Add initial support for building arm BEAGLEBONE images.

- In arm/release.sh:
   - Move crochet work directory creation to occur earlier,
     since its parent directory is needed to store a fetched
     u-boot version.

   - Add a before_build() function as a quick hack to run
     board-specific (kernel configuration specific, really)
     commands, if any.

   - For the BEAGLEBONE kernel, a specific version of u-boot
     source is needed.  Fetch the source in before_build() for
     this case.  Unfortunately, there are no checksums available
     (that I can find) for these sources.  For a quick solution,
     add the hard-coded sha256 of the tarball, and fetch from
     my public_html/ directory.  A more permanent solution for
     this needs to be found.

Add initial release.sh and crochet configuration files for the
BEAGLEBONE build.

Sponsored by:	The FreeBSD Foundation

release/arm/BEAGLEBONE.conf

@@ -0,0 +1,36 @@
+#
+# $FreeBSD$
+#
+
+# This is only supported on amd64 right now.  It may work on
+# i386, but I do not have the hardware to test, so until I get
+# a VM set up to make sure, be cautious and assume it will not.
+if [ "$(uname -p)" != "amd64" ] || [ "$(uname -m)" != "amd64" ]; then
+    echo "This is only supported on amd64 right now."
+    exit 0
+fi
+
+# Build chroot configuration
+TARGET="amd64"
+TARGET_ARCH="amd64"
+SVNROOT="svn://svn.FreeBSD.org"
+SRCBRANCH="base/head@rHEAD"
+DOCBRANCH="doc/head@rHEAD"
+PORTBRANCH="ports/head@rHEAD"
+EMBEDDED_WORLD_FLAGS="WITH_GCC=1"
+NODOC=yes
+
+# Build target configuration
+# Since this file is sourced by a script that runs another
+# script, these must be exported.
+set -a
+CHROOTDIR="/scratch"
+EMBEDDEDBUILD=1
+EMBEDDEDPORTS="lang/python textproc/gsed"
+XDEV="arm"
+XDEV_ARCH="arm"
+KERNEL="BEAGLEBONE"
+CROCHETSRC="https://github.com/kientzle/crochet-freebsd"
+CROCHETBRANCH="trunk"
+set +a
+

release/arm/release.sh

@@ -10,6 +10,26 @@
 
 set -e
 
+before_build() {
+	case ${KERNEL} in
+		BEAGLEBONE)
+			KNOWNHASH="4150e5a4480707c55a8d5b4570262e43af68d8ed3bdc0a433d8e7df47989a69e"
+			chroot ${CHROOTDIR} fetch -o /tmp/crochet/u-boot-2013.04.tar.bz2 \
+				http://people.freebsd.org/~gjb/u-boot-2013.04.tar.bz2
+			UBOOT_HASH="$(sha256 -q ${CHROOTDIR}/tmp/crochet/u-boot-2013.04.tar.bz2)"
+			if [ "${UBOOT_HASH}" != "${KNOWNHASH}" ]; then
+				echo "Checksum mismatch!  Exiting now."
+				exit 1
+			fi
+			chroot ${CHROOTDIR} tar xf /tmp/crochet/u-boot-2013.04.tar.bz2 \
+				-C /tmp/crochet/ 
+			;;
+		*)
+			# Fallthrough.
+			;;
+	esac
+}
+
 install_crochet() {
 	chroot ${CHROOTDIR} svn co -q ${CROCHETSRC}/${CROCHETBRANCH} \
 		/tmp/crochet
@@ -46,9 +66,10 @@ main() {
 			BATCH=1 FORCE_PKG_REGISTER=1 install clean distclean
 	done
 
+	mkdir -p ${CHROOTDIR}/tmp/crochet/work
+	before_build
 	install_crochet
 	install_uboot
-	mkdir -p ${CHROOTDIR}/tmp/crochet/work
 	eval chroot ${CHROOTDIR} /bin/sh /tmp/crochet/crochet.sh \
 		-c /tmp/external/${XDEV}/crochet-${KERNEL}.conf
 }

release/tools/arm/crochet-BEAGLEBONE.conf

@@ -0,0 +1,27 @@
+#
+# $FreeBSD$
+#
+
+# This is the configuration file for use with crochet to produce
+# FreeBSD BeagleBone images.
+
+board_setup BeagleBone
+option ImageSize 1gb
+option AutoSize
+
+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 ${FREEBSD_SRC}/release -V REVISION)
+KERNCONF=BEAGLEBONE
+FREEBSD_BUILDWORLD_EXTRA_ARGS=""
+FREEBSD_INSTALLWORLD_EXTRA_ARGS=""
+FREEBSD_BUILDKERNEL_EXTRA_ARGS=""
+FREEBSD_INSTALLKERNEL_EXTRA_ARGS=""
+FREEBSD_WORLD_EXTRA_ARGS=""
+FREEBSD_KERNEL_EXTRA_ARGS=""
+FREEBSD_EXTRA_ARGS=""
+IMG=${WORKDIR}/FreeBSD-${_REVISION}-${_BRANCH}-${KERNCONF}.img