Added support for boards with only private overlays.

chromeos/scripts/setup_board

 #!/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.
 
 # This script sets up a the sysroot for a particular target board.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 94 matching lines @@
 for overlay in ${BOARD_OVERLAY_LIST} ; do
   if [ -f "${overlay}/make.conf" ]; then
     BOARD_MAKE_CONF_LIST="${BOARD_MAKE_CONF_LIST} ${overlay}/make.conf"
   fi
 done
 
 #
 # Check if there are any board overlays.  There should be at least a top
 # level board specific overlay.
 #
-PRIMARY_BOARD_OVERLAY="${SRC_ROOT}/overlays/overlay-${BOARD}"
+PRIMARY_BOARD_OVERLAY=$($SCRIPTS_DIR/bin/cros_overlay_list \
+  --board "$BOARD" \
+  --primary_only)
 
-if [ ! -d "${PRIMARY_BOARD_OVERLAY}" ]; then
-  warn "No board overlay found. [${PRIMARY_BOARD_OVERLAY}]"
-else
-  #
-  # Link make.conf.board to the board overlay's make.conf.  It must exist.
-  #
-  BOARD_MAKE_CONF="${PRIMARY_BOARD_OVERLAY}/make.conf"
-
-  if [ ! -f "${BOARD_MAKE_CONF}" ]; then
-    error "No board make.conf found. [${BOARD_MAKE_CONF}]"
-    exit 1
-  fi
-
-  #
-  # Fetch the toolchain from the board overlay.
-  #
-  BOARD_TOOL_CHAIN="${PRIMARY_BOARD_OVERLAY}/toolchain.conf"
-
-  if [ ! -f "${BOARD_TOOL_CHAIN}" ]; then
-    error "No board toolchain.conf found. [${BOARD_TOOL_CHAIN}]"
-    exit 1
-  fi
-
-  FLAGS_toolchain=${FLAGS_toolchain:-$(cat ${BOARD_TOOL_CHAIN})}
-fi
+#
+# Fetch the toolchain from the board overlay.
+#
+BOARD_TOOL_CHAIN="${PRIMARY_BOARD_OVERLAY}/toolchain.conf"
+FLAGS_toolchain=${FLAGS_toolchain:-$(cat ${BOARD_TOOL_CHAIN})}
 
 # Figure out ARCH from the given toolchain
 # TODO: Move to common.sh as a function after scripts are switched over.
 if [ -z "${FLAGS_toolchain}" ]; then
   error "No toolchain specified in board overlay or on command line."
   exit 1
 fi
 
 TC_ARCH=$(echo "$FLAGS_toolchain" | awk -F'-' '{ print $1 }')
 case "$TC_ARCH" in
@@ skipping 269 matching lines @@
   echo $BOARD_VARIANT > "$GCLIENT_ROOT/src/scripts/.default_board"
 fi
 
 echo "Done!"
 echo "You can use the following wrappers:"
 echo "  ${EMERGE_WRAPPER}"
 echo "  ${EBUILD_WRAPPER}"
 echo "  ${EQUERY_WRAPPER}"
 echo "  ${PORTAGEQ_WRAPPER}"
 echo "The SYSROOT is: ${BOARD_ROOT}"