环境
Android-7.1
Linux-4.14
u-boot-2018-09
概述
用过高通平台的都知道，人家把Linux内核代码放到了Android代码根目录下的kernel路径下，在编译Android的时候，会连同Linux内核一块编译，最后会将编译出来的Linux内核镜像连同ramdisk.img一块打包到boot.img镜像中。下面我们仿照高通的做法，也将Linux内核代码和uboot代码集成到Android代码中。
Android代码在编译时没有采用递归的方式，而是通过include，在Android代码根目录下生成一个巨大的Makefile。可以参考如下博客：
Android编译系统简要介绍和学习计划
Android编译系统环境初始化过程分析
Android源代码编译命令m/mm/mmm/make分析
Android系统镜像文件的打包过程分析
从CM刷机过程和原理分析Android系统结构
正文
一、建立一个新的产品
下面我们首先添加一个新产品，这个新产品是基于ARMv8架构的。
1、创建如下路径
mkdir -p device/mycompany/myproduct
mkdir -p device/mycompany/myproduct
2、在myproduct下添加如下几个文件
- Android.mk
ifneq ($(filter myproduct, $(TARGET_DEVICE)),) LOCAL_PATH := $(call my-dir) # if some modules are built directly from this directory (not subdirectories), # their rules should be written here. include $(call all-makefiles-under,$(LOCAL_PATH)) endif
ifneq ($(filter myproduct, $(TARGET_DEVICE)),) LOCAL_PATH := $(call my-dir) # if some modules are built directly from this directory (not subdirectories), # their rules should be written here. include $(call all-makefiles-under,$(LOCAL_PATH)) endif
- 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_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)/myproduct.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)/myproduct.mk
- myproduct.mk
# # Inherit the full_base and device configurations $(call inherit-product, $(SRC_TARGET_DIR)/product/full_base.mk) # # Overrides PRODUCT_NAME := myproduct PRODUCT_DEVICE := myproduct
# # Inherit the full_base and device configurations $(call inherit-product, $(SRC_TARGET_DIR)/product/full_base.mk) # # Overrides PRODUCT_NAME := myproduct PRODUCT_DEVICE := myproduct
- BoardConfig.mk
TARGET_NO_BOOTLOADER := true TARGET_NO_KERNEL := true TARGET_NO_RECOVERY := true # Primary Arch TARGET_ARCH := arm64 TARGET_ARCH_VARIANT := armv8-a TARGET_CPU_VARIANT := generic TARGET_CPU_ABI := arm64-v8a # Secondary Arch TARGET_2ND_ARCH := arm TARGET_2ND_ARCH_VARIANT := armv7-a-neon TARGET_2ND_CPU_VARIANT := cortex-a15 TARGET_2ND_CPU_ABI := armeabi-v7a TARGET_2ND_CPU_ABI2 := armeabi TARGET_USES_64_BIT_BINDER := true TARGET_SUPPORTS_32_BIT_APPS := true TARGET_SUPPORTS_64_BIT_APPS := true TARGET_BOARD_PLATFORM := myproduct WITH_DEXPREOPT ?= true BUILD_EMULATOR_OPENGL := true USE_OPENGL_RENDERER := true ANDROID_ENABLE_RENDERSCRIPT := true # Some framework code requires this to enable BT BOARD_HAVE_BLUETOOTH := true BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/generic/common/bluetooth BOARD_USES_GENERIC_AUDIO := true USE_CAMERA_STUB := true TARGET_USERIMAGES_USE_EXT4 := true BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736 BOARD_USERDATAIMAGE_PARTITION_SIZE := 1595915776 BOARD_CACHEIMAGE_PARTITION_SIZE := 268435456 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4 BOARD_FLASH_BLOCK_SIZE := 512
TARGET_NO_BOOTLOADER := true TARGET_NO_KERNEL := true TARGET_NO_RECOVERY := true # Primary Arch TARGET_ARCH := arm64 TARGET_ARCH_VARIANT := armv8-a TARGET_CPU_VARIANT := generic TARGET_CPU_ABI := arm64-v8a # Secondary Arch TARGET_2ND_ARCH := arm TARGET_2ND_ARCH_VARIANT := armv7-a-neon TARGET_2ND_CPU_VARIANT := cortex-a15 TARGET_2ND_CPU_ABI := armeabi-v7a TARGET_2ND_CPU_ABI2 := armeabi TARGET_USES_64_BIT_BINDER := true TARGET_SUPPORTS_32_BIT_APPS := true TARGET_SUPPORTS_64_BIT_APPS := true TARGET_BOARD_PLATFORM := myproduct WITH_DEXPREOPT ?= true BUILD_EMULATOR_OPENGL := true USE_OPENGL_RENDERER := true ANDROID_ENABLE_RENDERSCRIPT := true # Some framework code requires this to enable BT BOARD_HAVE_BLUETOOTH := true BOARD_BLUETOOTH_BDROID_BUILDCFG_INCLUDE_DIR := device/generic/common/bluetooth BOARD_USES_GENERIC_AUDIO := true USE_CAMERA_STUB := true TARGET_USERIMAGES_USE_EXT4 := true BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736 BOARD_USERDATAIMAGE_PARTITION_SIZE := 1595915776 BOARD_CACHEIMAGE_PARTITION_SIZE := 268435456 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4 BOARD_FLASH_BLOCK_SIZE := 512
- vendorsetup.sh
# # Copyright (C) 2013 The Android Open Source Project # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # # 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: add_lunch_combo generic-eng add_lunch_combo myproduct-userdebug
# # Copyright (C) 2013 The Android Open Source Project # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # # 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: add_lunch_combo generic-eng add_lunch_combo myproduct-userdebug
3、编译
- build/envsetup.sh
- lunch
pengdonglin@pengdonglin-dell:~/Android7_1$ lunch You're building on Linux Lunch menu... pick a combo: 1. aosp_arm-eng 2. aosp_arm64-eng 3. aosp_mips-eng 4. aosp_mips64-eng 5. aosp_x86-eng 6. aosp_x86_64-eng 7. full_fugu-userdebug 8. aosp_fugu-userdebug 9. mini_emulator_arm64-userdebug 10. m_e_arm-userdebug 11. m_e_mips64-eng 12. m_e_mips-userdebug 13. mini_emulator_x86_64-userdebug 14. mini_emulator_x86-userdebug 15. aosp_dragon-userdebug 16. aosp_dragon-eng 17. aosp_marlin-userdebug 18. aosp_sailfish-userdebug 19. aosp_flounder-userdebug 20. aosp_angler-userdebug 21. aosp_bullhead-userdebug 22. hikey-userdebug 23. aosp_shamu-userdebug 24. myproduct-userdebug Which would you like? [aosp_arm-eng] 24 ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================
pengdonglin@pengdonglin-dell:~/Android7_1$ lunch You're building on Linux Lunch menu... pick a combo: 1. aosp_arm-eng 2. aosp_arm64-eng 3. aosp_mips-eng 4. aosp_mips64-eng 5. aosp_x86-eng 6. aosp_x86_64-eng 7. full_fugu-userdebug 8. aosp_fugu-userdebug 9. mini_emulator_arm64-userdebug 10. m_e_arm-userdebug 11. m_e_mips64-eng 12. m_e_mips-userdebug 13. mini_emulator_x86_64-userdebug 14. mini_emulator_x86-userdebug 15. aosp_dragon-userdebug 16. aosp_dragon-eng 17. aosp_marlin-userdebug 18. aosp_sailfish-userdebug 19. aosp_flounder-userdebug 20. aosp_angler-userdebug 21. aosp_bullhead-userdebug 22. hikey-userdebug 23. aosp_shamu-userdebug 24. myproduct-userdebug Which would you like? [aosp_arm-eng] 24 ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================
- make
pengdonglin@pengdonglin-dell:~/Android7_1$ make ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct.ninja... out/build-myproduct.ninja is missing, regenerating... ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ FindEmulator: find: File system loop detected; `./linux-4.14/out64/source' is part of the same file system loop as `./linux-4.14'. FindEmulator: find: File system loop detected; `./linux-4.14/out64/source' is part of the same file system loop as `./linux-4.14'. including ./abi/cpp/Android.mk ... including ./art/Android.mk ... including ./bionic/Android.mk ... including ./bootable/recovery/Android.mk ... including ./build/libs/host/Android.mk ... ... ...
pengdonglin@pengdonglin-dell:~/Android7_1$ make ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct.ninja... out/build-myproduct.ninja is missing, regenerating... ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-48-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ FindEmulator: find: File system loop detected; `./linux-4.14/out64/source' is part of the same file system loop as `./linux-4.14'. FindEmulator: find: File system loop detected; `./linux-4.14/out64/source' is part of the same file system loop as `./linux-4.14'. including ./abi/cpp/Android.mk ... including ./art/Android.mk ... including ./bionic/Android.mk ... including ./bootable/recovery/Android.mk ... including ./build/libs/host/Android.mk ... ... ...
二、集成Linux内核源码到Android代码中
1、将Linux内核代码拷贝到Android代码根目录下并重命名为kernel
2、添加AndroidKernel.mk到kernel中
AndroidKernel.mk可以参考： AndroidKernel.mk
内容如下：
#Android makefile to build kernel as a part of Android Build PERL = perl KERNEL_TARGET := $(strip $(INSTALLED_KERNEL_TARGET)) ifeq ($(KERNEL_TARGET),) INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel endif TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH)) ifeq ($(TARGET_KERNEL_ARCH),) KERNEL_ARCH := arm else KERNEL_ARCH := $(TARGET_KERNEL_ARCH) endif TARGET_KERNEL_HEADER_ARCH := $(strip $(TARGET_KERNEL_HEADER_ARCH)) ifeq ($(TARGET_KERNEL_HEADER_ARCH),) KERNEL_HEADER_ARCH := $(KERNEL_ARCH) else $(warning Forcing kernel header generation only for '$(TARGET_KERNEL_HEADER_ARCH)') KERNEL_HEADER_ARCH := $(TARGET_KERNEL_HEADER_ARCH) endif KERNEL_HEADER_DEFCONFIG := $(strip $(KERNEL_HEADER_DEFCONFIG)) ifeq ($(KERNEL_HEADER_DEFCONFIG),) KERNEL_HEADER_DEFCONFIG := $(KERNEL_DEFCONFIG) endif # Force 32-bit binder IPC for 64bit kernel with 32bit userspace ifeq ($(KERNEL_ARCH),arm64) ifeq ($(TARGET_ARCH),arm) KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y endif endif TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)) ifeq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),) KERNEL_CROSS_COMPILE := arm-eabi- else KERNEL_CROSS_COMPILE := $(TARGET_KERNEL_CROSS_COMPILE_PREFIX) endif ifeq ($(TARGET_PREBUILT_KERNEL),) KERNEL_GCC_NOANDROID_CHK := $(shell (echo "int main() {return 0;}" | $(KERNEL_CROSS_COMPILE)gcc -E -mno-android - > /dev/null 2>&1 ; echo $$?)) ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),0) KERNEL_CFLAGS := KCFLAGS=-mno-android endif KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ KERNEL_CONFIG := $(KERNEL_OUT)/.config ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),) $(error Kernel configuration not defined, cannot build kernel) else ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true) $(info Using uncompressed kernel) TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image else ifeq ($(KERNEL_ARCH),arm64) TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz else TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage endif endif ifeq ($(TARGET_KERNEL_APPEND_DTB), true) $(info Using appended DTB) TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb endif KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr KERNEL_MODULES_INSTALL := system KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL) define mv-modules mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\ if [ "$$mdpath" != "" ];then\ mpath=`dirname $$mdpath`;\ ko=`find $$mpath/kernel -type f -name *.ko`;\ for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\ fi endef define clean-module-folder mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\ if [ "$$mdpath" != "" ];then\ mpath=`dirname $$mdpath`; rm -rf $$mpath;\ fi endef $(KERNEL_OUT): mkdir -p $(KERNEL_OUT) $(KERNEL_CONFIG): $(KERNEL_OUT) $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG) $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \ echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \ echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_OUT) $(KERNEL_HEADERS_INSTALL) $(hide) echo "Building kernel..." $(hide) rm -rf $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_CFLAGS) $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_CFLAGS) modules $(MAKE) -C kernel O=../$(KERNEL_OUT) INSTALL_MOD_PATH=../../$(KERNEL_MODULES_INSTALL) INSTALL_MOD_STRIP=1 ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) modules_install $(mv-modules) $(clean-module-folder) $(KERNEL_HEADERS_INSTALL): $(KERNEL_OUT) $(hide) if [ ! -z "$(KERNEL_HEADER_DEFCONFIG)" ]; then \ $(hide) rm -f ../$(KERNEL_CONFIG); \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_HEADER_DEFCONFIG); \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_HEADER_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) headers_install; fi $(hide) if [ "$(KERNEL_HEADER_DEFCONFIG)" != "$(KERNEL_DEFCONFIG)" ]; then \ echo "Used a different defconfig for header generation"; \ $(hide) rm -f ../$(KERNEL_CONFIG); \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG); fi $(hide) if [ ! -z "$(KERNEL_CONFIG_OVERRIDE)" ]; then \ echo "Overriding kernel config with '$(KERNEL_CONFIG_OVERRIDE)'"; \ echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG) $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) tags kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG) env KCONFIG_NOTIMESTAMP=true \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) menuconfig env KCONFIG_NOTIMESTAMP=true \ $(MAKE) -C kernel O=../$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) savedefconfig cp $(KERNEL_OUT)/defconfig kernel/arch/$(KERNEL_ARCH)/configs/$(KERNEL_DEFCONFIG) endif endif
3、在device/mycompany/myproduct/中添加配置文件AndroidBoard.mk
这个AndroidBoard.mk文件会被build/target/board/Android.mk包含。
内容如下：
TARGET_KERNEL_ARCH := arm64 TARGET_KERNEL_CROSS_COMPILE_PREFIX := aarch64-linux-android- TARGET_USES_UNCOMPRESSED_KERNEL := true KERNEL_DEFCONFIG := defconfig include kernel/AndroidKernel.mk $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP) $(transform-prebuilt-to-target)
TARGET_KERNEL_ARCH := arm64 TARGET_KERNEL_CROSS_COMPILE_PREFIX := aarch64-linux-android- TARGET_USES_UNCOMPRESSED_KERNEL := true KERNEL_DEFCONFIG := defconfig include kernel/AndroidKernel.mk $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP) $(transform-prebuilt-to-target)
4、修改device/mycompany/myproduct/BoardConfig.mk
将TARGET_NO_KERNEL的值修改为false。
5、编译
. build/envsetup.sh lunch 24 make bootimage
. build/envsetup.sh
lunch 24
make bootimage
6、添加kernelclean目标
在进行clean的时候，没有必要include那些Android.mk，可以加快执行速度，在build/core/main.mk中提供了一个变量dont_bother_goals，其中的目标在编译时会略过加载Android.mk。
修改build/core/main.mk：
diff --git a/core/main.mk b/core/main.mk index a612f835d..e333a17d5 100644 --- a/core/main.mk +++ b/core/main.mk @@ -87,6 +87,8 @@ dont_bother_goals := clean clobber dataclean installclean \ recoveryimage-nodeps \ product-graph dump-products +dont_bother_goals += kernel-clean + ifneq ($(filter $(dont_bother_goals), $(MAKECMDGOALS)),) dont_bother := true endif @@ -1115,6 +1117,11 @@ clean: @rm -rf $(OUT_DIR)/* @echo "Entire build directory removed." +.PHONY: kernel-clean +kernel-clean: + @echo "Cleaning kernel..." + @rm -rf $(PRODUCT_OUT)/obj/KERNEL_OBJ/ + .PHONY: clobber clobber: clean
diff --git a/core/main.mk b/core/main.mk index a612f835d..e333a17d5 100644 --- a/core/main.mk +++ b/core/main.mk @@ -87,6 +87,8 @@ dont_bother_goals := clean clobber dataclean installclean \ recoveryimage-nodeps \ product-graph dump-products +dont_bother_goals += kernel-clean + ifneq ($(filter $(dont_bother_goals), $(MAKECMDGOALS)),) dont_bother := true endif @@ -1115,6 +1117,11 @@ clean: @rm -rf $(OUT_DIR)/* @echo "Entire build directory removed." +.PHONY: kernel-clean +kernel-clean: + @echo "Cleaning kernel..." + @rm -rf $(PRODUCT_OUT)/obj/KERNEL_OBJ/ + .PHONY: clobber clobber: clean
测试
pengdonglin@pengdonglin-dell:~/Android7_1$ make kernel-clean ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct-kernel-clean.ninja... No need to regenerate ninja file Starting build with ninja ninja: Entering directory `.' [100% 1/1] Cleaning kernel... #### make completed successfully (2 seconds) ####
pengdonglin@pengdonglin-dell:~/Android7_1$ make kernel-clean ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct-kernel-clean.ninja... No need to regenerate ninja file Starting build with ninja ninja: Entering directory `.' [100% 1/1] Cleaning kernel... #### make completed successfully (2 seconds) ####
三、将U-Boot代码集成到Android编译系统中
1、将u-boot-2018.09拷贝到bootable下，并重命名为u-boot
2、在u-boot下添加AndroidU-boot.mk
U-BOOT_TARGET := $(strip $(INSTALLED_U-BOOT_TARGET)) ifeq ($(U-BOOT_TARGET),) INSTALLED_U-BOOT_TARGET := $(PRODUCT_OUT)/u-boot.bin endif TARGET_U-BOOT_ARCH := $(strip $(TARGET_U-BOOT_ARCH)) TARGET_U-BOOT_CROSS_COMPILE_PREFIX := $(strip $(TARGET_U-BOOT_CROSS_COMPILE_PREFIX)) U-BOOT_DEFCONFIG := $(strip $(U-BOOT_DEFCONFIG)) U-BOOT_OUT := $(TARGET_OUT_INTERMEDIATES)/U-BOOT_OBJ U-BOOT_CONFIG := $(U-BOOT_OUT)/.config TARGET_PREBUILT_INT_U-BOOT := $(U-BOOT_OUT)/u-boot.bin TARGET_PREBUILT_U-BOOT := $(TARGET_PREBUILT_INT_U-BOOT) $(U-BOOT_OUT): mkdir -p $(U-BOOT_OUT) $(U-BOOT_CONFIG): $(U-BOOT_OUT) $(MAKE) -C bootable/u-boot O=../../$(U-BOOT_OUT) ARCH=$(TARGET_U-BOOT_ARCH) CROSS_COMPILE=$(TARGET_U-BOOT_CROSS_COMPILE_PREFIX) $(U-BOOT_DEFCONFIG) $(TARGET_PREBUILT_INT_U-BOOT): $(U-BOOT_OUT) $(U-BOOT_CONFIG) $(hide) echo "Building u-boot..." $(MAKE) -C bootable/u-boot O=../../$(U-BOOT_OUT) ARCH=$(TARGET_U-BOOT_ARCH) CROSS_COMPILE=$(TARGET_U-BOOT_CROSS_COMPILE_PREFIX)
U-BOOT_TARGET := $(strip $(INSTALLED_U-BOOT_TARGET)) ifeq ($(U-BOOT_TARGET),) INSTALLED_U-BOOT_TARGET := $(PRODUCT_OUT)/u-boot.bin endif TARGET_U-BOOT_ARCH := $(strip $(TARGET_U-BOOT_ARCH)) TARGET_U-BOOT_CROSS_COMPILE_PREFIX := $(strip $(TARGET_U-BOOT_CROSS_COMPILE_PREFIX)) U-BOOT_DEFCONFIG := $(strip $(U-BOOT_DEFCONFIG)) U-BOOT_OUT := $(TARGET_OUT_INTERMEDIATES)/U-BOOT_OBJ U-BOOT_CONFIG := $(U-BOOT_OUT)/.config TARGET_PREBUILT_INT_U-BOOT := $(U-BOOT_OUT)/u-boot.bin TARGET_PREBUILT_U-BOOT := $(TARGET_PREBUILT_INT_U-BOOT) $(U-BOOT_OUT): mkdir -p $(U-BOOT_OUT) $(U-BOOT_CONFIG): $(U-BOOT_OUT) $(MAKE) -C bootable/u-boot O=../../$(U-BOOT_OUT) ARCH=$(TARGET_U-BOOT_ARCH) CROSS_COMPILE=$(TARGET_U-BOOT_CROSS_COMPILE_PREFIX) $(U-BOOT_DEFCONFIG) $(TARGET_PREBUILT_INT_U-BOOT): $(U-BOOT_OUT) $(U-BOOT_CONFIG) $(hide) echo "Building u-boot..." $(MAKE) -C bootable/u-boot O=../../$(U-BOOT_OUT) ARCH=$(TARGET_U-BOOT_ARCH) CROSS_COMPILE=$(TARGET_U-BOOT_CROSS_COMPILE_PREFIX)
3、修改device/mycompany/myproduct/AndroidBoard.mk
追加如下内容:
TARGET_U-BOOT_ARCH := arm TARGET_U-BOOT_CROSS_COMPILE_PREFIX := aarch64-linux-android- U-BOOT_DEFCONFIG := qemu_arm64_defconfig include bootable/u-boot/AndroidU-boot.mk $(INSTALLED_U-BOOT_TARGET): $(TARGET_PREBUILT_U-BOOT) | $(ACP) $(transform-prebuilt-to-target)
TARGET_U-BOOT_ARCH := arm TARGET_U-BOOT_CROSS_COMPILE_PREFIX := aarch64-linux-android- U-BOOT_DEFCONFIG := qemu_arm64_defconfig include bootable/u-boot/AndroidU-boot.mk $(INSTALLED_U-BOOT_TARGET): $(TARGET_PREBUILT_U-BOOT) | $(ACP) $(transform-prebuilt-to-target)
4、修改device/mycompany/myproduct/BoardConfig.mk
添加如下内容:
TARGET_NO_U-BOOT := false
TARGET_NO_U-BOOT := false
5、修改build/core/Makefile
diff --git a/core/Makefile b/core/Makefile index d8b4ef89b..4b8f8f559 100644 --- a/core/Makefile +++ b/core/Makefile @@ -464,6 +464,11 @@ ifneq ($(strip $(TARGET_NO_KERNEL)),true) else INSTALLED_KERNEL_TARGET := endif +ifneq ($(strip $(TARGET_NO_U-BOOT)),true) + INSTALLED_U-BOOT_TARGET := $(PRODUCT_OUT)/u-boot.bin +else + INSTALLED_U-BOOT_TARGET := +endif # ----------------------------------------------------------------- # the ramdisk
diff --git a/core/Makefile b/core/Makefile index d8b4ef89b..4b8f8f559 100644 --- a/core/Makefile +++ b/core/Makefile @@ -464,6 +464,11 @@ ifneq ($(strip $(TARGET_NO_KERNEL)),true) else INSTALLED_KERNEL_TARGET := endif +ifneq ($(strip $(TARGET_NO_U-BOOT)),true) + INSTALLED_U-BOOT_TARGET := $(PRODUCT_OUT)/u-boot.bin +else + INSTALLED_U-BOOT_TARGET := +endif # ----------------------------------------------------------------- # the ramdisk
6、修改build/core/main.mk
diff --git a/core/main.mk b/core/main.mk index a612f835d..bac8ef18d 100644 --- a/core/main.mk +++ b/core/main.mk @@ -87,6 +87,9 @@ dont_bother_goals := clean clobber dataclean installclean \ recoveryimage-nodeps \ product-graph dump-products +dont_bother_goals += u-boot-clean +dont_bother_goals += kernel-clean + ifneq ($(filter $(dont_bother_goals), $(MAKECMDGOALS)),) dont_bother := true endif @@ -907,6 +910,9 @@ endif .PHONY: ramdisk ramdisk: $(INSTALLED_RAMDISK_TARGET) +.PHONY: u-boot +u-boot: $(INSTALLED_U-BOOT_TARGET) + .PHONY: systemtarball systemtarball: $(INSTALLED_SYSTEMTARBALL_TARGET) @@ -1115,6 +1121,16 @@ clean: @rm -rf $(OUT_DIR)/* @echo "Entire build directory removed." +.PHONY: u-boot-clean +u-boot-clean: + @echo "Cleaning u-boot..." + @rm -rf $(PRODUCT_OUT)/obj/U-BOOT_OBJ/ + +.PHONY: kernel-clean +kernel-clean: + @echo "Cleaning kernel..." + @rm -rf $(PRODUCT_OUT)/obj/KERNEL_OBJ/ + .PHONY: clobber clobber: clean
diff --git a/core/main.mk b/core/main.mk index a612f835d..bac8ef18d 100644 --- a/core/main.mk +++ b/core/main.mk @@ -87,6 +87,9 @@ dont_bother_goals := clean clobber dataclean installclean \ recoveryimage-nodeps \ product-graph dump-products +dont_bother_goals += u-boot-clean +dont_bother_goals += kernel-clean + ifneq ($(filter $(dont_bother_goals), $(MAKECMDGOALS)),) dont_bother := true endif @@ -907,6 +910,9 @@ endif .PHONY: ramdisk ramdisk: $(INSTALLED_RAMDISK_TARGET) +.PHONY: u-boot +u-boot: $(INSTALLED_U-BOOT_TARGET) + .PHONY: systemtarball systemtarball: $(INSTALLED_SYSTEMTARBALL_TARGET) @@ -1115,6 +1121,16 @@ clean: @rm -rf $(OUT_DIR)/* @echo "Entire build directory removed." +.PHONY: u-boot-clean +u-boot-clean: + @echo "Cleaning u-boot..." + @rm -rf $(PRODUCT_OUT)/obj/U-BOOT_OBJ/ + +.PHONY: kernel-clean +kernel-clean: + @echo "Cleaning kernel..." + @rm -rf $(PRODUCT_OUT)/obj/KERNEL_OBJ/ + .PHONY: clobber clobber: clean
7、测试
. build/envsetup.sh
lunch 24
make u-boot
OBJCOPY examples/standalone/hello_world.srec OBJCOPY examples/standalone/hello_world.bin LD u-boot OBJCOPY u-boot.srec OBJCOPY u-boot-nodtb.bin SYM u-boot.sym start=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_start | cut -f 1 -d ' '); end=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_end | cut -f 1 -d ' '); tools/relocate-rela u-boot-nodtb.bin 0x00000000 $start $end COPY u-boot.bin CFGCHK u-boot.cfg make[1]: Leaving directory '/home/pengdonglin/Android7_1/out/target/product/myproduct/obj/U-BOOT_OBJ' make: Leaving directory '/home/pengdonglin/Android7_1/bootable/u-boot' [100% 4/4] target Prebuilt: (out/target/product/myproduct/u-boot.bin)
OBJCOPY examples/standalone/hello_world.srec OBJCOPY examples/standalone/hello_world.bin LD u-boot OBJCOPY u-boot.srec OBJCOPY u-boot-nodtb.bin SYM u-boot.sym start=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_start | cut -f 1 -d ' '); end=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_end | cut -f 1 -d ' '); tools/relocate-rela u-boot-nodtb.bin 0x00000000 $start $end COPY u-boot.bin CFGCHK u-boot.cfg make[1]: Leaving directory '/home/pengdonglin/Android7_1/out/target/product/myproduct/obj/U-BOOT_OBJ' make: Leaving directory '/home/pengdonglin/Android7_1/bootable/u-boot' [100% 4/4] target Prebuilt: (out/target/product/myproduct/u-boot.bin)
make u-boot-clean
pengdonglin@pengdonglin-dell:~/Android7_1$ make u-boot-clean ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct-u-boot-clean.ninja... No need to regenerate ninja file Starting build with ninja ninja: Entering directory `.' [100% 1/1] Cleaning u-boot... #### make completed successfully ####
pengdonglin@pengdonglin-dell:~/Android7_1$ make u-boot-clean ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=7.1.2 TARGET_PRODUCT=myproduct TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm64 TARGET_ARCH_VARIANT=armv8-a TARGET_CPU_VARIANT=generic TARGET_2ND_ARCH=arm TARGET_2ND_ARCH_VARIANT=armv7-a-neon TARGET_2ND_CPU_VARIANT=cortex-a15 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=N2G48H OUT_DIR=out ============================================ Running kati to generate build-myproduct-u-boot-clean.ninja... No need to regenerate ninja file Starting build with ninja ninja: Entering directory `.' [100% 1/1] Cleaning u-boot... #### make completed successfully ####
完。