make_image: Install u-boot scripts to ESP partition.

update_bootloaders.sh

 #!/bin/bash
 
 # Copyright (c) 2010 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.
 
 # Helper script that generates the legacy/efi bootloader partitions.
 # It does not populate the templates, but can update a loop device.
 
 . "$(dirname "$0")/common.sh"
@@ skipping 188 matching lines @@
   fi
   # TODO(wad) assume usb_disk contains the arm boot location for now.
   new_root="${FLAGS_usb_disk}"
   info "Replacing dm slave devices with /dev/${new_root}"
   dm_table="${dm_table//ROOT_DEV/\/dev\/${new_root}}"
   dm_table="${dm_table//HASH_DEV/\/dev\/${new_root}}"
 
   warn "FIXME: cannot replace root= here for the arm bootloader yet."
   dm_table=""  # TODO(wad) Clear it until we can fix root=/dev/dm-0
 
-  device=1
-  MBR_SCRIPT_UIMG=$(make_arm_mbr \
-    ${FLAGS_kernel_partition_offset} \
-    ${FLAGS_kernel_partition_sectors} \
-    ${device} \
-    "'dm=\"${dm_table}\"'")
-  sudo dd bs=1 count=`stat --printf="%s" ${MBR_SCRIPT_UIMG}` \
-     if="$MBR_SCRIPT_UIMG" of=${FLAGS_to}
-  info "Emitted new ARM MBR to ${FLAGS_to}"
+  # Copy u-boot script to ESP partition
+  sudo mkdir -p "${ESP_FS_DIR}/u-boot"
+  sudo cp "${FLAGS_from}/boot-A.scr.uimg" "${ESP_FS_DIR}/u-boot/boot.scr.uimg"
 fi
 
 set +e