fix autotest scripts for board variants

src/scripts/build_autotest.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.
 
 # This script makes autotest client tests inside a chroot environment.  The idea
 # is to compile any platform-dependent autotest client tests in the build
 # environment, since client systems under test lack the proper toolchain.
 #
@@ skipping 34 matching lines @@
 CLIENT_TEST_PATH="../third_party/autotest/files/client/site_tests"
 for SITE_TEST in ${CLIENT_TEST_PATH}/*
 do
   if [ -d ${SITE_TEST} ]
   then
     ALL_TESTS="${ALL_TESTS},${SITE_TEST##${CLIENT_TEST_PATH}/}"
   fi
 done
 
 # Load the overlay specific blacklist and remove any matching tests.
-PRIMARY_BOARD_OVERLAY="${SRC_ROOT}/overlays/overlay-${FLAGS_board}"
+BOARD_BASENAME=$(echo "${FLAGS_board}" |cut -d '_' -f 1)
+PRIMARY_BOARD_OVERLAY="${SRC_ROOT}/overlays/overlay-${BOARD_BASENAME}"
 BLACKLIST_FILE="${PRIMARY_BOARD_OVERLAY}/autotest-blacklist"
 if [ -r "${BLACKLIST_FILE}" ]
 then
   BLACKLISTED_TESTS=$(cat ${BLACKLIST_FILE})
 
   for TEST in ${BLACKLISTED_TESTS}
   do
     ALL_TESTS=${ALL_TESTS/#${TEST},/}     # match first test (test,...)
     ALL_TESTS=${ALL_TESTS/,${TEST},/,}    # match middle tests (...,test,...)
     ALL_TESTS=${ALL_TESTS/%,${TEST}/}     # match last test (...,test)
@@ skipping 22 matching lines @@
 fi
 
 # Decide on USE flags based on options
 USE=
 [ $FLAGS_autox -eq "$FLAGS_FALSE" ] && USE="${USE} -autox"
 [ $FLAGS_buildcheck -eq "$FLAGS_TRUE" ] && USE="${USE} buildcheck"
 
 GCLIENT_ROOT="${GCLIENT_ROOT}" TEST_LIST=${TEST_LIST} \
   FEATURES="${FEATURES} -buildpkg" USE="$USE" "emerge-${FLAGS_board}" \
   chromeos-base/autotest ${EMERGE_JOBS}