diff --git a/tools/genboardscfg.py b/tools/genboardscfg.py
index e6870f5..654100b 100755
--- a/tools/genboardscfg.py
+++ b/tools/genboardscfg.py
@@ -6,34 +6,33 @@
 #
 
 """
-Converter from Kconfig and MAINTAINERS to boards.cfg
+Converter from Kconfig and MAINTAINERS to a board database.
 
-Run 'tools/genboardscfg.py' to create boards.cfg file.
+Run 'tools/genboardscfg.py' to create a board database.
 
 Run 'tools/genboardscfg.py -h' for available options.
 
-This script only works on python 2.6 or later, but not python 3.x.
+Python 2.6 or later, but not Python 3.x is necessary to run this script.
 """
 
 import errno
 import fnmatch
 import glob
+import multiprocessing
 import optparse
 import os
-import re
-import shutil
 import subprocess
 import sys
 import tempfile
 import time
 
-BOARD_FILE = 'boards.cfg'
-CONFIG_DIR = 'configs'
-REFORMAT_CMD = [os.path.join('tools', 'reformat.py'),
-                '-i', '-d', '-', '-s', '8']
-SHOW_GNU_MAKE = 'scripts/show-gnu-make'
-SLEEP_TIME=0.003
+sys.path.append(os.path.join(os.path.dirname(__file__), 'buildman'))
+import kconfiglib
 
+### constant variables ###
+OUTPUT_FILE = 'boards.cfg'
+CONFIG_DIR = 'configs'
+SLEEP_TIME = 0.03
 COMMENT_BLOCK = '''#
 # List of boards
 #   Automatically generated by %s: don't edit
@@ -43,35 +42,14 @@
 ''' % __file__
 
 ### helper functions ###
-def get_terminal_columns():
-    """Get the width of the terminal.
-
-    Returns:
-      The width of the terminal, or zero if the stdout is not
-      associated with tty.
-    """
+def try_remove(f):
+    """Remove a file ignoring 'No such file or directory' error."""
     try:
-        return shutil.get_terminal_size().columns # Python 3.3~
-    except AttributeError:
-        import fcntl
-        import termios
-        import struct
-        arg = struct.pack('hhhh', 0, 0, 0, 0)
-        try:
-            ret = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, arg)
-        except IOError as exception:
-            # If 'Inappropriate ioctl for device' error occurs,
-            # stdout is probably redirected. Return 0.
-            return 0
-        return struct.unpack('hhhh', ret)[1]
-
-def get_devnull():
-    """Get the file object of '/dev/null' device."""
-    try:
-        devnull = subprocess.DEVNULL # py3k
-    except AttributeError:
-        devnull = open(os.devnull, 'wb')
-    return devnull
+        os.remove(f)
+    except OSError as exception:
+        # Ignore 'No such file or directory' error
+        if exception.errno != errno.ENOENT:
+            raise
 
 def check_top_directory():
     """Exit if we are not at the top of source directory."""
@@ -79,23 +57,15 @@
         if not os.path.exists(f):
             sys.exit('Please run at the top of source directory.')
 
-def get_make_cmd():
-    """Get the command name of GNU Make."""
-    process = subprocess.Popen([SHOW_GNU_MAKE], stdout=subprocess.PIPE)
-    ret = process.communicate()
-    if process.returncode:
-        sys.exit('GNU Make not found')
-    return ret[0].rstrip()
-
-def output_is_new():
-    """Check if the boards.cfg file is up to date.
+def output_is_new(output):
+    """Check if the output file is up to date.
 
     Returns:
-      True if the boards.cfg file exists and is newer than any of
+      True if the given output file exists and is newer than any of
       *_defconfig, MAINTAINERS and Kconfig*.  False otherwise.
     """
     try:
-        ctime = os.path.getctime(BOARD_FILE)
+        ctime = os.path.getctime(output)
     except OSError as exception:
         if exception.errno == errno.ENOENT:
             # return False on 'No such file or directory' error
@@ -121,9 +91,9 @@
             if ctime < os.path.getctime(filepath):
                 return False
 
-    # Detect a board that has been removed since the current boards.cfg
+    # Detect a board that has been removed since the current board database
     # was generated
-    with open(BOARD_FILE) as f:
+    with open(output) as f:
         for line in f:
             if line[0] == '#' or line == '\n':
                 continue
@@ -134,6 +104,172 @@
     return True
 
 ### classes ###
+class KconfigScanner:
+
+    """Kconfig scanner."""
+
+    ### constant variable only used in this class ###
+    _SYMBOL_TABLE = {
+        'arch' : 'SYS_ARCH',
+        'cpu' : 'SYS_CPU',
+        'soc' : 'SYS_SOC',
+        'vendor' : 'SYS_VENDOR',
+        'board' : 'SYS_BOARD',
+        'config' : 'SYS_CONFIG_NAME',
+        'options' : 'SYS_EXTRA_OPTIONS'
+    }
+
+    def __init__(self):
+        """Scan all the Kconfig files and create a Config object."""
+        # Define environment variables referenced from Kconfig
+        os.environ['srctree'] = os.getcwd()
+        os.environ['UBOOTVERSION'] = 'dummy'
+        os.environ['KCONFIG_OBJDIR'] = ''
+        self._conf = kconfiglib.Config()
+
+    def __del__(self):
+        """Delete a leftover temporary file before exit.
+
+        The scan() method of this class creates a temporay file and deletes
+        it on success.  If scan() method throws an exception on the way,
+        the temporary file might be left over.  In that case, it should be
+        deleted in this destructor.
+        """
+        if hasattr(self, '_tmpfile') and self._tmpfile:
+            try_remove(self._tmpfile)
+
+    def scan(self, defconfig):
+        """Load a defconfig file to obtain board parameters.
+
+        Arguments:
+          defconfig: path to the defconfig file to be processed
+
+        Returns:
+          A dictionary of board parameters.  It has a form of:
+          {
+              'arch': <arch_name>,
+              'cpu': <cpu_name>,
+              'soc': <soc_name>,
+              'vendor': <vendor_name>,
+              'board': <board_name>,
+              'target': <target_name>,
+              'config': <config_header_name>,
+              'options': <extra_options>
+          }
+        """
+        # strip special prefixes and save it in a temporary file
+        fd, self._tmpfile = tempfile.mkstemp()
+        with os.fdopen(fd, 'w') as f:
+            for line in open(defconfig):
+                colon = line.find(':CONFIG_')
+                if colon == -1:
+                    f.write(line)
+                else:
+                    f.write(line[colon + 1:])
+
+        self._conf.load_config(self._tmpfile)
+
+        try_remove(self._tmpfile)
+        self._tmpfile = None
+
+        params = {}
+
+        # Get the value of CONFIG_SYS_ARCH, CONFIG_SYS_CPU, ... etc.
+        # Set '-' if the value is empty.
+        for key, symbol in self._SYMBOL_TABLE.items():
+            value = self._conf.get_symbol(symbol).get_value()
+            if value:
+                params[key] = value
+            else:
+                params[key] = '-'
+
+        defconfig = os.path.basename(defconfig)
+        params['target'], match, rear = defconfig.partition('_defconfig')
+        assert match and not rear, '%s : invalid defconfig' % defconfig
+
+        # fix-up for aarch64
+        if params['arch'] == 'arm' and params['cpu'] == 'armv8':
+            params['arch'] = 'aarch64'
+
+        # fix-up options field. It should have the form:
+        # <config name>[:comma separated config options]
+        if params['options'] != '-':
+            params['options'] = params['config'] + ':' + \
+                                params['options'].replace(r'\"', '"')
+        elif params['config'] != params['target']:
+            params['options'] = params['config']
+
+        return params
+
+def scan_defconfigs_for_multiprocess(queue, defconfigs):
+    """Scan defconfig files and queue their board parameters
+
+    This function is intended to be passed to
+    multiprocessing.Process() constructor.
+
+    Arguments:
+      queue: An instance of multiprocessing.Queue().
+             The resulting board parameters are written into it.
+      defconfigs: A sequence of defconfig files to be scanned.
+    """
+    kconf_scanner = KconfigScanner()
+    for defconfig in defconfigs:
+        queue.put(kconf_scanner.scan(defconfig))
+
+def read_queues(queues, params_list):
+    """Read the queues and append the data to the paramers list"""
+    for q in queues:
+        while not q.empty():
+            params_list.append(q.get())
+
+def scan_defconfigs(jobs=1):
+    """Collect board parameters for all defconfig files.
+
+    This function invokes multiple processes for faster processing.
+
+    Arguments:
+      jobs: The number of jobs to run simultaneously
+    """
+    all_defconfigs = []
+    for (dirpath, dirnames, filenames) in os.walk(CONFIG_DIR):
+        for filename in fnmatch.filter(filenames, '*_defconfig'):
+            if fnmatch.fnmatch(filename, '.*'):
+                continue
+            all_defconfigs.append(os.path.join(dirpath, filename))
+
+    total_boards = len(all_defconfigs)
+    processes = []
+    queues = []
+    for i in range(jobs):
+        defconfigs = all_defconfigs[total_boards * i / jobs :
+                                    total_boards * (i + 1) / jobs]
+        q = multiprocessing.Queue(maxsize=-1)
+        p = multiprocessing.Process(target=scan_defconfigs_for_multiprocess,
+                                    args=(q, defconfigs))
+        p.start()
+        processes.append(p)
+        queues.append(q)
+
+    # The resulting data should be accumulated to this list
+    params_list = []
+
+    # Data in the queues should be retrieved preriodically.
+    # Otherwise, the queues would become full and subprocesses would get stuck.
+    while any([p.is_alive() for p in processes]):
+        read_queues(queues, params_list)
+        # sleep for a while until the queues are filled
+        time.sleep(SLEEP_TIME)
+
+    # Joining subprocesses just in case
+    # (All subprocesses should already have been finished)
+    for p in processes:
+        p.join()
+
+    # retrieve leftover data
+    read_queues(queues, params_list)
+
+    return params_list
+
 class MaintainersDatabase:
 
     """The database of board status and maintainers."""
@@ -145,8 +281,12 @@
     def get_status(self, target):
         """Return the status of the given board.
 
+        The board status is generally either 'Active' or 'Orphan'.
+        Display a warning message and return '-' if status information
+        is not found.
+
         Returns:
-          Either 'Active' or 'Orphan'
+          'Active', 'Orphan' or '-'.
         """
         if not target in self.database:
             print >> sys.stderr, "WARNING: no status info for '%s'" % target
@@ -165,8 +305,9 @@
     def get_maintainers(self, target):
         """Return the maintainers of the given board.
 
-        If the board has two or more maintainers, they are separated
-        with colons.
+        Returns:
+          Maintainers of the board.  If the board has two or more maintainers,
+          they are separated with colons.
         """
         if not target in self.database:
             print >> sys.stderr, "WARNING: no maintainers for '%s'" % target
@@ -175,10 +316,10 @@
         return ':'.join(self.database[target][1])
 
     def parse_file(self, file):
-        """Parse the given MAINTAINERS file.
+        """Parse a MAINTAINERS file.
 
-        This method parses MAINTAINERS and add board status and
-        maintainers information to the database.
+        Parse a MAINTAINERS file and accumulates board status and
+        maintainers information.
 
         Arguments:
           file: MAINTAINERS file to be parsed
@@ -210,414 +351,91 @@
             for target in targets:
                 self.database[target] = (status, maintainers)
 
-class DotConfigParser:
-
-    """A parser of .config file.
-
-    Each line of the output should have the form of:
-    Status, Arch, CPU, SoC, Vendor, Board, Target, Options, Maintainers
-    Most of them are extracted from .config file.
-    MAINTAINERS files are also consulted for Status and Maintainers fields.
-    """
-
-    re_arch = re.compile(r'CONFIG_SYS_ARCH="(.*)"')
-    re_cpu = re.compile(r'CONFIG_SYS_CPU="(.*)"')
-    re_soc = re.compile(r'CONFIG_SYS_SOC="(.*)"')
-    re_vendor = re.compile(r'CONFIG_SYS_VENDOR="(.*)"')
-    re_board = re.compile(r'CONFIG_SYS_BOARD="(.*)"')
-    re_config = re.compile(r'CONFIG_SYS_CONFIG_NAME="(.*)"')
-    re_options = re.compile(r'CONFIG_SYS_EXTRA_OPTIONS="(.*)"')
-    re_list = (('arch', re_arch), ('cpu', re_cpu), ('soc', re_soc),
-               ('vendor', re_vendor), ('board', re_board),
-               ('config', re_config), ('options', re_options))
-    must_fields = ('arch', 'config')
-
-    def __init__(self, build_dir, output, maintainers_database):
-        """Create a new .config perser.
-
-        Arguments:
-          build_dir: Build directory where .config is located
-          output: File object which the result is written to
-          maintainers_database: An instance of class MaintainersDatabase
-        """
-        self.dotconfig = os.path.join(build_dir, '.config')
-        self.output = output
-        self.database = maintainers_database
-
-    def parse(self, defconfig):
-        """Parse .config file and output one-line database for the given board.
-
-        Arguments:
-          defconfig: Board (defconfig) name
-        """
-        fields = {}
-        for line in open(self.dotconfig):
-            if not line.startswith('CONFIG_SYS_'):
-                continue
-            for (key, pattern) in self.re_list:
-                m = pattern.match(line)
-                if m and m.group(1):
-                    fields[key] = m.group(1)
-                    break
-
-        # sanity check of '.config' file
-        for field in self.must_fields:
-            if not field in fields:
-                print >> sys.stderr, (
-                    "WARNING: '%s' is not defined in '%s'. Skip." %
-                    (field, defconfig))
-                return
-
-        # fix-up for aarch64
-        if fields['arch'] == 'arm' and 'cpu' in fields:
-            if fields['cpu'] == 'armv8':
-                fields['arch'] = 'aarch64'
-
-        target, match, rear = defconfig.partition('_defconfig')
-        assert match and not rear, \
-                                '%s : invalid defconfig file name' % defconfig
-
-        fields['status'] = self.database.get_status(target)
-        fields['maintainers'] = self.database.get_maintainers(target)
-
-        if 'options' in fields:
-            options = fields['config'] + ':' + \
-                      fields['options'].replace(r'\"', '"')
-        elif fields['config'] != target:
-            options = fields['config']
-        else:
-            options = '-'
-
-        self.output.write((' '.join(['%s'] * 9) + '\n')  %
-                          (fields['status'],
-                           fields['arch'],
-                           fields.get('cpu', '-'),
-                           fields.get('soc', '-'),
-                           fields.get('vendor', '-'),
-                           fields.get('board', '-'),
-                           target,
-                           options,
-                           fields['maintainers']))
-
-class Slot:
-
-    """A slot to store a subprocess.
-
-    Each instance of this class handles one subprocess.
-    This class is useful to control multiple processes
-    for faster processing.
-    """
-
-    def __init__(self, output, maintainers_database, devnull, make_cmd):
-        """Create a new slot.
-
-        Arguments:
-          output: File object which the result is written to
-          maintainers_database: An instance of class MaintainersDatabase
-          devnull: file object of 'dev/null'
-          make_cmd: the command name of Make
-        """
-        self.build_dir = tempfile.mkdtemp()
-        self.devnull = devnull
-        self.ps = subprocess.Popen([make_cmd, 'O=' + self.build_dir,
-                                    'allnoconfig'], stdout=devnull)
-        self.occupied = True
-        self.parser = DotConfigParser(self.build_dir, output,
-                                      maintainers_database)
-        self.env = os.environ.copy()
-        self.env['srctree'] = os.getcwd()
-        self.env['UBOOTVERSION'] = 'dummy'
-        self.env['KCONFIG_OBJDIR'] = ''
-
-    def __del__(self):
-        """Delete the working directory"""
-        if not self.occupied:
-            while self.ps.poll() == None:
-                pass
-        shutil.rmtree(self.build_dir)
-
-    def add(self, defconfig):
-        """Add a new subprocess to the slot.
-
-        Fails if the slot is occupied, that is, the current subprocess
-        is still running.
-
-        Arguments:
-          defconfig: Board (defconfig) name
-
-        Returns:
-          Return True on success or False on fail
-        """
-        if self.occupied:
-            return False
-
-        with open(os.path.join(self.build_dir, '.tmp_defconfig'), 'w') as f:
-            for line in open(os.path.join(CONFIG_DIR, defconfig)):
-                colon = line.find(':CONFIG_')
-                if colon == -1:
-                    f.write(line)
-                else:
-                    f.write(line[colon + 1:])
-
-        self.ps = subprocess.Popen([os.path.join('scripts', 'kconfig', 'conf'),
-                                    '--defconfig=.tmp_defconfig', 'Kconfig'],
-                                   stdout=self.devnull,
-                                   cwd=self.build_dir,
-                                   env=self.env)
-
-        self.defconfig = defconfig
-        self.occupied = True
-        return True
-
-    def wait(self):
-        """Wait until the current subprocess finishes."""
-        while self.occupied and self.ps.poll() == None:
-            time.sleep(SLEEP_TIME)
-        self.occupied = False
-
-    def poll(self):
-        """Check if the subprocess is running and invoke the .config
-        parser if the subprocess is terminated.
-
-        Returns:
-          Return True if the subprocess is terminated, False otherwise
-        """
-        if not self.occupied:
-            return True
-        if self.ps.poll() == None:
-            return False
-        if self.ps.poll() == 0:
-            self.parser.parse(self.defconfig)
-        else:
-            print >> sys.stderr, ("WARNING: failed to process '%s'. skip." %
-                                  self.defconfig)
-        self.occupied = False
-        return True
-
-class Slots:
-
-    """Controller of the array of subprocess slots."""
-
-    def __init__(self, jobs, output, maintainers_database):
-        """Create a new slots controller.
-
-        Arguments:
-          jobs: A number of slots to instantiate
-          output: File object which the result is written to
-          maintainers_database: An instance of class MaintainersDatabase
-        """
-        self.slots = []
-        devnull = get_devnull()
-        make_cmd = get_make_cmd()
-        for i in range(jobs):
-            self.slots.append(Slot(output, maintainers_database,
-                                   devnull, make_cmd))
-        for slot in self.slots:
-            slot.wait()
-
-    def add(self, defconfig):
-        """Add a new subprocess if a vacant slot is available.
-
-        Arguments:
-          defconfig: Board (defconfig) name
-
-        Returns:
-          Return True on success or False on fail
-        """
-        for slot in self.slots:
-            if slot.add(defconfig):
-                return True
-        return False
-
-    def available(self):
-        """Check if there is a vacant slot.
-
-        Returns:
-          Return True if a vacant slot is found, False if all slots are full
-        """
-        for slot in self.slots:
-            if slot.poll():
-                return True
-        return False
-
-    def empty(self):
-        """Check if all slots are vacant.
-
-        Returns:
-          Return True if all slots are vacant, False if at least one slot
-          is running
-        """
-        ret = True
-        for slot in self.slots:
-            if not slot.poll():
-                ret = False
-        return ret
-
-class Indicator:
-
-    """A class to control the progress indicator."""
-
-    MIN_WIDTH = 15
-    MAX_WIDTH = 70
-
-    def __init__(self, total):
-        """Create an instance.
-
-        Arguments:
-          total: A number of boards
-        """
-        self.total = total
-        self.cur = 0
-        width = get_terminal_columns()
-        width = min(width, self.MAX_WIDTH)
-        width -= self.MIN_WIDTH
-        if width > 0:
-            self.enabled = True
-        else:
-            self.enabled = False
-        self.width = width
-
-    def inc(self):
-        """Increment the counter and show the progress bar."""
-        if not self.enabled:
-            return
-        self.cur += 1
-        arrow_len = self.width * self.cur // self.total
-        msg = '%4d/%d [' % (self.cur, self.total)
-        msg += '=' * arrow_len + '>' + ' ' * (self.width - arrow_len) + ']'
-        sys.stdout.write('\r' + msg)
-        sys.stdout.flush()
-
-class BoardsFileGenerator:
-
-    """Generator of boards.cfg."""
-
-    def __init__(self):
-        """Prepare basic things for generating boards.cfg."""
-        # All the defconfig files to be processed
-        defconfigs = []
-        for (dirpath, dirnames, filenames) in os.walk(CONFIG_DIR):
-            dirpath = dirpath[len(CONFIG_DIR) + 1:]
-            for filename in fnmatch.filter(filenames, '*_defconfig'):
-                if fnmatch.fnmatch(filename, '.*'):
-                    continue
-                defconfigs.append(os.path.join(dirpath, filename))
-        self.defconfigs = defconfigs
-        self.indicator = Indicator(len(defconfigs))
-
-        # Parse all the MAINTAINERS files
-        maintainers_database = MaintainersDatabase()
-        for (dirpath, dirnames, filenames) in os.walk('.'):
-            if 'MAINTAINERS' in filenames:
-                maintainers_database.parse_file(os.path.join(dirpath,
-                                                             'MAINTAINERS'))
-        self.maintainers_database = maintainers_database
-
-    def __del__(self):
-        """Delete the incomplete boards.cfg
-
-        This destructor deletes boards.cfg if the private member 'in_progress'
-        is defined as True.  The 'in_progress' member is set to True at the
-        beginning of the generate() method and set to False at its end.
-        So, in_progress==True means generating boards.cfg was terminated
-        on the way.
-        """
-
-        if hasattr(self, 'in_progress') and self.in_progress:
-            try:
-                os.remove(BOARD_FILE)
-            except OSError as exception:
-                # Ignore 'No such file or directory' error
-                if exception.errno != errno.ENOENT:
-                    raise
-            print 'Removed incomplete %s' % BOARD_FILE
-
-    def generate(self, jobs):
-        """Generate boards.cfg
-
-        This method sets the 'in_progress' member to True at the beginning
-        and sets it to False on success.  The boards.cfg should not be
-        touched before/after this method because 'in_progress' is used
-        to detect the incomplete boards.cfg.
-
-        Arguments:
-          jobs: The number of jobs to run simultaneously
-        """
-
-        self.in_progress = True
-        print 'Generating %s ...  (jobs: %d)' % (BOARD_FILE, jobs)
-
-        # Output lines should be piped into the reformat tool
-        reformat_process = subprocess.Popen(REFORMAT_CMD,
-                                            stdin=subprocess.PIPE,
-                                            stdout=open(BOARD_FILE, 'w'))
-        pipe = reformat_process.stdin
-        pipe.write(COMMENT_BLOCK)
-
-        slots = Slots(jobs, pipe, self.maintainers_database)
-
-        # Main loop to process defconfig files:
-        #  Add a new subprocess into a vacant slot.
-        #  Sleep if there is no available slot.
-        for defconfig in self.defconfigs:
-            while not slots.add(defconfig):
-                while not slots.available():
-                    # No available slot: sleep for a while
-                    time.sleep(SLEEP_TIME)
-            self.indicator.inc()
-
-        # wait until all the subprocesses finish
-        while not slots.empty():
-            time.sleep(SLEEP_TIME)
-        print ''
-
-        # wait until the reformat tool finishes
-        reformat_process.communicate()
-        if reformat_process.returncode != 0:
-            sys.exit('"%s" failed' % REFORMAT_CMD[0])
-
-        self.in_progress = False
-
-def gen_boards_cfg(jobs=1, force=False):
-    """Generate boards.cfg file.
-
-    The incomplete boards.cfg is deleted if an error (including
-    the termination by the keyboard interrupt) occurs on the halfway.
+def insert_maintainers_info(params_list):
+    """Add Status and Maintainers information to the board parameters list.
 
     Arguments:
+      params_list: A list of the board parameters
+    """
+    database = MaintainersDatabase()
+    for (dirpath, dirnames, filenames) in os.walk('.'):
+        if 'MAINTAINERS' in filenames:
+            database.parse_file(os.path.join(dirpath, 'MAINTAINERS'))
+
+    for i, params in enumerate(params_list):
+        target = params['target']
+        params['status'] = database.get_status(target)
+        params['maintainers'] = database.get_maintainers(target)
+        params_list[i] = params
+
+def format_and_output(params_list, output):
+    """Write board parameters into a file.
+
+    Columnate the board parameters, sort lines alphabetically,
+    and then write them to a file.
+
+    Arguments:
+      params_list: The list of board parameters
+      output: The path to the output file
+    """
+    FIELDS = ('status', 'arch', 'cpu', 'soc', 'vendor', 'board', 'target',
+              'options', 'maintainers')
+
+    # First, decide the width of each column
+    max_length = dict([ (f, 0) for f in FIELDS])
+    for params in params_list:
+        for f in FIELDS:
+            max_length[f] = max(max_length[f], len(params[f]))
+
+    output_lines = []
+    for params in params_list:
+        line = ''
+        for f in FIELDS:
+            # insert two spaces between fields like column -t would
+            line += '  ' + params[f].ljust(max_length[f])
+        output_lines.append(line.strip())
+
+    # ignore case when sorting
+    output_lines.sort(key=str.lower)
+
+    with open(output, 'w') as f:
+        f.write(COMMENT_BLOCK + '\n'.join(output_lines) + '\n')
+
+def gen_boards_cfg(output, jobs=1, force=False):
+    """Generate a board database file.
+
+    Arguments:
+      output: The name of the output file
       jobs: The number of jobs to run simultaneously
+      force: Force to generate the output even if it is new
     """
     check_top_directory()
-    if not force and output_is_new():
-        print "%s is up to date. Nothing to do." % BOARD_FILE
+
+    if not force and output_is_new(output):
+        print "%s is up to date. Nothing to do." % output
         sys.exit(0)
 
-    generator = BoardsFileGenerator()
-    generator.generate(jobs)
+    params_list = scan_defconfigs(jobs)
+    insert_maintainers_info(params_list)
+    format_and_output(params_list, output)
 
 def main():
+    try:
+        cpu_count = multiprocessing.cpu_count()
+    except NotImplementedError:
+        cpu_count = 1
+
     parser = optparse.OptionParser()
     # Add options here
-    parser.add_option('-j', '--jobs',
-                      help='the number of jobs to run simultaneously')
     parser.add_option('-f', '--force', action="store_true", default=False,
                       help='regenerate the output even if it is new')
+    parser.add_option('-j', '--jobs', type='int', default=cpu_count,
+                      help='the number of jobs to run simultaneously')
+    parser.add_option('-o', '--output', default=OUTPUT_FILE,
+                      help='output file [default=%s]' % OUTPUT_FILE)
     (options, args) = parser.parse_args()
 
-    if options.jobs:
-        try:
-            jobs = int(options.jobs)
-        except ValueError:
-            sys.exit('Option -j (--jobs) takes a number')
-    else:
-        try:
-            jobs = int(subprocess.Popen(['getconf', '_NPROCESSORS_ONLN'],
-                                     stdout=subprocess.PIPE).communicate()[0])
-        except (OSError, ValueError):
-            print 'info: failed to get the number of CPUs. Set jobs to 1'
-            jobs = 1
-
-    gen_boards_cfg(jobs, force=options.force)
+    gen_boards_cfg(options.output, jobs=options.jobs, force=options.force)
 
 if __name__ == '__main__':
     main()