compile either all device tree source files of a given target or for all targets: ~/compile_all_dts.sh

compile_all_dts.sh

#!/bin/bash

TARGET="*"
WITHPREPARE=1

# compile a target and copy the directory build_dir/target-*/linux-*/linux-4.4.30/scripts/dtc/
# to your LEDE base directory
DTC=./dtc/dtc

for i in "$@"; do
	case $i in
		--without-prepare)
			WITHPREPARE=0
			shift
			;;
		*)
			TARGET="${i}"
		;;
	esac
done

for MAKEFILE in target/linux/${TARGET}/Makefile
do
	DTSDIR=$(find "$(dirname "${MAKEFILE}")" -type d -name dts)
	[ -z "${DTSDIR}" ] && continue

	TARGET=$(grep -m1 'BOARD:=' "${MAKEFILE}")
	TARGET=${TARGET#BOARD:=}
	SUBTARGETS=$(grep -m1 'SUBTARGETS:=' "${MAKEFILE}")
	SUBTARGETS=(${SUBTARGETS#SUBTARGETS:=})
	SUBTARGET=${SUBTARGETS[0]}

	TARGET_SUBTARGET="${TARGET}"
	[ -n "${SUBTARGET}" ] && TARGET_SUBTARGET="${TARGET_SUBTARGET}_${SUBTARGET}"

	echo "${TARGET}"

	[ "${WITHPREPARE}" -eq 1 ] && {
		echo "CONFIG_TARGET_${TARGET}=y" > .config
		[ -n "${SUBTARGET}" ] && echo "CONFIG_TARGET_${TARGET_SUBTARGET}=y" >> .config

		make defconfig > /dev/null
		make target/linux/{clean,prepare} > /dev/null
	}

	ARCH=$(grep -m1 'ARCH:=' "${MAKEFILE}")
	ARCH=${ARCH#ARCH:=}
	[ -z "${ARCH}" ] && ARCH=${TARGET}

	KERNELVER=$(grep -m1 'KERNEL_PATCHVER:=' "${MAKEFILE}")
	KERNELVER=${KERNELVER#KERNEL_PATCHVER:=}

	LINUXDIR=$(ls -d build_dir/target-*/linux-"${TARGET_SUBTARGET}"/linux-"${KERNELVER}"*)

	for DTSFILE in ${DTSDIR}/*.dts
	do
		OUTPUTFILE=$(basename "${DTSFILE}")
		OUTPUTFILE="${OUTPUTFILE%.*}"

		cpp -nostdinc -x assembler-with-cpp -I"${LINUXDIR}/include" -I"${LINUXDIR}/arch/${ARCH}/boot/dts" -undef -D__DTS__ -o "${OUTPUTFILE}.dts" "${DTSFILE}" || continue

		OUTPUT="$(${DTC} -O dtb -I dts "${OUTPUTFILE}.dts" -o "${OUTPUTFILE}.dtb" 2>&1)"
		[ -n "${OUTPUT}" ] && {
			echo "${DTSFILE}"
			echo "${OUTPUT}"
		}
	done
done