diff --git a/poky/scripts/buildhistory-collect-srcrevs b/poky/scripts/buildhistory-collect-srcrevs
index 340bee7..bca01a9 100755
--- a/poky/scripts/buildhistory-collect-srcrevs
+++ b/poky/scripts/buildhistory-collect-srcrevs
@@ -101,7 +101,7 @@
                 if name:
                     print('SRCREV_%s_pn-%s%s = "%s"' % (name, pn, forcevariable, srcrev))
                 else:
-                    print('SRCREV_pn-%s%s = "%s"' % (pn, forcevariable, srcrev))
+                    print('SRCREV:pn-%s%s = "%s"' % (pn, forcevariable, srcrev))
 
 
 if __name__ == "__main__":
diff --git a/poky/scripts/contrib/convert-overrides.py b/poky/scripts/contrib/convert-overrides.py
new file mode 100755
index 0000000..e4a310d
--- /dev/null
+++ b/poky/scripts/contrib/convert-overrides.py
@@ -0,0 +1,144 @@
+#!/usr/bin/env python3
+#
+# Conversion script to add new override syntax to existing bitbake metadata
+#
+# Copyright (C) 2021 Richard Purdie
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
+#
+# To use this script on a new layer you need to list the overrides the
+# layer is known to use in the list below.
+#
+# Known constraint: Matching is 'loose' and in particular will find variable
+# and function names with "_append" and "_remove" in them. Those need to be
+# filtered out manually or in the skip list below.
+#
+
+import re
+import os
+import sys
+import tempfile
+import shutil
+import mimetypes
+
+if len(sys.argv) < 2:
+    print("Please specify a directory to run the conversion script against.")
+    sys.exit(1)
+
+# List of strings to treat as overrides
+vars = ["append", "prepend", "remove"]
+vars = vars + ["qemuarm", "qemux86", "qemumips", "qemuppc", "qemuriscv", "qemuall"]
+vars = vars + ["genericx86", "edgerouter", "beaglebone-yocto"]
+vars = vars + ["armeb", "arm", "armv5", "armv6", "armv4", "powerpc64", "aarch64", "riscv32", "riscv64", "x86", "mips64", "powerpc"]
+vars = vars + ["mipsarch", "x86-x32", "mips16e", "microblaze", "e5500-64b", "mipsisa32", "mipsisa64"]
+vars = vars + ["class-native", "class-target", "class-cross-canadian", "class-cross", "class-devupstream"]
+vars = vars + ["tune-",  "pn-", "forcevariable"]
+vars = vars + ["libc-musl", "libc-glibc", "libc-newlib","libc-baremetal"]
+vars = vars + ["task-configure", "task-compile", "task-install", "task-clean", "task-image-qa", "task-rm_work", "task-image-complete", "task-populate-sdk"]
+vars = vars + ["toolchain-clang", "mydistro", "nios2", "sdkmingw32", "overrideone", "overridetwo"]
+vars = vars + ["linux-gnux32", "linux-muslx32", "linux-gnun32", "mingw32", "poky", "darwin", "linuxstdbase"]
+vars = vars + ["linux-gnueabi", "eabi"]
+vars = vars + ["virtclass-multilib", "virtclass-mcextend"]
+
+# List of strings to treat as overrides but only with whitespace following or another override (more restricted matching).
+# Handles issues with arc matching arch.
+shortvars = ["arc", "mips", "mipsel", "sh4"]
+
+# Variables which take packagenames as an override
+packagevars = ["FILES", "RDEPENDS", "RRECOMMENDS", "SUMMARY", "DESCRIPTION", "RSUGGESTS", "RPROVIDES", "RCONFLICTS", "PKG", "ALLOW_EMPTY",
+              "pkg_postrm", "pkg_postinst_ontarget", "pkg_postinst", "INITSCRIPT_NAME", "INITSCRIPT_PARAMS", "DEBIAN_NOAUTONAME", "ALTERNATIVE",
+              "PKGE", "PKGV", "PKGR", "USERADD_PARAM", "GROUPADD_PARAM", "CONFFILES", "SYSTEMD_SERVICE", "LICENSE", "SECTION", "pkg_preinst",
+              "pkg_prerm", "RREPLACES", "GROUPMEMS_PARAM", "SYSTEMD_AUTO_ENABLE", "SKIP_FILEDEPS", "PRIVATE_LIBS", "PACKAGE_ADD_METADATA",
+              "INSANE_SKIP", "DEBIANNAME", "SYSTEMD_SERVICE_ESCAPED"]
+
+# Expressions to skip if encountered, these are not overrides
+skips = ["parser_append", "recipe_to_append", "extra_append", "to_remove", "show_appends", "applied_appends", "file_appends", "handle_remove"]
+skips = skips + ["expanded_removes", "color_remove", "test_remove", "empty_remove", "toaster_prepend", "num_removed", "licfiles_append", "_write_append"]
+skips = skips + ["no_report_remove", "test_prepend", "test_append", "multiple_append", "test_remove", "shallow_remove", "do_remove_layer", "first_append"]
+skips = skips + ["parser_remove", "to_append", "no_remove", "bblayers_add_remove", "bblayers_remove", "apply_append", "is_x86", "base_dep_prepend"]
+skips = skips + ["autotools_dep_prepend", "go_map_arm", "alt_remove_links", "systemd_append_file", "file_append", "process_file_darwin"]
+skips = skips + ["run_loaddata_poky", "determine_if_poky_env", "do_populate_poky_src", "libc_cv_include_x86_isa_level", "test_rpm_remove", "do_install_armmultilib"]
+skips = skips + ["get_appends_for_files", "test_doubleref_remove", "test_bitbakelayers_add_remove", "elf32_x86_64", "colour_remove", "revmap_remove"]
+skips = skips + ["test_rpm_remove", "test_bitbakelayers_add_remove", "recipe_append_file", "log_data_removed", "recipe_append", "systemd_machine_unit_append"]
+skips = skips + ["recipetool_append", "changetype_remove", "try_appendfile_wc", "test_qemux86_directdisk", "test_layer_appends", "tgz_removed"]
+
+imagevars = ["IMAGE_CMD", "EXTRA_IMAGECMD", "IMAGE_TYPEDEP", "CONVERSION_CMD", "COMPRESS_CMD"]
+packagevars = packagevars + imagevars
+
+vars_re = {}
+for exp in vars:
+    vars_re[exp] = (re.compile('((^|[\'"\s\-\+])[A-Za-z0-9_\-:${}\.]+)_' + exp), r"\1:" + exp)
+
+shortvars_re = {}
+for exp in shortvars:
+    shortvars_re[exp] = (re.compile('((^|[\'"\s\-\+])[A-Za-z0-9_\-:${}\.]+)_' + exp + '([\(\'"\s:])'), r"\1:" + exp + r"\3")
+
+package_re = {}
+for exp in packagevars:
+    package_re[exp] = (re.compile('(^|[\'"\s\-\+]+)' + exp + '_' + '([$a-z"\'\s%\[<{\\\*].)'), r"\1" + exp + r":\2")
+
+# Other substitutions to make
+subs = {
+    'r = re.compile("([^:]+):\s*(.*)")' : 'r = re.compile("(^.+?):\s+(.*)")',
+    "val = d.getVar('%s_%s' % (var, pkg))" : "val = d.getVar('%s:%s' % (var, pkg))",
+    "f.write('%s_%s: %s\\n' % (var, pkg, encode(val)))" : "f.write('%s:%s: %s\\n' % (var, pkg, encode(val)))",
+    "d.getVar('%s_%s' % (scriptlet_name, pkg))" : "d.getVar('%s:%s' % (scriptlet_name, pkg))",
+    'ret.append(v + "_" + p)' : 'ret.append(v + ":" + p)',
+}
+
+def processfile(fn):
+    print("processing file '%s'" % fn)
+    try:
+        fh, abs_path = tempfile.mkstemp()
+        with os.fdopen(fh, 'w') as new_file:
+            with open(fn, "r") as old_file:
+                for line in old_file:
+                    skip = False
+                    for s in skips:
+                        if s in line:
+                            skip = True
+                            if "ptest_append" in line or "ptest_remove" in line or "ptest_prepend" in line:
+                                skip = False
+                    for sub in subs:
+                        if sub in line:
+                            line = line.replace(sub, subs[sub])
+                            skip = True
+                    if not skip:
+                        for pvar in packagevars:
+                            line = package_re[pvar][0].sub(package_re[pvar][1], line)
+                        for var in vars:
+                            line = vars_re[var][0].sub(vars_re[var][1], line)
+                        for shortvar in shortvars:
+                            line = shortvars_re[shortvar][0].sub(shortvars_re[shortvar][1], line)
+                    if "pkg_postinst:ontarget" in line:
+                        line = line.replace("pkg_postinst:ontarget", "pkg_postinst_ontarget")
+                    new_file.write(line)
+        shutil.copymode(fn, abs_path)
+        os.remove(fn)
+        shutil.move(abs_path, fn)
+    except UnicodeDecodeError:
+        pass
+
+ourname = os.path.basename(sys.argv[0])
+ourversion = "0.9.3"
+
+if os.path.isfile(sys.argv[1]):
+    processfile(sys.argv[1])
+    sys.exit(0)
+
+for targetdir in sys.argv[1:]:
+    print("processing directory '%s'" % targetdir)
+    for root, dirs, files in os.walk(targetdir):
+        for name in files:
+            if name == ourname:
+                continue
+            fn = os.path.join(root, name)
+            if os.path.islink(fn):
+                continue
+            if "/.git/" in fn or fn.endswith(".html") or fn.endswith(".patch") or fn.endswith(".m4") or fn.endswith(".diff"):
+                continue
+            processfile(fn)
+
+print("All files processed with version %s" % ourversion)
diff --git a/poky/scripts/crosstap b/poky/scripts/crosstap
index 40856bc..73c8947 100755
--- a/poky/scripts/crosstap
+++ b/poky/scripts/crosstap
@@ -365,13 +365,13 @@
 USER_CLASSES += "image-combined-dbg"
 
 # enables kernel debug symbols
-KERNEL_EXTRA_FEATURES_append = " features/debug/debug-kernel.scc"
+KERNEL_EXTRA_FEATURES:append = " features/debug/debug-kernel.scc"
 
 # minimal, just run-time systemtap configuration in target image
-PACKAGECONFIG_pn-systemtap = "monitor"
+PACKAGECONFIG:pn-systemtap = "monitor"
 
 # add systemtap run-time into target image if it is not there yet
-IMAGE_INSTALL_append = " systemtap"
+IMAGE_INSTALL:append = " systemtap"
 """
     option_parser = optparse.OptionParser(usage=usage)
 
diff --git a/poky/scripts/devtool b/poky/scripts/devtool
index 8a4f41b..af4811b 100755
--- a/poky/scripts/devtool
+++ b/poky/scripts/devtool
@@ -100,7 +100,7 @@
         _enable_workspace_layer(config.workspace_path, config, basepath)
 
     logger.debug('Reading workspace in %s' % config.workspace_path)
-    externalsrc_re = re.compile(r'^EXTERNALSRC(_pn-([^ =]+))? *= *"([^"]*)"$')
+    externalsrc_re = re.compile(r'^EXTERNALSRC(:pn-([^ =]+))? *= *"([^"]*)"$')
     for fn in glob.glob(os.path.join(config.workspace_path, 'appends', '*.bbappend')):
         with open(fn, 'r') as f:
             pnvalues = {}
diff --git a/poky/scripts/lib/checklayer/__init__.py b/poky/scripts/lib/checklayer/__init__.py
index fe54560..e69a10f 100644
--- a/poky/scripts/lib/checklayer/__init__.py
+++ b/poky/scripts/lib/checklayer/__init__.py
@@ -146,7 +146,7 @@
 
     return layers
 
-def _find_layer_depends(depend, layers):
+def _find_layer(depend, layers):
     for layer in layers:
         if 'collections' not in layer:
             continue
@@ -156,7 +156,7 @@
                 return layer
     return None
 
-def add_layer_dependencies(bblayersconf, layer, layers, logger):
+def get_layer_dependencies(layer, layers, logger):
     def recurse_dependencies(depends, layer, layers, logger, ret = []):
         logger.debug('Processing dependencies %s for layer %s.' % \
                     (depends, layer['name']))
@@ -166,7 +166,7 @@
             if depend == 'core':
                 continue
 
-            layer_depend = _find_layer_depends(depend, layers)
+            layer_depend = _find_layer(depend, layers)
             if not layer_depend:
                 logger.error('Layer %s depends on %s and isn\'t found.' % \
                         (layer['name'], depend))
@@ -203,6 +203,11 @@
         layer_depends = recurse_dependencies(depends, layer, layers, logger, layer_depends)
 
     # Note: [] (empty) is allowed, None is not!
+    return layer_depends
+
+def add_layer_dependencies(bblayersconf, layer, layers, logger):
+
+    layer_depends = get_layer_dependencies(layer, layers, logger)
     if layer_depends is None:
         return False
     else:
diff --git a/poky/scripts/lib/devtool/build_image.py b/poky/scripts/lib/devtool/build_image.py
index 9388abb..980f90d 100644
--- a/poky/scripts/lib/devtool/build_image.py
+++ b/poky/scripts/lib/devtool/build_image.py
@@ -113,7 +113,7 @@
                 with open(appendfile, 'w') as afile:
                     if packages:
                         # include packages from workspace recipes into the image
-                        afile.write('IMAGE_INSTALL_append = " %s"\n' % ' '.join(packages))
+                        afile.write('IMAGE_INSTALL:append = " %s"\n' % ' '.join(packages))
                         if not task:
                             logger.info('Building image %s with the following '
                                         'additional packages: %s', image, ' '.join(packages))
diff --git a/poky/scripts/lib/devtool/sdk.py b/poky/scripts/lib/devtool/sdk.py
index 3aa42a1..ae3fc4c 100644
--- a/poky/scripts/lib/devtool/sdk.py
+++ b/poky/scripts/lib/devtool/sdk.py
@@ -207,7 +207,7 @@
         if not sstate_mirrors:
             with open(os.path.join(conf_dir, 'site.conf'), 'a') as f:
                 f.write('SCONF_VERSION = "%s"\n' % site_conf_version)
-                f.write('SSTATE_MIRRORS_append = " file://.* %s/sstate-cache/PATH \\n "\n' % updateserver)
+                f.write('SSTATE_MIRRORS:append = " file://.* %s/sstate-cache/PATH \\n "\n' % updateserver)
     finally:
         shutil.rmtree(tmpsdk_dir)
 
diff --git a/poky/scripts/lib/devtool/search.py b/poky/scripts/lib/devtool/search.py
index d24040d..d81cdd8 100644
--- a/poky/scripts/lib/devtool/search.py
+++ b/poky/scripts/lib/devtool/search.py
@@ -65,7 +65,7 @@
                                         splitline = line.split(':', 1)
                                         key = splitline[0]
                                         value = splitline[1].strip()
-                                    if key in ['PKG_%s' % pkg, 'DESCRIPTION', 'FILES_INFO'] or key.startswith('FILERPROVIDES_'):
+                                    if key in ['PKG:%s' % pkg, 'DESCRIPTION', 'FILES_INFO'] or key.startswith('FILERPROVIDES_'):
                                         if keyword_rc.search(value):
                                             match = True
                                             break
diff --git a/poky/scripts/lib/devtool/standard.py b/poky/scripts/lib/devtool/standard.py
index 5eba219..b74a60d 100644
--- a/poky/scripts/lib/devtool/standard.py
+++ b/poky/scripts/lib/devtool/standard.py
@@ -254,13 +254,13 @@
                 f.write('\n# initial_rev: %s\n' % initial_rev)
 
             if args.binary:
-                f.write('do_install_append() {\n')
+                f.write('do_install:append() {\n')
                 f.write('    rm -rf ${D}/.git\n')
                 f.write('    rm -f ${D}/singletask.lock\n')
                 f.write('}\n')
 
             if bb.data.inherits_class('npm', rd):
-                f.write('python do_configure_append() {\n')
+                f.write('python do_configure:append() {\n')
                 f.write('    pkgdir = d.getVar("NPM_PACKAGE")\n')
                 f.write('    lockfile = os.path.join(pkgdir, "singletask.lock")\n')
                 f.write('    bb.utils.remove(lockfile)\n')
@@ -523,7 +523,7 @@
         history = d.varhistory.variable('SRC_URI')
         for event in history:
             if not 'flag' in event:
-                if event['op'].startswith(('_append[', '_prepend[')):
+                if event['op'].startswith((':append[', ':prepend[')):
                     extra_overrides.append(event['op'].split('[')[1].split(']')[0])
         # We want to remove duplicate overrides. If a recipe had multiple
         # SRC_URI_override += values it would cause mulitple instances of
@@ -936,36 +936,36 @@
 
         bb.utils.mkdirhier(os.path.dirname(appendfile))
         with open(appendfile, 'w') as f:
-            f.write('FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"\n')
+            f.write('FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"\n')
             # Local files can be modified/tracked in separate subdir under srctree
             # Mostly useful for packages with S != WORKDIR
-            f.write('FILESPATH_prepend := "%s:"\n' %
+            f.write('FILESPATH:prepend := "%s:"\n' %
                     os.path.join(srctreebase, 'oe-local-files'))
             f.write('# srctreebase: %s\n' % srctreebase)
 
             f.write('\ninherit 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))
+            f.write('EXTERNALSRC:pn-%s = "%s"\n' % (pn, srctree))
 
             b_is_s = use_external_build(args.same_dir, args.no_same_dir, rd)
             if b_is_s:
-                f.write('EXTERNALSRC_BUILD_pn-%s = "%s"\n' % (pn, srctree))
+                f.write('EXTERNALSRC_BUILD:pn-%s = "%s"\n' % (pn, srctree))
 
             if bb.data.inherits_class('kernel', rd):
                 f.write('SRCTREECOVEREDTASKS = "do_validate_branches do_kernel_checkout '
                         'do_fetch do_unpack do_kernel_configcheck"\n')
                 f.write('\ndo_patch[noexec] = "1"\n')
-                f.write('\ndo_configure_append() {\n'
+                f.write('\ndo_configure:append() {\n'
                         '    cp ${B}/.config ${S}/.config.baseline\n'
                         '    ln -sfT ${B}/.config ${S}/.config.new\n'
                         '}\n')
-                f.write('\ndo_kernel_configme_prepend() {\n'
+                f.write('\ndo_kernel_configme:prepend() {\n'
                         '    if [ -e ${S}/.config ]; then\n'
                         '        mv ${S}/.config ${S}/.config.old\n'
                         '    fi\n'
                         '}\n')
             if rd.getVarFlag('do_menuconfig','task'):
-                f.write('\ndo_configure_append() {\n'
+                f.write('\ndo_configure:append() {\n'
                 '    if [ ! ${DEVTOOL_DISABLE_MENUCONFIG} ]; then\n'
                 '        cp ${B}/.config ${S}/.config.baseline\n'
                 '        ln -sfT ${B}/.config ${S}/.config.new\n'
diff --git a/poky/scripts/lib/devtool/upgrade.py b/poky/scripts/lib/devtool/upgrade.py
index da1456a..826a3f9 100644
--- a/poky/scripts/lib/devtool/upgrade.py
+++ b/poky/scripts/lib/devtool/upgrade.py
@@ -103,14 +103,14 @@
     pn = d.getVar('PN')
     af = os.path.join(appendpath, '%s.bbappend' % brf)
     with open(af, 'w') as f:
-        f.write('FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"\n\n')
+        f.write('FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"\n\n')
         f.write('inherit externalsrc\n')
         f.write(('# NOTE: We use pn- overrides here to avoid affecting'
                  'multiple variants in the case where the recipe uses BBCLASSEXTEND\n'))
-        f.write('EXTERNALSRC_pn-%s = "%s"\n' % (pn, srctree))
+        f.write('EXTERNALSRC:pn-%s = "%s"\n' % (pn, srctree))
         b_is_s = use_external_build(same_dir, no_same_dir, d)
         if b_is_s:
-            f.write('EXTERNALSRC_BUILD_pn-%s = "%s"\n' % (pn, srctree))
+            f.write('EXTERNALSRC_BUILD:pn-%s = "%s"\n' % (pn, srctree))
         f.write('\n')
         if rev:
             f.write('# initial_rev: %s\n' % rev)
@@ -583,6 +583,9 @@
         logger.info('New recipe is %s' % rf)
         if license_diff:
             logger.info('License checksums have been updated in the new recipe; please refer to it for the difference between the old and the new license texts.')
+        preferred_version = rd.getVar('PREFERRED_VERSION_%s' % rd.getVar('PN'))
+        if preferred_version:
+            logger.warning('Version is pinned to %s via PREFERRED_VERSION; it may need adjustment to match the new version before any further steps are taken' % preferred_version)
     finally:
         tinfoil.shutdown()
     return 0
diff --git a/poky/scripts/lib/recipetool/append.py b/poky/scripts/lib/recipetool/append.py
index e9d52bb..5f629c0 100644
--- a/poky/scripts/lib/recipetool/append.py
+++ b/poky/scripts/lib/recipetool/append.py
@@ -49,7 +49,7 @@
                       '/etc/group': '/etc/group should be managed through the useradd and extrausers classes',
                       '/etc/shadow': '/etc/shadow should be managed through the useradd and extrausers classes',
                       '/etc/gshadow': '/etc/gshadow should be managed through the useradd and extrausers classes',
-                      '${sysconfdir}/hostname': '${sysconfdir}/hostname contents should be set by setting hostname_pn-base-files = "value" in configuration',}
+                      '${sysconfdir}/hostname': '${sysconfdir}/hostname contents should be set by setting hostname:pn-base-files = "value" in configuration',}
 
     for pthspec, message in invalidtargets.items():
         if fnmatch.fnmatchcase(targetpath, d.expand(pthspec)):
@@ -79,7 +79,7 @@
                         for fullpth in dictval.keys():
                             if fnmatch.fnmatchcase(fullpth, targetpath):
                                 recipes[targetpath].append(pn)
-                    elif line.startswith('pkg_preinst_') or line.startswith('pkg_postinst_'):
+                    elif line.startswith('pkg_preinst:') or line.startswith('pkg_postinst:'):
                         scriptval = line.split(':', 1)[1].strip().encode('utf-8').decode('unicode_escape')
                         if 'update-alternatives --install %s ' % targetpath in scriptval:
                             recipes[targetpath].append('?%s' % pn)
diff --git a/poky/scripts/lib/recipetool/create.py b/poky/scripts/lib/recipetool/create.py
index 566c753..0ac97e0 100644
--- a/poky/scripts/lib/recipetool/create.py
+++ b/poky/scripts/lib/recipetool/create.py
@@ -710,7 +710,7 @@
         lines_after.append('')
 
     if args.binary:
-        lines_after.append('INSANE_SKIP_${PN} += "already-stripped"')
+        lines_after.append('INSANE_SKIP:${PN} += "already-stripped"')
         lines_after.append('')
 
     if args.npm_dev:
@@ -1177,7 +1177,7 @@
         license = ' '.join(list(set(pkglicenses.get(pkgname, ['Unknown'])))) or 'Unknown'
         if license == 'Unknown' and pkgname in fallback_licenses:
             license = fallback_licenses[pkgname]
-        outlines.append('LICENSE_%s = "%s"' % (pkgname, license))
+        outlines.append('LICENSE:%s = "%s"' % (pkgname, license))
         outlicenses[pkgname] = license.split()
     return outlicenses
 
diff --git a/poky/scripts/lib/recipetool/create_buildsys_python.py b/poky/scripts/lib/recipetool/create_buildsys_python.py
index adfa377..fdd3366 100644
--- a/poky/scripts/lib/recipetool/create_buildsys_python.py
+++ b/poky/scripts/lib/recipetool/create_buildsys_python.py
@@ -45,9 +45,9 @@
         'Summary': 'SUMMARY',
         'Description': 'DESCRIPTION',
         'License': 'LICENSE',
-        'Requires': 'RDEPENDS_${PN}',
-        'Provides': 'RPROVIDES_${PN}',
-        'Obsoletes': 'RREPLACES_${PN}',
+        'Requires': 'RDEPENDS:${PN}',
+        'Provides': 'RPROVIDES:${PN}',
+        'Obsoletes': 'RREPLACES:${PN}',
     }
     # PN/PV are already set by recipetool core & desc can be extremely long
     excluded_fields = [
@@ -301,7 +301,7 @@
                 inst_req_deps = ('python3-' + r.replace('.', '-').lower() for r in sorted(inst_reqs))
                 lines_after.append('# WARNING: the following rdepends are from setuptools install_requires. These')
                 lines_after.append('# upstream names may not correspond exactly to bitbake package names.')
-                lines_after.append('RDEPENDS_${{PN}} += "{}"'.format(' '.join(inst_req_deps)))
+                lines_after.append('RDEPENDS:${{PN}} += "{}"'.format(' '.join(inst_req_deps)))
 
         if mapped_deps:
             name = info.get('Name')
@@ -313,7 +313,7 @@
                 lines_after.append('')
             lines_after.append('# WARNING: the following rdepends are determined through basic analysis of the')
             lines_after.append('# python sources, and might not be 100% accurate.')
-            lines_after.append('RDEPENDS_${{PN}} += "{}"'.format(' '.join(sorted(mapped_deps))))
+            lines_after.append('RDEPENDS:${{PN}} += "{}"'.format(' '.join(sorted(mapped_deps))))
 
         unmapped_deps -= set(extensions)
         unmapped_deps -= set(self.assume_provided)
diff --git a/poky/scripts/lib/recipetool/create_kmod.py b/poky/scripts/lib/recipetool/create_kmod.py
index 85b5c48..cc00106 100644
--- a/poky/scripts/lib/recipetool/create_kmod.py
+++ b/poky/scripts/lib/recipetool/create_kmod.py
@@ -113,7 +113,7 @@
                 kdirpath, _ = check_target(compile_lines, install=False)
 
             if manual_install or not install_lines:
-                lines_after.append('EXTRA_OEMAKE_append_task-install = " -C ${STAGING_KERNEL_DIR} M=${S}"')
+                lines_after.append('EXTRA_OEMAKE:append:task-install = " -C ${STAGING_KERNEL_DIR} M=${S}"')
             elif install_target and install_target != 'modules_install':
                 lines_after.append('MODULES_INSTALL_TARGET = "install"')
 
diff --git a/poky/scripts/oe-check-sstate b/poky/scripts/oe-check-sstate
index ca249ca..59bcb32 100755
--- a/poky/scripts/oe-check-sstate
+++ b/poky/scripts/oe-check-sstate
@@ -47,8 +47,8 @@
     try:
         env = os.environ.copy()
         if not args.same_tmpdir:
-            env['BB_ENV_EXTRAWHITE'] = env.get('BB_ENV_EXTRAWHITE', '') + ' TMPDIR_forcevariable'
-            env['TMPDIR_forcevariable'] = tmpdir
+            env['BB_ENV_EXTRAWHITE'] = env.get('BB_ENV_EXTRAWHITE', '') + ' TMPDIR:forcevariable'
+            env['TMPDIR:forcevariable'] = tmpdir
 
         try:
             output = subprocess.check_output(
diff --git a/poky/scripts/oe-debuginfod b/poky/scripts/oe-debuginfod
index 5560769..9e5482d 100755
--- a/poky/scripts/oe-debuginfod
+++ b/poky/scripts/oe-debuginfod
@@ -23,4 +23,4 @@
     subprocess.call(['bitbake', '-c', 'addto_recipe_sysroot', 'elfutils-native'])
 
     subprocess.call(['oe-run-native', 'elfutils-native', 'debuginfod', '--verbose', '-R', '-U', feed_dir])
-    print("\nTo use the debuginfod server please ensure that this variable PACKAGECONFIG_pn-elfutils-native = \"debuginfod libdebuginfod\" is set in the local.conf")
+    print("\nTo use the debuginfod server please ensure that this variable PACKAGECONFIG:pn-elfutils-native = \"debuginfod libdebuginfod\" is set in the local.conf")
diff --git a/poky/scripts/oe-pkgdata-util b/poky/scripts/oe-pkgdata-util
index 75dd23e..94d4400 100755
--- a/poky/scripts/oe-pkgdata-util
+++ b/poky/scripts/oe-pkgdata-util
@@ -96,7 +96,7 @@
                 pn = os.path.basename(pkgdata_file)
                 with open(pkgdata_file, 'r') as f:
                     for line in f:
-                        if line.startswith("PKG_%s:" % pn):
+                        if line.startswith("PKG:%s:" % pn):
                             renamed = line.split(': ')[1].rstrip()
                 return renamed
 
@@ -213,7 +213,7 @@
                 with open(pkgfile, 'r') as f:
                     for line in f:
                         fields = line.rstrip().split(': ')
-                        if fields[0] == 'PKG_%s' % pkg:
+                        if fields[0] == 'PKG:%s' % pkg:
                             mappings[pkg].append(fields[1])
                             break
     return mappings
diff --git a/poky/scripts/oe-setup-builddir b/poky/scripts/oe-setup-builddir
index 30eaa8e..5a51fa7 100755
--- a/poky/scripts/oe-setup-builddir
+++ b/poky/scripts/oe-setup-builddir
@@ -113,10 +113,10 @@
     cat <<EOM
 The Yocto Project has extensive documentation about OE including a reference
 manual which can be found at:
-    http://yoctoproject.org/documentation
+    https://docs.yoctoproject.org
 
 For more information about OpenEmbedded see their website:
-    http://www.openembedded.org/
+    https://www.openembedded.org/
 
 EOM
 #    unset SHOWYPDOC
diff --git a/poky/scripts/runqemu b/poky/scripts/runqemu
index 2914f15..0976273 100755
--- a/poky/scripts/runqemu
+++ b/poky/scripts/runqemu
@@ -776,7 +776,7 @@
                 raise RunQemuError('BIOS not found: %s' % bios_match_name)
 
         if not os.path.exists(self.bios):
-            raise RunQemuError("KERNEL %s not found" % self.bios)
+            raise RunQemuError("BIOS %s not found" % self.bios)
 
 
     def check_mem(self):
@@ -1443,12 +1443,14 @@
             kernel_opts = "-kernel %s -append '%s %s %s %s'" % (self.kernel, self.kernel_cmdline,
                                                                 self.kernel_cmdline_script, self.get('QB_KERNEL_CMDLINE_APPEND'),
                                                                 self.bootparams)
-            if self.bios:
-                kernel_opts += " -bios %s" % self.bios
             if self.dtb:
                 kernel_opts += " -dtb %s" % self.dtb
         else:
             kernel_opts = ""
+
+        if self.bios:
+            self.qemu_opt += " -bios %s" % self.bios
+
         cmd = "%s %s" % (self.qemu_opt, kernel_opts)
         cmds = shlex.split(cmd)
         logger.info('Running %s\n' % cmd)
diff --git a/poky/scripts/yocto-check-layer b/poky/scripts/yocto-check-layer
index 44e77b7..2445ad5 100755
--- a/poky/scripts/yocto-check-layer
+++ b/poky/scripts/yocto-check-layer
@@ -24,7 +24,7 @@
 scriptpath.add_oe_lib_path()
 scriptpath.add_bitbake_lib_path()
 
-from checklayer import LayerType, detect_layers, add_layers, add_layer_dependencies, get_signatures, check_bblayers
+from checklayer import LayerType, detect_layers, add_layers, add_layer_dependencies, get_layer_dependencies, get_signatures, check_bblayers
 from oeqa.utils.commands import get_bb_vars
 
 PROGNAME = 'yocto-check-layer'
@@ -51,6 +51,8 @@
             help='File to output log (optional)', action='store')
     parser.add_argument('--dependency', nargs="+",
             help='Layers to process for dependencies', action='store')
+    parser.add_argument('--no-auto-dependency', help='Disable automatic testing of dependencies',
+            action='store_true')
     parser.add_argument('--machines', nargs="+",
             help='List of MACHINEs to be used during testing', action='store')
     parser.add_argument('--additional-layers', nargs="+",
@@ -121,6 +123,21 @@
     if not layers:
         return 1
 
+    # Find all dependencies, and get them checked too
+    if not args.no_auto_dependency:
+        depends = []
+        for layer in layers:
+            layer_depends = get_layer_dependencies(layer, dep_layers, logger)
+            if layer_depends:
+                for d in layer_depends:
+                    if d not in depends:
+                        depends.append(d)
+
+        for d in depends:
+            if d not in layers:
+                logger.info("Adding %s to the list of layers to test, as a dependency", d['name'])
+                layers.append(d)
+
     shutil.copyfile(bblayersconf, bblayersconf + '.backup')
     def cleanup_bblayers(signum, frame):
         shutil.copyfile(bblayersconf + '.backup', bblayersconf)
@@ -152,17 +169,13 @@
         logger.info("Setting up for %s(%s), %s" % (layer['name'], layer['type'],
             layer['path']))
 
-        shutil.copyfile(bblayersconf + '.backup', bblayersconf)
-
         missing_dependencies = not add_layer_dependencies(bblayersconf, layer, dep_layers, logger)
         if not missing_dependencies:
             for additional_layer in additional_layers:
                 if not add_layer_dependencies(bblayersconf, additional_layer, dep_layers, logger):
                     missing_dependencies = True
                     break
-        if not add_layer_dependencies(bblayersconf, layer, dep_layers, logger) or \
-           any(map(lambda additional_layer: not add_layer_dependencies(bblayersconf, additional_layer, dep_layers, logger),
-                   additional_layers)):
+        if missing_dependencies:
             logger.info('Skipping %s due to missing dependencies.' % layer['name'])
             results[layer['name']] = None
             results_status[layer['name']] = 'SKIPPED (Missing dependencies)'