diff --git a/poky/scripts/lib/devtool/menuconfig.py b/poky/scripts/lib/devtool/menuconfig.py
new file mode 100644
index 0000000..95384c5
--- /dev/null
+++ b/poky/scripts/lib/devtool/menuconfig.py
@@ -0,0 +1,79 @@
+# OpenEmbedded Development tool - menuconfig command plugin
+#
+# Copyright (C) 2018 Xilinx
+# Written by: Chandana Kalluri <ckalluri@xilinx.com>
+#
+# 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 menuconfig plugin"""
+
+import os
+import bb
+import logging
+import argparse
+import re
+import glob
+from devtool import setup_tinfoil, parse_recipe, DevtoolError, standard, exec_build_env_command
+from devtool import check_workspace_recipe
+logger = logging.getLogger('devtool')
+
+def menuconfig(args, config, basepath, workspace):
+    """Entry point for the devtool 'menuconfig' subcommand"""
+
+    rd = ""
+    kconfigpath = ""
+    pn_src = ""
+    localfilesdir = ""
+    workspace_dir = ""
+    tinfoil = setup_tinfoil(basepath=basepath)
+    try:
+        rd = parse_recipe(config, tinfoil, args.component, appends=True, filter_workspace=False)
+        if not rd:
+            return 1
+
+        check_workspace_recipe(workspace, args.component)
+        pn = rd.getVar('PN', True)
+
+        if not rd.getVarFlag('do_menuconfig','task'):
+            raise DevtoolError("This recipe does not support menuconfig option")
+
+        workspace_dir = os.path.join(config.workspace_path,'sources')
+        kconfigpath = rd.getVar('B')
+        pn_src = os.path.join(workspace_dir,pn)
+
+        # add check to see if oe_local_files exists or not
+        localfilesdir = os.path.join(pn_src,'oe-local-files')
+        if not os.path.exists(localfilesdir):
+            bb.utils.mkdirhier(localfilesdir)
+            # Add gitignore to ensure source tree is clean
+            gitignorefile = os.path.join(localfilesdir,'.gitignore')
+            with open(gitignorefile, 'w') as f:
+                f.write('# Ignore local files, by default. Remove this file if you want to commit the directory to Git\n')
+                f.write('*\n')
+
+    finally:
+        tinfoil.shutdown()
+
+    logger.info('Launching menuconfig')
+    exec_build_env_command(config.init_path, basepath, 'bitbake -c menuconfig %s' % pn, watch=True)
+    fragment = os.path.join(localfilesdir, 'devtool-fragment.cfg')
+    res = standard._create_kconfig_diff(pn_src,rd,fragment)
+
+    return 0
+
+def register_commands(subparsers, context):
+    """register devtool subcommands from this plugin"""
+    parser_menuconfig = subparsers.add_parser('menuconfig',help='Alter build-time configuration for a recipe', description='Launches the make menuconfig command (for recipes where do_menuconfig is available), allowing users to make changes to the build-time configuration. Creates a config fragment corresponding to changes made.', group='advanced')
+    parser_menuconfig.add_argument('component', help='compenent to alter config')
+    parser_menuconfig.set_defaults(func=menuconfig,fixed_setup=context.fixed_setup)
diff --git a/poky/scripts/lib/devtool/standard.py b/poky/scripts/lib/devtool/standard.py
index aca74b1..96af488 100644
--- a/poky/scripts/lib/devtool/standard.py
+++ b/poky/scripts/lib/devtool/standard.py
@@ -461,11 +461,37 @@
     finally:
         tinfoil.shutdown()
 
+def symlink_oelocal_files_srctree(rd,srctree):
+    import oe.patch
+    if os.path.abspath(rd.getVar('S')) == os.path.abspath(rd.getVar('WORKDIR')):
+        # If recipe extracts to ${WORKDIR}, symlink the files into the srctree
+        # (otherwise the recipe won't build as expected)
+        local_files_dir = os.path.join(srctree, 'oe-local-files')
+        addfiles = []
+        for root, _, files in os.walk(local_files_dir):
+            relpth = os.path.relpath(root, local_files_dir)
+            if relpth != '.':
+                bb.utils.mkdirhier(os.path.join(srctree, relpth))
+            for fn in files:
+                if fn == '.gitignore':
+                    continue
+                destpth = os.path.join(srctree, relpth, fn)
+                if os.path.exists(destpth):
+                    os.unlink(destpth)
+                os.symlink('oe-local-files/%s' % fn, destpth)
+                addfiles.append(os.path.join(relpth, fn))
+        if addfiles:
+            bb.process.run('git add %s' % ' '.join(addfiles), cwd=srctree)
+        useroptions = []
+        oe.patch.GitApplyTree.gitCommandUserOptions(useroptions, d=rd)
+        bb.process.run('git %s commit -a -m "Committing local file symlinks\n\n%s"' % (' '.join(useroptions), oe.patch.GitApplyTree.ignore_commit_prefix), cwd=srctree)
+
 
 def _extract_source(srctree, keep_temp, devbranch, sync, config, basepath, workspace, fixed_setup, d, tinfoil, no_overrides=False):
     """Extract sources of a recipe"""
     import oe.recipeutils
     import oe.patch
+    import oe.path
 
     pn = d.getVar('PN')
 
@@ -562,7 +588,7 @@
         with open(preservestampfile, 'w') as f:
             f.write(d.getVar('STAMP'))
         try:
-            if bb.data.inherits_class('kernel-yocto', d):
+            if is_kernel_yocto:
                 # We need to generate the kernel config
                 task = 'do_configure'
             else:
@@ -589,6 +615,23 @@
             raise DevtoolError('Something went wrong with source extraction - the devtool-source class was not active or did not function correctly:\n%s' % str(e))
         srcsubdir_rel = os.path.relpath(srcsubdir, os.path.join(tempdir, 'workdir'))
 
+        # Check if work-shared is empty, if yes
+        # find source and copy to work-shared
+        if is_kernel_yocto:
+            workshareddir = d.getVar('STAGING_KERNEL_DIR')
+            staging_kerVer = get_staging_kver(workshareddir)
+            kernelVersion = d.getVar('LINUX_VERSION')
+
+            # handle dangling symbolic link in work-shared:
+            if os.path.islink(workshareddir):
+                os.unlink(workshareddir)
+
+            if os.path.exists(workshareddir) and (not os.listdir(workshareddir) or kernelVersion != staging_kerVer):
+                shutil.rmtree(workshareddir)
+                oe.path.copyhardlinktree(srcsubdir,workshareddir)
+            elif not os.path.exists(workshareddir):
+                oe.path.copyhardlinktree(srcsubdir,workshareddir)
+
         tempdir_localdir = os.path.join(tempdir, 'oe-local-files')
         srctree_localdir = os.path.join(srctree, 'oe-local-files')
 
@@ -617,29 +660,7 @@
                 shutil.move(tempdir_localdir, srcsubdir)
 
             shutil.move(srcsubdir, srctree)
-
-            if os.path.abspath(d.getVar('S')) == os.path.abspath(d.getVar('WORKDIR')):
-                # If recipe extracts to ${WORKDIR}, symlink the files into the srctree
-                # (otherwise the recipe won't build as expected)
-                local_files_dir = os.path.join(srctree, 'oe-local-files')
-                addfiles = []
-                for root, _, files in os.walk(local_files_dir):
-                    relpth = os.path.relpath(root, local_files_dir)
-                    if relpth != '.':
-                        bb.utils.mkdirhier(os.path.join(srctree, relpth))
-                    for fn in files:
-                        if fn == '.gitignore':
-                            continue
-                        destpth = os.path.join(srctree, relpth, fn)
-                        if os.path.exists(destpth):
-                            os.unlink(destpth)
-                        os.symlink('oe-local-files/%s' % fn, destpth)
-                        addfiles.append(os.path.join(relpth, fn))
-                if addfiles:
-                    bb.process.run('git add %s' % ' '.join(addfiles), cwd=srctree)
-                useroptions = []
-                oe.patch.GitApplyTree.gitCommandUserOptions(useroptions, d=d)
-                bb.process.run('git %s commit -a -m "Committing local file symlinks\n\n%s"' % (' '.join(useroptions), oe.patch.GitApplyTree.ignore_commit_prefix), cwd=srctree)
+            symlink_oelocal_files_srctree(d,srctree)
 
         if is_kernel_yocto:
             logger.info('Copying kernel config to srctree')
@@ -707,11 +728,31 @@
                     tf.write(line)
     os.rename(newfile, origfile)
 
+def get_staging_kver(srcdir):
+    # Kernel version from work-shared
+    kerver = []
+    staging_kerVer=""
+    if os.path.exists(srcdir) and os.listdir(srcdir):
+        with open(os.path.join(srcdir,"Makefile")) as f:
+            version = [next(f) for x in range(5)][1:4]
+            for word in version:
+                kerver.append(word.split('= ')[1].split('\n')[0])
+            staging_kerVer = ".".join(kerver)
+    return staging_kerVer
+
+def get_staging_kbranch(srcdir):
+    staging_kbranch = ""
+    if os.path.exists(srcdir) and os.listdir(srcdir):
+        (branch, _) = bb.process.run('git branch | grep \* | cut -d \' \' -f2', cwd=srcdir)
+        staging_kbranch = "".join(branch.split('\n')[0])
+    return staging_kbranch
+
 def modify(args, config, basepath, workspace):
     """Entry point for the devtool 'modify' subcommand"""
     import bb
     import oe.recipeutils
     import oe.patch
+    import oe.path
 
     if args.recipename in workspace:
         raise DevtoolError("recipe %s is already in your workspace" %
@@ -753,6 +794,59 @@
         initial_rev = None
         commits = []
         check_commits = False
+
+        if bb.data.inherits_class('kernel-yocto', rd):
+            # Current set kernel version
+            kernelVersion = rd.getVar('LINUX_VERSION')
+            srcdir = rd.getVar('STAGING_KERNEL_DIR')
+            kbranch = rd.getVar('KBRANCH')
+
+            staging_kerVer = get_staging_kver(srcdir)
+            staging_kbranch = get_staging_kbranch(srcdir)
+            if (os.path.exists(srcdir) and os.listdir(srcdir)) and (kernelVersion in staging_kerVer and staging_kbranch == kbranch):
+                oe.path.copyhardlinktree(srcdir,srctree)
+                workdir = rd.getVar('WORKDIR')
+                srcsubdir = rd.getVar('S')
+                localfilesdir = os.path.join(srctree,'oe-local-files')
+                # Move local source files into separate subdir
+                recipe_patches = [os.path.basename(patch) for patch in oe.recipeutils.get_recipe_patches(rd)]
+                local_files = oe.recipeutils.get_recipe_local_files(rd)
+
+                for key in local_files.copy():
+                    if key.endswith('scc'):
+                        sccfile = open(local_files[key], 'r')
+                        for l in sccfile:
+                            line = l.split()
+                            if line and line[0] in ('kconf', 'patch'):
+                                cfg = os.path.join(os.path.dirname(local_files[key]), line[-1])
+                                if not cfg in local_files.values():
+                                    local_files[line[-1]] = cfg
+                                    shutil.copy2(cfg, workdir)
+                        sccfile.close()
+
+                # Ignore local files with subdir={BP}
+                srcabspath = os.path.abspath(srcsubdir)
+                local_files = [fname for fname in local_files if os.path.exists(os.path.join(workdir, fname)) and  (srcabspath == workdir or not  os.path.join(workdir, fname).startswith(srcabspath + os.sep))]
+                if local_files:
+                    for fname in local_files:
+                        _move_file(os.path.join(workdir, fname), os.path.join(srctree, 'oe-local-files', fname))
+                    with open(os.path.join(srctree, 'oe-local-files', '.gitignore'), 'w') as f:
+                        f.write('# Ignore local files, by default. Remove this file ''if you want to commit the directory to Git\n*\n')
+
+                symlink_oelocal_files_srctree(rd,srctree)
+
+                task = 'do_configure'
+                res = tinfoil.build_targets(pn, task, handle_events=True)
+
+                # Copy .config to workspace
+                kconfpath = rd.getVar('B')
+                logger.info('Copying kernel config to workspace')
+                shutil.copy2(os.path.join(kconfpath, '.config'),srctree)
+
+                # Set this to true, we still need to get initial_rev
+                # by parsing the git repo
+                args.no_extract = True
+
         if not args.no_extract:
             initial_rev, _ = _extract_source(srctree, args.keep_temp, args.branch, False, config, basepath, workspace, args.fixed_setup, rd, tinfoil, no_overrides=args.no_overrides)
             if not initial_rev:
@@ -844,6 +938,11 @@
                         '    cp ${B}/.config ${S}/.config.baseline\n'
                         '    ln -sfT ${B}/.config ${S}/.config.new\n'
                         '}\n')
+            if rd.getVarFlag('do_menuconfig','task'):
+                f.write('\ndo_configure_append() {\n'
+                '    cp ${B}/.config ${S}/.config.baseline\n'
+                '    ln -sfT ${B}/.config ${S}/.config.new\n'
+                '}\n')
             if initial_rev:
                 f.write('\n# initial_rev: %s\n' % initial_rev)
                 for commit in commits:
@@ -1866,13 +1965,27 @@
 def _get_layer(layername, d):
     """Determine the base layer path for the specified layer name/path"""
     layerdirs = d.getVar('BBLAYERS').split()
-    layers = {os.path.basename(p): p for p in layerdirs}
+    layers = {}    # {basename: layer_paths}
+    for p in layerdirs:
+        bn = os.path.basename(p)
+        if bn not in layers:
+            layers[bn] = [p]
+        else:
+            layers[bn].append(p)
     # Provide some shortcuts
     if layername.lower() in ['oe-core', 'openembedded-core']:
-        layerdir = layers.get('meta', None)
+        layername = 'meta'
+    layer_paths = layers.get(layername, None)
+    if not layer_paths:
+        return os.path.abspath(layername)
+    elif len(layer_paths) == 1:
+        return os.path.abspath(layer_paths[0])
     else:
-        layerdir = layers.get(layername, None)
-    return os.path.abspath(layerdir or layername)
+        # multiple layers having the same base name
+        logger.warning("Multiple layers have the same base name '%s', use the first one '%s'." % (layername, layer_paths[0]))
+        logger.warning("Consider using path instead of base name to specify layer:\n\t\t%s" % '\n\t\t'.join(layer_paths))
+        return os.path.abspath(layer_paths[0])
+
 
 def finish(args, config, basepath, workspace):
     """Entry point for the devtool 'finish' subcommand"""
diff --git a/poky/scripts/lib/devtool/upgrade.py b/poky/scripts/lib/devtool/upgrade.py
index 62ec2f9..18c5b66 100644
--- a/poky/scripts/lib/devtool/upgrade.py
+++ b/poky/scripts/lib/devtool/upgrade.py
@@ -122,18 +122,22 @@
     rfp = os.path.split(rf)[0] # recipe folder
     rfpp = os.path.split(rfp)[0] # recipes folder
     if os.path.exists(rfp):
-        shutil.rmtree(b)
+        shutil.rmtree(rfp)
     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)
+def _upgrade_error(e, rf, srctree, keep_failure=False, extramsg=None):
+    if rf and not keep_failure:
+        _cleanup_on_error(rf, srctree)
     logger.error(e)
-    raise DevtoolError(e)
+    if extramsg:
+        logger.error(extramsg)
+    if keep_failure:
+        logger.info('Preserving failed upgrade files (--keep-failure)')
+    sys.exit(1)
 
 def _get_uri(rd):
     srcuris = rd.getVar('SRC_URI').split()
@@ -277,6 +281,7 @@
             logger.info('Preserving temporary directory %s' % tmpsrctree)
         else:
             shutil.rmtree(tmpsrctree)
+            shutil.rmtree(tmpdir)
 
     return (rev, md5, sha256, srcbranch, srcsubdir_rel)
 
@@ -299,7 +304,7 @@
         f.write("\n#\n\n".encode())
         f.write(orig_content)
 
-def _create_new_recipe(newpv, md5, sha256, srcrev, srcbranch, srcsubdir_old, srcsubdir_new, workspace, tinfoil, rd, license_diff, new_licenses):
+def _create_new_recipe(newpv, md5, sha256, srcrev, srcbranch, srcsubdir_old, srcsubdir_new, workspace, tinfoil, rd, license_diff, new_licenses, srctree, keep_failure):
     """Creates the new recipe under workspace"""
 
     bpn = rd.getVar('BPN')
@@ -416,7 +421,10 @@
         newvalues["LIC_FILES_CHKSUM"] = newlicchksum
         _add_license_diff_to_recipe(fullpath, license_diff)
 
-    rd = tinfoil.parse_recipe_file(fullpath, False)
+    try:
+        rd = tinfoil.parse_recipe_file(fullpath, False)
+    except bb.tinfoil.TinfoilCommandFailed as e:
+        _upgrade_error(e, fullpath, srctree, keep_failure, 'Parsing of upgraded recipe failed')
     oe.recipeutils.patch_recipe(rd, fullpath, newvalues)
 
     return fullpath, copied
@@ -548,11 +556,11 @@
                                                     tinfoil, rd)
             new_licenses = _extract_licenses(srctree, rd.getVar('LIC_FILES_CHKSUM'))
             license_diff = _generate_license_diff(old_licenses, new_licenses)
-            rf, copied = _create_new_recipe(args.version, md5, sha256, args.srcrev, srcbranch, srcsubdir1, srcsubdir2, config.workspace_path, tinfoil, rd, license_diff, new_licenses)
+            rf, copied = _create_new_recipe(args.version, md5, sha256, args.srcrev, srcbranch, srcsubdir1, srcsubdir2, config.workspace_path, tinfoil, rd, license_diff, new_licenses, srctree, args.keep_failure)
         except bb.process.CmdError as e:
-            _upgrade_error(e, rf, srctree)
+            _upgrade_error(e, rf, srctree, args.keep_failure)
         except DevtoolError as e:
-            _upgrade_error(e, rf, srctree)
+            _upgrade_error(e, rf, srctree, args.keep_failure)
         standard._add_md5(config, pn, os.path.dirname(rf))
 
         af = _write_append(rf, srctree, args.same_dir, args.no_same_dir, rev2,
@@ -623,6 +631,7 @@
     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.add_argument('--keep-failure', action="store_true", help='Keep failed upgrade recipe and associated files  (for debugging)')
     parser_upgrade.set_defaults(func=upgrade, fixed_setup=context.fixed_setup)
 
     parser_latest_version = subparsers.add_parser('latest-version', help='Report the latest version of an existing recipe',