#Android makefile to build kernel as a part of Android Build ifeq ($(KERNEL_DEFCONFIG),) $(error KERNEL_DEFCONFIG must be set as environment variable) endif ifeq ($(INSTALLED_KERNEL_TARGET),) INSTALLED_KERNEL_TARGET := $(PRODUCT_OUT)/kernel INSTALLED_DTBOIMAGE_TARGET := $(PRODUCT_OUT)/dtbo.img BOARD_PREBUILT_DTBOIMAGE := $(PRODUCT_OUT)/prebuilt_dtbo.img INSTALLED_DTB_TARGET := $(PRODUCT_OUT)/dtb.img endif TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH)) ifeq ($(TARGET_KERNEL_ARCH),) KERNEL_ARCH := arm64 else KERNEL_ARCH := $(TARGET_KERNEL_ARCH) endif ifeq ($(CROSS_COMPILE),) KERNEL_CROSS_COMPILE := aarch64-linux-android- else KERNEL_CROSS_COMPILE := $(CROSS_COMPILE) endif SOONG_GLOBAL_CONFIG := build/soong/cc/config/global.go CLANG_VERSION := $(shell grep "ClangDefaultVersion" $(SOONG_GLOBAL_CONFIG) | grep -o "clang-[0-9][0-9]*") CLANG_PATH := prebuilts/clang/host/linux-x86 CC :=$(PWD)/$(CLANG_PATH)/$(CLANG_VERSION)/bin/clang ifeq ($(CLANG_TRIPLE),) CLANG_TRIPLE := aarch64-linux-gnu- else CLANG_TRIPLE := $(CLANG_TRIPLE) endif ifeq ($(TARGET_PREBUILT_KERNEL),) TARGET_KERNEL_SOURCE := kernel/$(TARGET_KERNEL) KERNEL_CONFIG := $(TARGET_KERNEL_SOURCE)/.config KERNEL_BOOT := $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/boot KERNEL_BIN := $(KERNEL_BOOT)/Image KERNEL_DTB_DIR := $(KERNEL_BOOT)/dts/exynos KERNEL_DTB := $(KERNEL_DTB_DIR)/exynos9610.dtb KERNEL_DTBO_CFG := $(KERNEL_DTB_DIR)/$(TARGET_SOC)_dtboimg.cfg MKDTIMG := $(HOST_OUT_EXECUTABLES)/mkdtimg KERNEL_MERGE_CONFIG := $(TARGET_KERNEL_SOURCE)/scripts/kconfig/merge_config.sh KERNEL_CONFIG_BASE := $(TARGET_KERNEL_SOURCE)/arch/$(KERNEL_ARCH)/configs KERNEL_DEFCONFIG_PATH := $(KERNEL_CONFIG_BASE)/$(KERNEL_DEFCONFIG) ifeq ($(KERNEL_DEFCONFIG),) $(error Kernel configuration not defined, cannot build kernel) else ifeq ($(TARGET_BUILD_VARIANT),eng) MAKE_CONFIG_CMD := $(MAKE) -C $(TARGET_KERNEL_SOURCE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) $(KERNEL_DEFCONFIG) else ifeq ($(TARGET_BUILD_VARIANT),userdebug) KERNEL_USER_CFG := $(KERNEL_CONFIG_BASE)/$(TARGET_SOC)_userdebug.cfg else KERNEL_USER_CFG := $(KERNEL_CONFIG_BASE)/$(TARGET_SOC)_user.cfg endif MAKE_CONFIG_CMD := ARCH=$(KERNEL_ARCH) $(KERNEL_MERGE_CONFIG) -m -O $(TARGET_KERNEL_SOURCE) $(KERNEL_DEFCONFIG_PATH) $(KERNEL_USER_CFG); MAKE_CONFIG_CMD += $(MAKE) -C $(TARGET_KERNEL_SOURCE) ARCH=$(KERNEL_ARCH) KCONFIG_ALLCONFIG=.config alldefconfig endif ifeq ($(N_KERNEL_BUILD_THREAD),) N_KERNEL_BUILD_THREAD := 1 endif TARGET_PREBUILT_KERNEL := $(KERNEL_BIN) .PHONY: phony-rebuild .PHONY: kernel kernel: $(KERNEL_BIN) .PHONY: kernel-distclean kernel-distclean: $(MAKE) -C $(TARGET_KERNEL_SOURCE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) distclean $(KERNEL_CONFIG): phony-rebuild $(hide) echo "make $(KERNEL_DEFCONFIG)" $(MAKE_CONFIG_CMD) $(KERNEL_BIN): $(KERNEL_CONFIG) $(hide) echo "Building kernel..." $(MAKE) -C $(TARGET_KERNEL_SOURCE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) CLANG_TRIPLE=$(CLANG_TRIPLE) CC=$(CC) -j$(N_KERNEL_BUILD_THREAD) # mkdtimg cfg_create exynos9610_dtbo.img arch/arm64/boot/dts/exynos/exynos9610_dtboimg.cfg $(INSTALLED_KERNEL_TARGET): $(INSTALLED_DTBOIMAGE_TARGET) cp $(KERNEL_BIN) $(INSTALLED_KERNEL_TARGET) cp $(KERNEL_DTB) $(INSTALLED_DTB_TARGET) $(BOARD_PREBUILT_DTBOIMAGE): $(MKDTIMG) $(KERNEL_DTBO_CFG) $(KERNEL_BIN) $(hide) echo "Building DTBOIMAGE..." ln -sf $(TARGET_KERNEL_SOURCE)/arch $(MKDTIMG) cfg_create $@ $(KERNEL_DTBO_CFG) rm -f arch endif #TARGET_PREBUILT_KERNEL endif #KERNEL_DEFCONFIG