I was tring to compile a dts file and tried command with make

dtc -I dts -O dtb -@ -I /home/pi/rpisrc/linux/arch/arm64/boot/dts -o sss.dtb sss.dts

but it through out an error like

FATAL ERROR: Unknown input format: /home/pi/rpisrc/linux/arch/arm64/boot/dts.

What format does flag -I expect? I’m sure the directory is exist. What’s the problem?

For details this is my Makefile below

#Makefile for compiling a single device tree source file


#dts name without extend

DTS_NAME = sss

#Output dir

OUTPUT_DIR = ./output

#cross compile tool chain

CROSS_COMPILE = DTC = $(CROSS_COMPILE)dtc

#Options

#generate dtb, enable symbols, overlays

DTC_FLAGS = -I dts -O dtb -@

#Linux kernel device tree include path

LINUX_KERNEL_DIR = /home/pi/rpisrc/linux

INCLUDE_PATH = -I $(LINUX_KERNEL_DIR)/arch/arm64/boot/dts

#Target file

DTB_FILE = $(OUTPUT_DIR)/$(DTS_NAME).dtb

#Default

all: $(DTB_FILE)

#Command

$(DTB_FILE): $(DTS_NAME).dts

mkdir -p $(OUTPUT_DIR)

$(DTC) $(DTC_FLAGS) $(INCLUDE_PATH) -o $@ $<

$(info DTC command: $(DTC) $(DTC_FLAGS) $(INCLUDE_PATH) -o $@ $<)

#Clean

clean: rm -rf $(OUTPUT_DIR)

.PHONY: all clean