armh: added umkimage support

It was actually done much earlier during an experiment with
Marvell ArmadaXP but is now integrated more or less properly.

NB: ext2 is not needed anymore (uboot should do it),
ext4 should become configurable by an existing knob.

features.in/armh/rootfs/image-scripts.d/50-initrd

@@ -14,8 +14,35 @@ kver="$(rpm -qa 'kernel-image*' \
 #     for TWRP based ARM "VE" chroots (e.g. for nexus7);
 #     should be implemented in make-initrd either
 
+### rootfs type should become configurable
 if rpm -q mkinitrd; then
 	mkinitrd --with ext4 -f /boot/initrd-$kver.img "$kver"
 fi
 
+# NB: if the adresses ever become different this "API" _will_ change
+# NB: initrd compression (-C) might change, armadaxp handles gzip
+umk() {
+	[ $# = 4 ] || exit 1
+	cd /boot
+	umkimage \
+		-A arm \
+		-O linux \
+		-T "$1" \
+		-C none \
+		-a "$2" \
+		-e "$2" \
+		-n "`readlink "$3"`" \
+		-d "$3" \
+		"$4"
+}
+
+### the addresses will become variables some day probably
+if rpm -q uboot-tools; then
+	umk kernel 0x00008000 vmlinuz uimage
+	umk ramdisk 0x00800000 initrd.img uinitrd
+	if [ -s boot ]; then
+		umk script 0 boot boot.scr
+	fi
+fi
+
 :