showcommands checkbuild all

</pre>

Bring in standard build system definitions.

<pre>

include $(BUILD_SYSTEM)/definitions.mk

</pre>

== build/core/config.mk ==

Various mappings to avoid hard-coding paths all over the place

<pre>

include $(BUILD_SYSTEM)/pathmap.mk

</pre>

Try to include buildspec.mk, which will try to set stuff up.

If this file doesn't exist, the environemnt variables will

be used, and if that doesn't work, then the default is an

arm build

<pre>

-include $(TOPDIR)buildspec.mk

</pre>

Define most of the global variables. These are the ones that

are specific to the user's build configuration.

<pre>

include $(BUILD_SYSTEM)/envsetup.mk

</pre>

Search for BoardConfig.mk in

(TARGET_DEVICE)/BoardConfig.mk

device/*/ (TARGET_DEVICE)/BoardConfig.mk

and load the file

<pre>

include $(board_config_mk)

</pre>

<pre>

include $(BUILD_SYSTEM)/dumpvar.mk

</pre>

== BoardConfig.mk ==

These files can be used as an example:

<pre>

find . -name BoardConfig.mk

</pre>

<pre>

./device/samsung/crespo/BoardConfig.mk

./device/samsung/crespo4g/BoardConfig.mk

./device/htc/passion/BoardConfig.mk

./build/target/board/generic/BoardConfig.mk

./build/target/board/generic_x86/BoardConfig.mk

./build/target/board/emulator/BoardConfig.mk

./build/target/board/sim/BoardConfig.mk

</pre>

== build/buildspec.mk.default ==

This is a do-nothing template file. To use it, copy it to a file

named "buildspec.mk" in the root directory, and uncomment or change

the variables necessary for your desired configuration. The file

"buildspec.mk" should never be checked in to source control.

Choose a product to build for. Look in the products directory for ones

that work.

TARGET_PRODUCT

Choose a variant to build. If you don't pick one, the default is eng.

User is what we ship.

Userdebug is that, with a few flags turned on

for debugging.

Eng has lots of extra tools for development.

TARGET_BUILD_VARIANT

CUSTOM_MODULES

TARGET_SIMULATOR

Set this to debug or release if you care. Otherwise, it defaults to

release for arm and debug for the simulator.

TARGET_BUILD_TYPE

HOST_BUILD_TYPE

DEBUG_MODULE_ModuleName

TARGET_TOOLS_PREFIX

HOST_CUSTOM_DEBUG_CFLAGS

TARGET_CUSTOM_DEBUG_CFLAGS

CUSTOM_LOCALES

OUT_DIR

ADDITIONAL_BUILD_PROPERTIES

NO_FALLBACK_FONT

WEBCORE_INSTRUMENTATION

ENABLE_SVG

BUILD_ENV_SEQUENCE_NUMBER

== build/envsetup.mk ==

Set up version information.

<pre>

include $(BUILD_SYSTEM)/version_defaults.mk

</pre>

If you update the build system such that the environment setup

or buildspec.mk need to be updated, increment this number, and

people who haven't re-run those will have to do so before they

can build. Make sure to also update the corresponding value in

buildspec.mk.default and envsetup.sh.

<pre>

CORRECT_BUILD_ENV_SEQUENCE_NUMBER := 10

</pre>

<pre>

include $(BUILD_SYSTEM)/product_config.mk

</pre>

TARGET_PRODUCT: sim full

TARGET_BUILD_VARIANT: eng user userdebug tests

== build/core/version_defaults.mk ==

Handle various build version information.

Guarantees that the following are defined:

PLATFORM_VERSION

PLATFORM_SDK_VERSION

PLATFORM_VERSION_CODENAME

DEFAULT_APP_TARGET_SDK

BUILD_ID

BUILD_NUMBER

Look for an optional file (BUILD_SYSTEM)/build_id.mk

</pre>

== build/core/build_id.mk ==

BUILD_ID is usually used to specify the branch name

BUILD_ID

DISPLAY_BUILD_NUMBER

== build/product_config.mk ==

Provide "PRODUCT-<prodname>-<goal>" targets, which lets you build

a particular configuration without needing to set up the environment.

<pre>

TARGET_PRODUCT := (product_goals))

TARGET_BUILD_VARIANT := (product_goals))

</pre>

Provide "APP-<appname>" targets, which lets you build

an unbundled app.

Include the product definitions.

We need to do this to translate TARGET_PRODUCT into its

underlying TARGET_DEVICE before we start defining any rules.

PRODUCT_DEVICE is defined in the product file (TARGET_PRODUCT).mk is searched in the list of product make files $(PRODUCT_MAKEFILES).

PRODUCT_MAKEFILES is set in AndroidProducts.mk files.

<pre>

(call get-product-makefiles,

$(SRC_TARGET_DIR)/product/AndroidProducts.mk))

</pre>

Convert a short name like "sooner" into the path to the product

file defining that product.

<pre>

INTERNAL_PRODUCT := (TARGET_PRODUCT))

</pre>

<pre>

TARGET_DEVICE := (INTERNAL_PRODUCT).PRODUCT_DEVICE)

PRODUCT_LOCALES := (PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_LOCALES))

PRODUCT_BRAND

PRODUCT_MODEL

PRODUCT_MANUFACTURER

</pre>

<pre>

PRODUCT_OTA_PUBLIC_KEYS

</pre>

== AndroidProducts.mk ==

This file should set PRODUCT_MAKEFILES to a list of product makefiles

to expose to the build system. LOCAL_DIR will already be set to

the directory containing this file.

This file may not rely on the value of any variable other than

LOCAL_DIRdo not use any conditionals, and do not look up the

value of any variable that isn't set in this file or in a file that

it includes.

File device/samsung/crespo/AndroidProducts.mk

<pre>

PRODUCT_MAKEFILES :=

$(LOCAL_DIR)/full_crespo.mk

</pre>

These files can be used as an example:

<pre>

find . -name AndroidProducts.mk

</pre>

<pre>

./device/sample/products/AndroidProducts.mk

./device/samsung/crespo/AndroidProducts.mk

./device/samsung/crespo4g/AndroidProducts.mk

./device/htc/passion/AndroidProducts.mk

./build/target/product/AndroidProducts.mk

</pre>

The command which returns the list of all AndroidProducts.mk files is defined in build/core/product.mk :

<pre>

define _find-android-products-files

(shell test -d vendor &&find vendor -maxdepth 6 -name AndroidProducts.mk)

$(SRC_TARGET_DIR)/product/AndroidProducts.mk

endef

</pre>

== Product Files ==

Search for the files which can be used as an example:

<pre>

grep -R PRODUCT_DEVICE device build

</pre>

<pre>

device/samsung/crespo/full_crespo.mk:PRODUCT_DEVICE := crespo

device/samsung/crespo4g/full_crespo4g.mk:PRODUCT_DEVICE := crespo4g

device/htc/passion/full_passion.mk:PRODUCT_DEVICE := passion

build/target/product/sdk.mk:PRODUCT_DEVICE := generic

build/target/product/generic.mk:PRODUCT_DEVICE := generic

build/target/product/generic_x86.mk:PRODUCT_DEVICE := generic_x86

build/target/product/core.mk:PRODUCT_DEVICE := generic

build/target/product/full_x86.mk:PRODUCT_DEVICE := generic_x86

build/target/product/full.mk:PRODUCT_DEVICE := generic

build/target/product/sim.mk:PRODUCT_DEVICE := sim

</pre>

PRODUCT_DEVICE is used in these files

<pre>

build/core/product.mk:PRODUCT_DEVICE

build/core/product_config.mk:TARGET_DEVICE := (INTERNAL_PRODUCT).PRODUCT_DEVICE)

</pre>

== Add new device ==

Add the configuration files for the new device mydevice of the company mycompany.

Create AndroidProducts.mk

<pre>

mkdir -p device/mycompany/mydevice

nano device/mycompany/mydevice/AndroidProducts.mk

</pre>

<pre>

PRODUCT_MAKEFILES :=

$(LOCAL_DIR)/full_mydevice.mk

</pre>

Create file full_mydevice.mk

Example is build/target/product/full.mk

<pre>

nano device/mycompany/mydevice/full_mydevice.mk

</pre>

<pre>

(SRC_TARGET_DIR)/product/full_base.mk)

(SRC_TARGET_DIR)/board/generic/device.mk)

PRODUCT_NAME := full_mydevice

PRODUCT_DEVICE := mydevice

PRODUCT_BRAND := Android

PRODUCT_MODEL := Full Android on mydevice

</pre>

Create file vendorsetup.sh

<pre>

nano device/mycompany/mydevice/vendorsetup.sh

</pre>

<pre>

add_lunch_combo full_mydevice-eng

</pre>

Create file BoardConfig.mk

Examples are

build/target/board/generic/BoardConfig.mk

device/samsung/crespo/BoardConfig.mk

device/samsung/crespo/BoardConfigCommon.mk

<pre>

mkdir -p device/mycompany/mydevice

nano device/mycompany/mydevice/BoardConfig.mk

</pre>

<pre>

TARGET_NO_BOOTLOADER := true

TARGET_NO_KERNEL := true

TARGET_CPU_ABI := armeabi

HAVE_HTC_AUDIO_DRIVER := true

BOARD_USES_GENERIC_AUDIO := true

USE_CAMERA_STUB := true

TARGET_SHELL := mksh

TARGET_ARCH_VARIANT := armv7-a-neon

ARCH_ARM_HAVE_TLS_REGISTER := true

</pre>

Configure Android for mydevice

<pre>

. build/envsetup.sh

</pre>

<pre>

including device/htc/passion/vendorsetup.sh

including device/mycompany/mydevice/vendorsetup.sh

including device/samsung/crespo4g/vendorsetup.sh

including device/samsung/crespo/vendorsetup.sh

</pre>

<pre>

lunch

</pre>

<pre>

You're building on Linux

Lunch menu... pick a combo:

1. full-eng

2. full_x86-eng

3. simulator

4. full_passion-userdebug

5. full_mydevice-eng

6. full_crespo4g-userdebug

7. full_crespo-userdebug

Which would you like? [full-eng] 5

============================================

PLATFORM_VERSION_CODENAME=AOSP

PLATFORM_VERSION=AOSP

TARGET_PRODUCT=full_mydevice

TARGET_BUILD_VARIANT=eng

TARGET_SIMULATOR=false

TARGET_BUILD_TYPE=release

TARGET_BUILD_APPS=

TARGET_ARCH=arm

TARGET_ARCH_VARIANT=armv7-a-neon

HOST_ARCH=x86

HOST_OS=linux

HOST_BUILD_TYPE=release

BUILD_ID=OPENMASTER

============================================

</pre>

Build Android for mydevice

<pre>

make -j4

</pre>

<pre>

Combining NOTICE files: out/target/product/mydevice/obj/NOTICE.html

Target system fs image: out/target/product/mydevice/obj/PACKAGING/systemimage_intermediates/system.img

Install system fs image: out/target/product/mydevice/system.img

Installed file list: out/target/product/mydevice/installed-files.txt

</pre>

[[Category:Android]]