mkrootfs: put /boot/MLO at the head on beaglebone.

This file must be in the first sectors of the /boot FAT partition on the image.

mkrootfs.sh.in

@@ -218,7 +218,13 @@ fi
 
 tarball=void-${PLATFORM}-rootfs-$(date '+%Y%m%d').tar.xz
 
-run_cmd "tar cp -C $rootfs . | $XZ -9 > $tarball"
+if [ "$PLATFORM" = "beaglebone" ]; then
+    # On Beaglebone make sure that boot/MLO is at the head.
+    run_cmd "tar -cp --posix -C $rootfs ./boot/MLO . | $XZ -9 > $tarball"
+else
+    run_cmd "tar -cp --posix -C $rootfs . | $XZ -9 > $tarball "
+fi
+
 rm -rf $rootfs
 
 info_msg "Successfully created $tarball ($PLATFORM)"