Android移植之系统配置新产品篇

 

Detailed Instructions

The steps below describe how to configure makefiles for new mobile devices and products running Android.

1. Create a company directory in //vendor/.
   

     mkdir vendor/<company_name>

2. Create a products directory beneath the company directory you created in step 1.
   

     mkdir vendor/<company_name>/products/

3. Create a product-specific makefile, called vendor/<company_name>/products/<first_product_name>.mk, that includes at least the following code:
   

     $(call inherit-product, $(SRC_TARGET_DIR)/product/generic.mk)
     #
     # Overrides
     PRODUCT_NAME := <first_product_name>
     PRODUCT_DEVICE := <board_name>

4. Additional product-specific variables can be added to this Product Definition file.
5. In the products directory, create an AndroidProducts.mk file that point to (and is responsible for finding) the individual product make files.
   

     #
     # 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. Create a board-specific directory beneath your company directory that matches the PRODUCT_DEVICE variable <board_name> referenced in the product-specific make file above. This will include a make file that gets accessed by any product using this board.
   

     mkdir vendor/<company_name>/<board_name>

7. Create a BoardConfig.mk file in the directory created in the previous step (vendor/<company_name>/<board_name>).
   

     # These definitions override the defaults in config/config.make for <board_name>
     #
     # TARGET_NO_BOOTLOADER := false
     # TARGET_HARDWARE_3D := false 
     #
     TARGET_USE_GENERIC_AUDIO := true

8. If you wish to modify system properties, create a system.prop file in your <board_name> directory(vendor/<company_name>/<board_name>).
   

     # system.prop for 
     # This overrides settings in the products/generic/system.prop file
     #
     # rild.libpath=/system/lib/libreference-ril.so
     # rild.libargs=-d /dev/ttyS0

9. Add a pointer to <second_product_name>.mk within products/AndroidProducts.mk.
   

     PRODUCT_MAKEFILES := \
       $(LOCAL_DIR)/first_product_name.mk \
       $(LOCAL_DIR)/second_product_name.mk

10. An Android.mk file must be included in vendor/<company_name>/<board_name> with at least the following code:
    

      # make file for new hardware  from 
      #
      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. To create a second product for the same board, create a second product-specific make file called vendor/company_name/products/<second_product_name>.mk that includes:
    

      $(call inherit-product, $(SRC_TARGET_DIR)/product/generic.mk)
      #
      # Overrides
      PRODUCT_NAME := <second_product_name>
      PRODUCT_DEVICE := <board_name>

By now, you should have two new products, called <first_product_name> and <second_product_name> associated with <company_name>. To verify that a product is properly configured (<first_product_name>, for example), execute the following:

  . build/envsetup.sh
  make PRODUCT-<first_product_name>-user

You should find new build binaries located in /out/target/product/<board_name>.

New Product File Tree

The file tree below illustrates what your own system should look like after completing the steps above.

• <company_name>
  • <board_name>
    • Android.mk
    • product_config.mk
    • system.prop
  • products
    • AndroidProducts.mk
    • <first_product_name>.mk
    • <second_product_name>.mk

Product Definition Files

Product-specific variables are defined in product definition files. A product definition file can inherit from other product definition files, thus reducing the need to copy and simplifying maintenance.

Variables maintained in a product definition files include:

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

The snippet below illustrates a typical product definition file.

$(call inherit-product, build/target/product/generic.mk)

#Overrides
PRODUCT_NAME := MyDevice
PRODUCT_MANUFACTURER := acme
PRODUCT_BRAND := acme_us
PRODUCT_LOCALES := en_GB es_ES fr_FR
PRODUCT_PACKAGE_OVERLAYS := vendor/acme/overlay

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