http://source.android.com/porting/build_new_device.html
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.
mkdir vendor/<company_name>
2.在上面创建的公司目录下（beneath）创建产品（products）目录
mkdir vendor/<company_name>/products/
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：
$(call inherit-product, $(SRC_TARGET_DIR)/product/generic.mk)
#
# Overrides
PRODUCT_NAME := <first_product_name>
PRODUCT_DEVICE := <board_name>
#
# 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）
#
# 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 \
# 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 \