Add initial support for building RPI2 images.

In release.sh, allow overriding buildenv_setup() before
the handoff to arm/release.sh.

Copy arm/RPI-B.conf -> arm/RPI2.conf, set UBOOT_PORT and
the correct KERNEL, and add the buildenv_setup() override
to install the sysutils/u-boot-rpi2 port/package.

Copy tools/arm/crochet-RPI-B.conf -> tools/arm/crochet-RPI2.conf,
and set the correct entries for the RaspberryPi2 board.

Thanks to:	loos@
Sponsored by:	The FreeBSD Foundation

release/arm/RPI2.conf

@@ -0,0 +1,53 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+
+# Global variables.
+export SVNROOT="svn://svn.FreeBSD.org/"
+export SRCBRANCH="base/head@rHEAD"
+export DOCBRANCH="doc/head@rHEAD"
+export PORTBRANCH="ports/head@rHEAD"
+export NODOC=yes
+export WORLD_FLAGS="-j $(sysctl -n hw.ncpu)"
+export KERNEL_FLAGS="-j $(( $(( $(sysctl -n hw.ncpu) + 1 )) / 2 ))"
+export CHROOTDIR="/scratch"
+export EMBEDDEDBUILD=1
+export UBOOT_PORT="sysutils/u-boot-rpi2"
+
+# Build chroot configuration
+load_chroot_env() {
+	# Avoid collision with TARGET and XDEV.
+	unset XDEV XDEV_ARCH KERNEL
+	export TARGET="amd64"
+	export TARGET_ARCH="amd64"
+}
+
+# Build target configuration
+load_target_env() {
+	# Avoid collision with TARGET and XDEV.
+	unset TARGET TARGET_ARCH
+	export XDEV="arm"
+	export XDEV_ARCH="armv6"
+	export XDEV_FLAGS="WITH_GCC=1 WITH_GCC_BOOTSTRAP=1 WITHOUT_CLANG_IS_CC=1"
+	export XDEV_FLAGS="${XDEV_FLAGS} MK_TESTS=no"
+	export KERNEL="RPI2"
+	export CROCHETSRC="https://github.com/freebsd/crochet"
+	export CROCHETBRANCH="trunk@rHEAD"
+}
+
+# Build environment setup
+buildenv_setup() {
+	if [ ! -d ${CHROOTDIR}/usr/ports/${UBOOT_PORT} ]; then
+		chroot ${CHROOTDIR} env ASSUME_ALWAYS_YES=yes \
+			/usr/sbin/pkg bootstrap -y
+		chroot ${CHROOTDIR} env ASSUME_ALWAYS_YES=yes \
+			/usr/sbin/pkg install -y ${UBOOT_PORT}
+	else
+		chroot ${CHROOTDIR} env BATCH=1 \
+			make -C /usr/ports/${UBOOT_PORT} \
+			all install clean
+	fi
+	return 0
+}
+

release/release.sh

@@ -238,6 +238,7 @@ fi
 
 # Embedded builds do not use the 'make release' target.
 if [ -n "${EMBEDDEDBUILD}" ]; then
+	buildenv_setup
 	# If a crochet configuration file exists in *this* checkout of
 	# release/, copy it to the /tmp/external directory within the chroot.
 	# This allows building embedded releases without relying on updated

release/tools/arm/crochet-RPI2.conf

@@ -0,0 +1,29 @@
+#
+# $FreeBSD$
+#
+
+# This is the configuration file for use with crochet to produce
+# FreeBSD Raspberry Pi 2 images.
+
+board_setup RaspberryPi2
+option ImageSize 1gb
+option Growfs
+
+export MAKEOBJDIRPREFIX=/usr/obj
+FREEBSD_SRC=/usr/src
+__MAKE_CONF=/dev/null
+SRCCONF=/dev/null
+WORKDIR=/usr/obj
+_BRANCH=$(make -C ${FREEBSD_SRC}/release -V BRANCH)
+_REVISION=$(make -C ${FREEBSD_SRC}/release -V REVISION)
+KERNCONF=RPI2
+TARGET=arm
+TARGET_ARCH=armv6
+FREEBSD_BUILDWORLD_EXTRA_ARGS="${WORLD_FLAGS}"
+FREEBSD_BUILDKERNEL_EXTRA_ARGS="${KERNEL_FLAGS}"
+FREEBSD_INSTALLWORLD_EXTRA_ARGS=""
+FREEBSD_INSTALLKERNEL_EXTRA_ARGS=""
+FREEBSD_WORLD_EXTRA_ARGS=""
+FREEBSD_KERNEL_EXTRA_ARGS=""
+FREEBSD_EXTRA_ARGS=""
+IMG=${WORKDIR}/FreeBSD-${_REVISION}-${_BRANCH}-${TARGET}-${TARGET_ARCH}-${KERNCONF}.img