将linux和uboot集成到Android编译框架中

时间：2022-07-13 08:03:17

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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：
 
 

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

将linux和uboot集成到Android编译框架中
  • 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 :=

BOARD_USERDATAIMAGE_PARTITION_SIZE :=

BOARD_CACHEIMAGE_PARTITION_SIZE :=

BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4

BOARD_FLASH_BLOCK_SIZE :=
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)  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
将linux和uboot集成到Android编译框架中
  • lunch
pengdonglin@pengdonglin-dell:~/Android7_1$ lunch

You're building on Linux

Lunch menu... pick a combo:

     . aosp_arm-eng

     . aosp_arm64-eng

     . aosp_mips-eng

     . aosp_mips64-eng

     . aosp_x86-eng

     . aosp_x86_64-eng

     . full_fugu-userdebug

     . aosp_fugu-userdebug

     . mini_emulator_arm64-userdebug

     . m_e_arm-userdebug

     . m_e_mips64-eng

     . m_e_mips-userdebug

     . mini_emulator_x86_64-userdebug

     . mini_emulator_x86-userdebug

     . aosp_dragon-userdebug

     . aosp_dragon-eng

     . aosp_marlin-userdebug

     . aosp_sailfish-userdebug

     . aosp_flounder-userdebug

     . aosp_angler-userdebug

     . aosp_bullhead-userdebug

     . hikey-userdebug

     . aosp_shamu-userdebug

     . myproduct-userdebug

Which would you like? [aosp_arm-eng] 

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

PLATFORM_VERSION_CODENAME=REL

PLATFORM_VERSION=7.1.

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.--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.

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.--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.

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.--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

将linux和uboot集成到Android编译框架中
 

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 -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 >& ; echo $$?))

ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),)

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=../../$(KERNEL_MODULES_INSTALL) INSTALL_MOD_STRIP= ARCH=$(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。
将linux和uboot集成到Android编译框架中

5、编译

. build/envsetup.sh
lunch 24
make bootimage

. build/envsetup.sh
lunch 24
make bootimage

将linux和uboot集成到Android编译框架中

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

--- a/core/main.mk

+++ b/core/main.mk

@@ -, +, @@ 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

@@ -, +, @@ 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.

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.--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 `.'

[% /] Cleaning kernel...

#### make completed successfully ( 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

--- a/core/Makefile

+++ b/core/Makefile

@@ -, +, @@ 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

--- a/core/main.mk

+++ b/core/main.mk

@@ -, +, @@ 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

@@ -, +, @@ endif

 .PHONY: ramdisk

 ramdisk: $(INSTALLED_RAMDISK_TARGET)

+.PHONY: u-boot

+u-boot: $(INSTALLED_U-BOOT_TARGET)

+

 .PHONY: systemtarball

 systemtarball: $(INSTALLED_SYSTEMTARBALL_TARGET)

@@ -, +, @@ 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=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_start | cut -f  -d ' '); end=$(aarch64-linux-android-nm u-boot | grep __rel_dyn_end | cut -f  -d ' '); tools/relocate-rela u-boot-nodtb.bin 0x00000000 $start $end

  COPY    u-boot.bin

  CFGCHK  u-boot.cfg

make[]: Leaving directory '/home/pengdonglin/Android7_1/out/target/product/myproduct/obj/U-BOOT_OBJ'

make: Leaving directory '/home/pengdonglin/Android7_1/bootable/u-boot'

[% /] 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.

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.--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 `.'

[% /] Cleaning u-boot...

#### make completed successfully  ####
完。

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