Add infrastructure for building dtb files from linux kernel sources.

sysutils/dtc/linux-distinfo

@@ -0,0 +1,6 @@
+$NetBSD: linux-distinfo,v 1.1 2017/05/25 21:39:57 jmcneill Exp $
+
+SHA1 (linux-4.11.3.tar.xz) = 75102241132b57fa4e9afcfe8d3a34a500073e1d
+RMD160 (linux-4.11.3.tar.xz) = d1449446ee25e9060390bcaa985c7fff41bc1777
+SHA512 (linux-4.11.3.tar.xz) = 835e65968059c2964ea6dd4239e48d44a21565ff112d63d864b032d947d50f6f4aa8af73852a58ddf1d80c763375adcf9663d8bc4da5155f96f85bfb5a25e606
+Size (linux-4.11.3.tar.xz) = 95543348 bytes

sysutils/dtc/linux-dtb.mk

@@ -0,0 +1,43 @@
+# $NetBSD: linux-dtb.mk,v 1.1 2017/05/25 21:39:57 jmcneill Exp $
+
+LK_VERSION=	4.11.3
+PKGNAME=	dtb-${DTB_ARCH}-${DTB_DEVICE}-${LK_VERSION}
+DISTNAME=	linux-${LK_VERSION}
+CATEGORIES=	sysutils
+MASTER_SITES=	https://cdn.kernel.org/pub/linux/kernel/v4.x/
+EXTRACT_SUFX=	.tar.xz
+EXTRACT_ELEMENTS= \
+		linux-${LK_VERSION}/arch/${DTB_ARCH}/boot/dts \
+		linux-${LK_VERSION}/include
+
+MAINTAINER=	pkgsrc-users@NetBSD.org
+HOMEPAGE=	https://www.kernel.org/
+COMMENT=	DTB files for ${DTB_ARCH} ${DTB_DEVICE} based boards
+LICENSE=	gnu-gpl-v2
+
+DISTINFO_FILE=	${.CURDIR}/../../sysutils/dtc/linux-distinfo
+
+GENERATE_PLIST=	cd ${DESTDIR}${PREFIX};
+GENERATE_PLIST+=${FIND} * -type f | ${SORT};
+
+DTC=		${LOCALBASE}/bin/dtc
+DTS_DIR=	${WRKSRC}/arch/${DTB_ARCH}/boot/dts
+DTS_INC=	${WRKSRC}/include
+DTS_ARCH_INC=	${DTS_DIR}/include
+
+do-build:
+.for d in ${DTB_DTS}
+	${CPP} -P -x assembler-with-cpp -I ${DTS_INC} -I ${DTS_ARCH_INC} \
+	    -include ${DTS_DIR}/${d} /dev/null | \
+	    ${DTC} -i ${DTS_INC} -i ${DTS_ARCH_INC} -I dts -O dtb \
+	        -p 1024 -b 0 -o ${DTS_DIR}/${d:C/dts$/dtb/}
+.endfor
+
+do-install:
+.for d in ${DTB_DTS}
+	${INSTALL_DATA_DIR} ${DESTDIR}${PREFIX}/share/dtb/${DTB_ARCH}
+	${INSTALL_DATA} ${DTS_DIR}/${d:C/dts$/dtb/} \
+	    ${DESTDIR}${PREFIX}/share/dtb/${DTB_ARCH}
+.endfor
+
+BUILD_DEPENDS+=	dtc>=1.4.2:../../sysutils/dtc