kernel: Allow building dtbo.img
taimen uses the dtbo.img as an DTB Overlay in order to use the same defconfig for both, taimen and wahoo.
The dtbo.img is built with "make dtbo.img". Allow automatically building it when setting TARGET_NEEDS_DTBOIMAGE to true, or by manually calling make dtboimage.
Thanks to luca020400 for help with the kernel.mk logic
[raymanfx] Add AVB hash footer support
Change-Id: Iaddafaa98e3e84880462a2c35b899e3fea21e161
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 426af62..bfbafc5 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -396,6 +396,17 @@
endif # FULL_KERNEL_BUILD
+TARGET_PREBUILT_DTBO = $(PRODUCT_OUT)/dtbo/arch/$(KERNEL_ARCH)/boot/dtbo.img
+$(TARGET_PREBUILT_DTBO): $(AVBTOOL)
+ echo -e ${CL_GRN}"Building DTBO.img"${CL_RST}
+ $(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(PRODUCT_OUT)/dtbo ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_DEFCONFIG)
+ $(MAKE) $(MAKE_FLAGS) -C $(KERNEL_SRC) O=$(PRODUCT_OUT)/dtbo ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) dtbo.img
+ $(AVBTOOL) add_hash_footer \
+ --image $@ \
+ --partition_size $(BOARD_DTBOIMG_PARTITION_SIZE) \
+ --partition_name dtbo $(INTERNAL_AVB_DTBO_SIGNING_ARGS) \
+ $(BOARD_AVB_DTBO_ADD_HASH_FOOTER_ARGS)
+
## Install it
ifeq ($(NEEDS_KERNEL_COPY),true)
@@ -407,7 +418,19 @@
ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
endif
+ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
+file := $(INSTALLED_DTBOIMAGE_TARGET)
+ALL_PREBUILT += $(file)
+$(file) : $(TARGET_PREBUILT_DTBO) | $(ACP)
+ $(transform-prebuilt-to-target)
+
+ALL_PREBUILT += $(INSTALLED_DTBOIMAGE_TARGET)
+endif
+
.PHONY: kernel
kernel: $(INSTALLED_KERNEL_TARGET)
+.PHONY: dtbo
+dtbo: $(INSTALLED_DTBOIMAGE_TARGET)
+
endif # TARGET_NO_KERNEL