Configuring a New Product
Detailed Instructions
下面步骤描述怎样为一个新的移动设备及产品使用makefiles配置Android运行系统。
1.在//vendor/目录下创建一个公司目录.
2.在上面创建的公司目录下（beneath）创建产品（products）目录
3.创建特定产品的makefile。命名为vendor/<company_name>/products/<first_product_name>.mk。这个文件至少要包含如下代码：
#
# Overrides
PRODUCT_NAME := <first_product_name>
PRODUCT_DEVICE := <board_name>
4.另外一些特定产品的变量定义可以添加到这个产品定义(Product Definition：下面有详细说明)文件(3中说的)。
5.在products目录，创建一个AndroidProducts.mk文件，这个文件用来指定(and is responsible for finding)一个特定的产品make 文件（也就是3中的文件）
代码# 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_DIR; do 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.
#
PRODUCT_MAKEFILES := \
$(LOCAL_DIR)/first_product_name.mk \
6.在公司名目录下创建一个特定板级目录，此目录名必须与3中特定产品的makefile 中PRODUCTV_DEVICE变量值<board_name>相同。这个目录下将包括一个makefile文件会被用到此板的产品使用。
7.在上面(vendor/<company_name>/<board_name>)的目录下创建BoardConfig.mk文件：
#
# TARGET_NO_BOOTLOADER := false
#
TARGET_USE_GENERIC_AUDIO := true
8.如果你想更改系统属性(properties)，就在<board_name>目录（6中建立的目录）下创建system.prop文件。
# This overrides settings in the products/generic/system.prop file
#
# rild.libpath=/system/lib/libreference-ril.so
# rild.libargs=-d /dev/ttyS0
9.在products/AndroidProducts.mk 文件中添加一个<second_product_name>.mk指针
$(LOCAL_DIR)/first_product_name.mk \
$(LOCAL_DIR)/second_product_name.mk
10.在vendor/<company_name>/<board_name>目录下必须创建一个Android.mk文件，此文件至少应该包含如下内容：
代码#
LOCAL_PATH := $(call my-dir)
#
# this is here to use the pre-built kernel
ifeq ($(TARGET_PREBUILT_KERNEL),)
TARGET_PREBUILT_KERNEL := $(LOCAL_PATH)/kernel
endif
#
file := $(INSTALLED_KERNEL_TARGET)
ALL_PREBUILT += $(file)
$(file): $(TARGET_PREBUILT_KERNEL) | $(ACP)
$(transform-prebuilt-to-target)
#
# no boot loader, so we don't need any of that stuff..
#
LOCAL_PATH := vendor/<company_name>/<board_name>
#
include $(CLEAR_VARS)
#
# include more board specific stuff here? Such as Audio parameters.
#
11.在同样的板上创建第二个产品，这第二个特定产品的make file文件命名为vendor/company_name/products/<second_product_name>.mk 包括如下内容：
#
# Overrides
PRODUCT_NAME := <second_product_name>
PRODUCT_DEVICE := <board_name>
这样你就有两个产品，也就是与<company_name>相关的被命名为<first_product_name>和<second_product_name>。可执行如下命令来验证产品已经被很好的配置（以<first_product_name>为例）：
make PRODUCT-<first_product_name>-user
然后就会在/out/target/product/<board_name>目录下生成新编译出的二进制文件
New Product File Tree
<company_name><board_name>Android.mkproduct_config.mksystem.propproductsAndroidProducts.mk<first_product_name>.mk<second_product_name>.mk
Product Definition Files
产品特定的变量被定义在产品说明文件(definition files)中。产品说明文件可以继承自其它的产品说明文件。这样将便于管理(thus reducing the need to copy and simplifying maintenance)。
产品说明文件中可以包含如下变量：
| Parameter | Description | Example |
|---|---|---|
| PRODUCT_NAME | End-user-visible name for the overall product. Appears in the "About the phone" info. | |
| PRODUCT_MODEL | End-user-visible name for the end product | |
| PRODUCT_LOCALES | A space-separated list of two-letter language code, two-letter country code pairs that describe several settings for the user, such as the UI language and time, date and currency formatting. The first locale listed in PRODUCT_LOCALES is is used if the locale has never been set before. | en_GB de_DE es_ES fr_CA |
| PRODUCT_PACKAGES | Lists the APKs to install. | Calendar Contacts |
| PRODUCT_DEVICE | Name of the industrial design | dream |
| PRODUCT_MANUFACTURER | Name of the manufacturer | acme |
| PRODUCT_BRAND | The brand (e.g., carrier) the software is customized for, if any | |
| PRODUCT_PROPERTY_OVERRIDES | List of property assignments in the format "key=value" | |
| PRODUCT_COPY_FILES | List of words like source_path:destination_path. The file at the source path should be copied to the destination path when building this product. The rules for the copy steps are defined in config/Makefile | |
| PRODUCT_OTA_PUBLIC_KEYS | List of OTA public keys for the product | |
| PRODUCT_POLICY | Indicate which policy this product should use | |
| PRODUCT_PACKAGE_OVERLAYS | Indicate whether to use default resources or add any product specific overlays | vendor/acme/overlay |
| PRODUCT_CONTRIBUTORS_FILE | HTML file containing the contributors to the project. | |
| PRODUCT_TAGS | list of space-separated words for a given product |
典型产品说明文件如下：
#Overrides
PRODUCT_NAME := MyDevice
PRODUCT_MANUFACTUER := acme
PRODUCT_BRAND := acme_us
PRODUCT_LOCALES := en_GB es_ES fr_FR
PRODUCT_PACKAGE_OVERLAYS := vendor/acme/overlay
。。。。