diff --git a/scripts/lib/devtool/upgrade.py b/scripts/lib/devtool/upgrade.py
new file mode 100644
index 0000000..86443b0
--- /dev/null
+++ b/scripts/lib/devtool/upgrade.py
@@ -0,0 +1,354 @@
+# Development tool - upgrade command plugin
+#
+# Copyright (C) 2014-2015 Intel Corporation
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+"""Devtool upgrade plugin"""
+
+import os
+import sys
+import re
+import shutil
+import tempfile
+import logging
+import argparse
+import scriptutils
+import errno
+import bb
+import oe.recipeutils
+from devtool import standard
+from devtool import exec_build_env_command, setup_tinfoil, DevtoolError, parse_recipe
+
+logger = logging.getLogger('devtool')
+
+def plugin_init(pluginlist):
+    """Plugin initialization"""
+    pass
+
+def _run(cmd, cwd=''):
+    logger.debug("Running command %s> %s" % (cwd,cmd))
+    return bb.process.run('%s' % cmd, cwd=cwd)
+
+def _get_srctree(tmpdir):
+    srctree = tmpdir
+    dirs = os.listdir(tmpdir)
+    if len(dirs) == 1:
+        srctree = os.path.join(tmpdir, dirs[0])
+    return srctree
+
+def _copy_source_code(orig, dest):
+    for path in standard._ls_tree(orig):
+        dest_dir = os.path.join(dest, os.path.dirname(path))
+        bb.utils.mkdirhier(dest_dir)
+        dest_path = os.path.join(dest, path)
+        os.rename(os.path.join(orig, path), dest_path)
+
+def _get_checksums(rf):
+    import re
+    checksums = {}
+    with open(rf) as f:
+        for line in f:
+            for cs in ['md5sum', 'sha256sum']:
+                m = re.match("^SRC_URI\[%s\].*=.*\"(.*)\"" % cs, line)
+                if m:
+                    checksums[cs] = m.group(1)
+    return checksums
+
+def _replace_checksums(rf, md5, sha256):
+    if not md5 and not sha256:
+        return
+    checksums = {'md5sum':md5, 'sha256sum':sha256}
+    with open(rf + ".tmp", "w+") as tmprf:
+        with open(rf) as f:
+            for line in f:
+                m = None
+                for cs in checksums.keys():
+                    m = re.match("^SRC_URI\[%s\].*=.*\"(.*)\"" % cs, line)
+                    if m:
+                        if checksums[cs]:
+                            oldcheck = m.group(1)
+                            newcheck = checksums[cs]
+                            line = line.replace(oldcheck, newcheck)
+                        break
+                tmprf.write(line)
+    os.rename(rf + ".tmp", rf)
+
+
+def _remove_patch_dirs(recipefolder):
+    for root, dirs, files in os.walk(recipefolder):
+        for d in dirs:
+            shutil.rmtree(os.path.join(root,d))
+
+def _recipe_contains(rf, var):
+    import re
+    found = False
+    with open(rf) as f:
+        for line in f:
+            if re.match("^%s.*=.*" % var, line):
+                found = True
+                break
+    return found
+
+def _rename_recipe_dirs(oldpv, newpv, path):
+    for root, dirs, files in os.walk(path):
+        for olddir in dirs:
+            if olddir.find(oldpv) != -1:
+                newdir = olddir.replace(oldpv, newpv)
+                if olddir != newdir:
+                    _run('mv %s %s' % (olddir, newdir))
+
+def _rename_recipe_file(bpn, oldpv, newpv, path):
+    oldrecipe = "%s_%s.bb" % (bpn, oldpv)
+    newrecipe = "%s_%s.bb" % (bpn, newpv)
+    if os.path.isfile(os.path.join(path, oldrecipe)):
+        if oldrecipe != newrecipe:
+            _run('mv %s %s' % (oldrecipe, newrecipe), cwd=path)
+    else:
+        recipe = "%s_git.bb" % bpn
+        if os.path.isfile(os.path.join(path, recipe)):
+            newrecipe = recipe
+            raise DevtoolError("Original recipe not found on workspace")
+    return os.path.join(path, newrecipe)
+
+def _rename_recipe_files(bpn, oldpv, newpv, path):
+    _rename_recipe_dirs(oldpv, newpv, path)
+    return _rename_recipe_file(bpn, oldpv, newpv, path)
+
+def _use_external_build(same_dir, no_same_dir, d):
+    b_is_s = True
+    if no_same_dir:
+        logger.info('using separate build directory since --no-same-dir specified')
+        b_is_s = False
+    elif same_dir:
+        logger.info('using source tree as build directory since --same-dir specified')
+    elif bb.data.inherits_class('autotools-brokensep', d):
+        logger.info('using source tree as build directory since original recipe inherits autotools-brokensep')
+    elif d.getVar('B', True) == os.path.abspath(d.getVar('S', True)):
+        logger.info('using source tree as build directory since that is the default for this recipe')
+    else:
+        b_is_s = False
+    return b_is_s
+
+def _write_append(rc, srctree, same_dir, no_same_dir, rev, workspace, d):
+    """Writes an append file"""
+    if not os.path.exists(rc):
+        raise DevtoolError("bbappend not created because %s does not exist" % rc)
+
+    appendpath = os.path.join(workspace, 'appends')
+    if not os.path.exists(appendpath):
+        bb.utils.mkdirhier(appendpath)
+
+    brf = os.path.basename(os.path.splitext(rc)[0]) # rc basename
+
+    srctree = os.path.abspath(srctree)
+    pn = d.getVar('PN',True)
+    af = os.path.join(appendpath, '%s.bbappend' % brf)
+    with open(af, 'w') as f:
+        f.write('FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"\n\n')
+        f.write('inherit externalsrc\n')
+        f.write(('# NOTE: We use pn- overrides here to avoid affecting'
+                 'multiple variants in the case where the recipe uses BBCLASSEXTEND\n'))
+        f.write('EXTERNALSRC_pn-%s = "%s"\n' % (pn, srctree))
+        if _use_external_build(same_dir, no_same_dir, d):
+            f.write('EXTERNALSRC_BUILD_pn-%s = "%s"\n' % (pn, srctree))
+        if rev:
+            f.write('\n# initial_rev: %s\n' % rev)
+    return af
+
+def _cleanup_on_error(rf, srctree):
+    rfp = os.path.split(rf)[0] # recipe folder
+    rfpp = os.path.split(rfp)[0] # recipes folder
+    if os.path.exists(rfp):
+        shutil.rmtree(b)
+    if not len(os.listdir(rfpp)):
+        os.rmdir(rfpp)
+    srctree = os.path.abspath(srctree)
+    if os.path.exists(srctree):
+        shutil.rmtree(srctree)
+
+def _upgrade_error(e, rf, srctree):
+    if rf:
+        cleanup_on_error(rf, srctree)
+    logger.error(e)
+    raise DevtoolError(e)
+
+def _get_uri(rd):
+    srcuris = rd.getVar('SRC_URI', True).split()
+    if not len(srcuris):
+        raise DevtoolError('SRC_URI not found on recipe')
+    srcuri = srcuris[0] # it is assumed, URI is at first position
+    srcrev = '${AUTOREV}'
+    if '://' in srcuri:
+        # Fetch a URL
+        rev_re = re.compile(';rev=([^;]+)')
+        res = rev_re.search(srcuri)
+        if res:
+            srcrev = res.group(1)
+            srcuri = rev_re.sub('', srcuri)
+    return srcuri, srcrev
+
+def _extract_new_source(newpv, srctree, no_patch, srcrev, branch, keep_temp, tinfoil, rd):
+    """Extract sources of a recipe with a new version"""
+
+    def __run(cmd):
+        """Simple wrapper which calls _run with srctree as cwd"""
+        return _run(cmd, srctree)
+
+    crd = rd.createCopy()
+
+    pv = crd.getVar('PV', True)
+    crd.setVar('PV', newpv)
+
+    tmpsrctree = None
+    uri, rev = _get_uri(crd)
+    if srcrev:
+        rev = srcrev
+    if uri.startswith('git://'):
+        __run('git checkout %s' % rev)
+        __run('git tag -f devtool-base-new')
+        md5 = None
+        sha256 = None
+    else:
+        __run('git checkout -b devtool-%s' % newpv)
+
+        tmpdir = tempfile.mkdtemp(prefix='devtool')
+        try:
+            md5, sha256 = scriptutils.fetch_uri(tinfoil.config_data, uri, tmpdir, rev)
+        except bb.fetch2.FetchError as e:
+            raise DevtoolError(e)
+
+        tmpsrctree = _get_srctree(tmpdir)
+
+        scrtree = os.path.abspath(srctree)
+
+        _copy_source_code(tmpsrctree, srctree)
+
+        (stdout,_) = __run('git ls-files --modified --others --exclude-standard')
+        for f in stdout.splitlines():
+            __run('git add "%s"' % f)
+
+        __run('git commit -q -m "Commit of upstream changes at version %s" --allow-empty' % newpv)
+        __run('git tag -f devtool-base-%s' % newpv)
+
+    (stdout, _) = __run('git rev-parse HEAD')
+    rev = stdout.rstrip()
+
+    if no_patch:
+        patches = oe.recipeutils.get_recipe_patches(crd)
+        if len(patches):
+            logger.warn('By user choice, the following patches will NOT be applied')
+            for patch in patches:
+                logger.warn("%s" % os.path.basename(patch))
+    else:
+        try:
+            __run('git checkout devtool-patched -b %s' % branch)
+            __run('git rebase %s' % rev)
+            if uri.startswith('git://'):
+                suffix = 'new'
+            else:
+                suffix = newpv
+            __run('git tag -f devtool-patched-%s' % suffix)
+        except bb.process.ExecutionError as e:
+            logger.warn('Command \'%s\' failed:\n%s' % (e.command, e.stdout))
+
+    if tmpsrctree:
+        if keep_temp:
+            logger.info('Preserving temporary directory %s' % tmpsrctree)
+        else:
+            shutil.rmtree(tmpsrctree)
+
+    return (rev, md5, sha256)
+
+def _create_new_recipe(newpv, md5, sha256, workspace, rd):
+    """Creates the new recipe under workspace"""
+    crd = rd.createCopy()
+
+    bpn = crd.getVar('BPN', True)
+    path = os.path.join(workspace, 'recipes', bpn)
+    bb.utils.mkdirhier(path)
+    oe.recipeutils.copy_recipe_files(crd, path)
+
+    oldpv = crd.getVar('PV', True)
+    if not newpv:
+        newpv = oldpv
+    fullpath = _rename_recipe_files(bpn, oldpv, newpv, path)
+
+    if _recipe_contains(fullpath, 'PV') and newpv != oldpv:
+        oe.recipeutils.patch_recipe(d, fullpath, {'PV':newpv})
+
+    if md5 and sha256:
+        # Unfortunately, oe.recipeutils.patch_recipe cannot update flags.
+        # once the latter feature is implemented, we should call patch_recipe
+        # instead of the following function
+        _replace_checksums(fullpath, md5, sha256)
+
+    return fullpath
+
+def upgrade(args, config, basepath, workspace):
+    """Entry point for the devtool 'upgrade' subcommand"""
+
+    if args.recipename in workspace:
+        raise DevtoolError("recipe %s is already in your workspace" % args.recipename)
+    if not args.version and not args.srcrev:
+        raise DevtoolError("You must provide a version using the --version/-V option, or for recipes that fetch from an SCM such as git, the --srcrev/-S option")
+
+    reason = oe.recipeutils.validate_pn(args.recipename)
+    if reason:
+        raise DevtoolError(reason)
+
+    tinfoil = setup_tinfoil()
+
+    rd = parse_recipe(config, tinfoil, args.recipename, True)
+    if not rd:
+        return 1
+
+    standard._check_compatible_recipe(args.recipename, rd)
+    if rd.getVar('PV', True) == args.version and rd.getVar('SRCREV', True) == args.srcrev:
+        raise DevtoolError("Current and upgrade versions are the same version" % version)
+
+    rf = None
+    try:
+        rev1 = standard._extract_source(args.srctree, False, 'devtool-orig', rd)
+        rev2, md5, sha256 = _extract_new_source(args.version, args.srctree, args.no_patch,
+                                                args.srcrev, args.branch, args.keep_temp,
+                                                tinfoil, rd)
+        rf = _create_new_recipe(args.version, md5, sha256, config.workspace_path, rd)
+    except bb.process.CmdError as e:
+        _upgrade_error(e, rf, args.srctree)
+    except DevtoolError as e:
+        _upgrade_error(e, rf, args.srctree)
+    standard._add_md5(config, args.recipename, os.path.dirname(rf))
+
+    af = _write_append(rf, args.srctree, args.same_dir, args.no_same_dir, rev2,
+                       config.workspace_path, rd)
+    standard._add_md5(config, args.recipename, af)
+    logger.info('Upgraded source extracted to %s' % args.srctree)
+    return 0
+
+def register_commands(subparsers, context):
+    """Register devtool subcommands from this plugin"""
+    parser_upgrade = subparsers.add_parser('upgrade', help='Upgrade an existing recipe',
+                                           description='Upgrades an existing recipe to a new upstream version')
+    parser_upgrade.add_argument('recipename', help='Name for recipe to extract the source for')
+    parser_upgrade.add_argument('srctree', help='Path to where to extract the source tree')
+    parser_upgrade.add_argument('--version', '-V', help='Version to upgrade to (PV)')
+    parser_upgrade.add_argument('--srcrev', '-S', help='Source revision to upgrade to (if fetching from an SCM such as git)')
+    parser_upgrade.add_argument('--branch', '-b', default="devtool", help='Name for new development branch to checkout (default "%(default)s")')
+    parser_upgrade.add_argument('--no-patch', action="store_true", help='Do not apply patches from the recipe to the new source code')
+    group = parser_upgrade.add_mutually_exclusive_group()
+    group.add_argument('--same-dir', '-s', help='Build in same directory as source', action="store_true")
+    group.add_argument('--no-same-dir', help='Force build in a separate build directory', action="store_true")
+    parser_upgrade.add_argument('--keep-temp', action="store_true", help='Keep temporary directory (for debugging)')
+    parser_upgrade.set_defaults(func=upgrade)