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Code  ›  将linux和uboot集成到Android编译框架中 - 摩斯电码
linux系统 target 博客园 u-boot
https://www.cnblogs.com/pengdonglin137/p/10888727.html
冷静的柳树
2 天前
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：

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

2、在myproduct下添加如下几个文件

  • Android.mk
    • 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
  • vendorsetup.sh
    • # 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
    # 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
  • build/envsetup.sh
    • 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$ 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
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)
$(warning Forcing kernel header generation only for '$(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-
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 $$?))
ifeq ($(strip $(KERNEL_GCC_NOANDROID_CHK)),0)
KERNEL_CFLAGS := KCFLAGS=-mno-android
endif
KERNEL_OUT := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ
KERNEL_CONFIG := $(KERNEL_OUT)/.config
ifeq ($(KERNEL_DEFCONFIG)$(wildcard $(KERNEL_CONFIG)),)
$(error Kernel configuration not defined, cannot build kernel)
ifeq ($(TARGET_USES_UNCOMPRESSED_KERNEL),true)
$(info Using uncompressed kernel)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image
ifeq ($(KERNEL_ARCH),arm64)
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/Image.gz
TARGET_PREBUILT_INT_KERNEL := $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/zImage
endif
endif
ifeq ($(TARGET_KERNEL_APPEND_DTB), true)
$(info Using appended DTB)
TARGET_PREBUILT_INT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)-dtb
endif
KERNEL_HEADERS_INSTALL := $(KERNEL_OUT)/usr
KERNEL_MODULES_INSTALL := system
KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules
TARGET_PREBUILT_KERNEL := $(TARGET_PREBUILT_INT_KERNEL)
define mv-modules
mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
if [ "$$mdpath" != "" ];then\
mpath=`dirname $$mdpath`;\
ko=`find $$mpath/kernel -type f -name *.ko`;\
for i in $$ko; do mv $$i $(KERNEL_MODULES_OUT)/; done;\
endef
define clean-module-folder
mdpath=`find $(KERNEL_MODULES_OUT) -type f -name modules.dep`;\
if [ "$$mdpath" != "" ];then\
mpath=`dirname $$mdpath`; rm -rf $$mpath;\
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)

    4、修改device/mycompany/myproduct/BoardConfig.mk

    将TARGET_NO_KERNEL的值修改为false。

    . 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 $(PRODUCT_OUT)/obj/KERNEL_OBJ/
 .PHONY: clobber
 clobber: clean
    pengdonglin@pengdonglin-dell:~/Android7_1$ 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)

    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)

    4、修改device/mycompany/myproduct/BoardConfig.mk

    添加如下内容: 
    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 $(TARGET_NO_KERNEL)),true)
   INSTALLED_KERNEL_TARGET :=
 endif
+ifneq ($(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 $(PRODUCT_OUT)/obj/KERNEL_OBJ/
 .PHONY: clobber
 clobber: clean
    . build/envsetup.sh
    lunch 24
    make u-boot 
    OBJCOPY examples/standalone/hello_world.srec
  OBJCOPY examples/standalone/hello_world.bin
  LD      u-boot
  OBJCOPY u-boot.srec
  OBJCOPY u-boot-nodtb.bin
  SYM     u-boot.sym
start=$(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 $end
  COPY    u-boot.bin
  CFGCHK  u-boot.cfg
make[1]: Leaving directory '/home/pengdonglin/Android7_1/out/target/product/myproduct/obj/U-BOOT_OBJ'
make: Leaving directory '/home/pengdonglin/Android7_1/bootable/u-boot'
[100% 4/4] target Prebuilt:  (out/target/product/myproduct/u-boot.bin)
    make u-boot-clean 
    pengdonglin@pengdonglin-dell:~/Android7_1$ 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  ####

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