Some changes to be able to build an armel-based rootfs.

src/scripts/customize_rootfs.sh

 #!/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 customize the root file system after packages have been installed.
 #
 # NOTE: This script should be called by build_image.sh. Do not run this
 # on your own unless you know what you are doing.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Script must be run inside the chroot
 assert_inside_chroot
 
 # Flags
-DEFINE_string target "x86" \
+DEFINE_string arch "x86" \
   "The target architecture to build for. One of { x86, arm }."
 DEFINE_string root ""      \
   "The root file system to customize."
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 # Die on any errors.
 set -e
@@ skipping 106 matching lines @@
 # make a mountpoint for stateful partition
 sudo mkdir -p "$ROOT_FS_DIR"/mnt/stateful_partition
 sudo chmod 0755 "$ROOT_FS_DIR"/mnt
 sudo chmod 0755 "$ROOT_FS_DIR"/mnt/stateful_partition
 
 # Copy everything from the rootfs_static_data directory to the corresponding
 # place on the filesystem. Note that this step has to occur after we've
 # installed all of the packages.
 TMP_STATIC=$(mktemp -d)
 sudo cp -r "${SRC_ROOT}/rootfs_static_data/common/." "$TMP_STATIC"
-# TODO: Copy additional target-platform-specific subdirectories.
+# TODO: Copy additional arch-platform-specific subdirectories.
 sudo chmod -R a+rX "$TMP_STATIC/."
 sudo cp -r "$TMP_STATIC/." "$ROOT_FS_DIR"
 sudo rm -rf "$TMP_STATIC"
 
 # Fix issue where alsa-base (dependency of alsa-utils) is messing up our sound
 # drivers. The stock modprobe settings worked fine.
 # TODO: Revisit when we have decided on how sound will work on chromeos.
 ! sudo rm "${ROOT_FS_DIR}/etc/modprobe.d/alsa-base.conf"
 
 # Remove unneeded fonts.
@@ skipping 95 matching lines @@
 cat <<EOF | sudo dd of="${ROOT_FS_DIR}/etc/network/interfaces"
 auto lo
 iface lo inet loopback
 EOF
 
 cat <<EOF | sudo dd of="${ROOT_FS_DIR}/etc/resolv.conf"
 # Use the connman dns proxy.
 nameserver 127.0.0.1
 EOF
 sudo chmod a-wx "${ROOT_FS_DIR}/etc/resolv.conf"