build_image: enable syslinux installation for x86

build_image

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to build a bootable keyfob-based chromeos system image from within
 # a chromiumos setup. This assumes that all needed packages have been built into
 # the given target's root with binary packages turned on. This script will
 # build the Chrome OS image using only pre-built binary packages.
@@ skipping 308 matching lines @@
   # build because vmlinuz_hd.vblock hasn't been created by build_kernel_image.sh
   if [[ "${ARCH}" = "x86" ]]; then
     sudo cp "${OUTPUT_DIR}/vmlinuz_hd.vblock" "${STATEFUL_FS_DIR}"
   fi
 
   # START_KERN_A is set by the first call to install the gpt.
   local koffset="$(partoffset ${OUTPUT_DIR}/${image_name} 2)"
   sudo dd if="${OUTPUT_DIR}/vmlinuz.image" of="${OUTPUT_DIR}/${image_name}" \
     conv=notrunc bs=512 seek=${koffset}
 
-  # Populate the legacy/efi bootloader partition.
+  # Update the bootloaders.  For legacy/efi x86, the EFI system partition
+  # will be updated and for arm, the mbr will be updated (for u-boot).
   local kernel_part="--kernel_partition='${OUTPUT_DIR}/vmlinuz.image'"
+  kernel_part="${kernel_part} --install_syslinux"
   local bootloader_to="${ESP_FS_IMG}"
   local usb_disk="${FLAGS_usb_disk}"
   local bootloader_to="$(mount | grep ${ESP_FS_DIR} | cut -f1 -d' ')"
   if [[ "${ARCH}" == "arm" ]]; then
     # TODO(wad) mmcblk1p3 is hardcoded for arm for now!
     usb_disk="/dev/mmcblk1p3"
     kernel_part="--kernel_cmdline=\"${FLAGS_arm_extra_bootargs}\" "
     # TODO(wad) Integrate dmtable extraction into the arm build
     # E.g.  $(cat ${OUTPUT_DIR}/boot.config | tr -s '\n' ' ')"
     local kpart_offset="--kernel_partition_offset=${koffset}"
@@ skipping 356 matching lines @@
   echo "Developer image created as ${DEVELOPER_IMAGE_NAME}"
 fi
 
 print_time_elapsed
 
 echo "To copy to USB keyfob, OUTSIDE the chroot, do something like:"
 echo "  ./image_to_usb.sh --from=${OUTSIDE_OUTPUT_DIR} --to=/dev/sdX"
 echo "To convert to VMWare image, OUTSIDE the chroot, do something like:"
 echo "  ./image_to_vmware.sh --from=${OUTSIDE_OUTPUT_DIR}"
 echo "from the scripts directory where you entered the chroot."