Makefile

DTS_FILE := adlink-pps-in

DEFAULT_LABEL := $(shell grep "^DEFAULT" /boot/extlinux/extlinux.conf | awk '{print $$2}')
$(warning DEFAULT_LABEL=$(DEFAULT_LABEL))

OVERLAY := $(shell grep "^LABEL $(DEFAULT_LABEL)" -A6 /boot/extlinux/extlinux.conf | grep OVERLAY | awk '{print $$2}')
$(warning CURRENT_OVERLAY=$(OVERLAY))

.PHONY: all dtbo install
all: dtbo install

dtbo:
	# compile dts to dtbo
	dtc -O dtb -o $(DTS_FILE).dtbo -@ $(DTS_FILE).dts

install: dtbo
	# copy dtbo to /boot directory
	sudo cp $(DTS_FILE).dtbo /boot/
	# update extlinux.conf based on current OVERLAY status
ifeq ($(OVERLAY),)
	# OVERLAY is empty, use jetson-io config tool
	@echo "OVERLAY is empty, configuring with jetson-io..."
	sudo cp /boot/extlinux/extlinux.conf /boot/extlinux/extlinux.conf.backup
	sudo /opt/nvidia/jetson-io/config-by-hardware.py -n 1='ADLINK GPIO for PPS_IN Device Tree Overlay'
else
	# OVERLAY is not empty, check if our dtbo is already included
	@echo "Current OVERLAY: $(OVERLAY)"
	@if echo "$(OVERLAY)" | grep -q "adlink-pps-in.dtbo"; then \
		echo "adlink-pps-in.dtbo already exists in OVERLAY, nothing to do."; \
	else \
		echo "Adding adlink-pps-in.dtbo to existing OVERLAY..."; \
		NEW_OVERLAY="$(OVERLAY),/boot/adlink-pps-in.dtbo"; \
		echo "New OVERLAY will be: $$NEW_OVERLAY"; \
		sudo cp /boot/extlinux/extlinux.conf /boot/extlinux/extlinux.conf.backup; \
		sudo sed -i "/^LABEL $(DEFAULT_LABEL)/,/^LABEL\|^$$/{s|^[[:space:]]*OVERLAY[[:space:]]*.*|        OVERLAYS $$NEW_OVERLAY|}" /boot/extlinux/extlinux.conf; \
		echo "extlinux.conf updated successfully."; \
	fi
endif

clean:
	rm -f $(DTS_FILE).dtbo

backup-extlinux:
	sudo cp /boot/extlinux/extlinux.conf /boot/extlinux/extlinux.conf.backup.$(shell date +%Y%m%d_%H%M%S)

restore:
	@if [ -f /boot/extlinux/extlinux.conf.backup ]; then \
		sudo cp /boot/extlinux/extlinux.conf.backup /boot/extlinux/extlinux.conf; \
		echo "extlinux.conf restored from backup."; \
	else \
		echo "No backup file found."; \
	fi

show-config:
	@echo "Current configuration:"
	@echo "DEFAULT_LABEL: $(DEFAULT_LABEL)"
	@echo "CURRENT_OVERLAY: $(OVERLAY)"
	@grep "^LABEL $(DEFAULT_LABEL)" -A6 /boot/extlinux/extlinux.conf