diff --git a/meta-arm/scripts/machine-summary.py b/meta-arm/scripts/machine-summary.py
new file mode 100755
index 0000000..c2b43da
--- /dev/null
+++ b/meta-arm/scripts/machine-summary.py
@@ -0,0 +1,232 @@
+#! /usr/bin/env python3
+
+import argparse
+import datetime
+import os
+import pathlib
+import re
+import sys
+
+import jinja2
+
+def trim_pv(pv):
+    """
+    Strip anything after +git from the PV
+    """
+    return "".join(pv.partition("+git")[:2])
+
+def needs_update(version, upstream):
+    """
+    Do a dumb comparison to determine if the version needs to be updated.
+    """
+    if "+git" in version:
+        # strip +git and see if this is a post-release snapshot
+        version = version.replace("+git", "")
+    return version != upstream
+
+def safe_patches(patches):
+    for info in patches:
+        if info["status"] in ("Denied", "Pending", "Unknown"):
+            return False
+    return True
+
+def layer_path(layername: str, d) -> pathlib.Path:
+    """
+    Return the path to the specified layer, or None if the layer isn't present.
+    """
+    if not hasattr(layer_path, "cache"):
+        # Don't use functools.lru_cache as we don't want d changing to invalidate the cache
+        layer_path.cache = {}
+
+    if layername in layer_path.cache:
+        return layer_path.cache[layername]
+
+    bbpath = d.getVar("BBPATH").split(":")
+    pattern = d.getVar('BBFILE_PATTERN_' + layername)
+    for path in reversed(sorted(bbpath)):
+        if re.match(pattern, path + "/"):
+            layer_path.cache[layername] = pathlib.Path(path)
+            return layer_path.cache[layername]
+    return None
+
+def get_url_for_patch(layer: str, localpath: pathlib.Path, d) -> str:
+    relative = localpath.relative_to(layer_path(layer, d))
+
+    # TODO: use layerindexlib
+    # TODO: assumes default branch
+    if layer == "core":
+        return f"https://git.openembedded.org/openembedded-core/tree/meta/{relative}"
+    elif layer in ("meta-arm", "meta-arm-bsp", "arm-toolchain", "meta-atp", "meta-gem5"):
+        return f"https://git.yoctoproject.org/meta-arm/tree/{layer}/{relative}"
+    else:
+        print(f"WARNING: Don't know web URL for layer {layer}", file=sys.stderr)
+        return None
+
+def extract_patch_info(src_uri, d):
+    """
+    Parse the specified patch entry from a SRC_URI and return (base name, layer name, status) tuple
+    """
+    import bb.fetch, bb.utils
+
+    info = {}
+    localpath = pathlib.Path(bb.fetch.decodeurl(src_uri)[2])
+    info["name"] = localpath.name
+    info["layer"] = bb.utils.get_file_layer(str(localpath), d)
+    info["url"] = get_url_for_patch(info["layer"], localpath, d)
+
+    status = "Unknown"
+    with open(localpath, errors="ignore") as f:
+        m = re.search(r"^[\t ]*Upstream[-_ ]Status:?[\t ]*(\w*)", f.read(), re.IGNORECASE | re.MULTILINE)
+        if m:
+            # TODO: validate
+            status = m.group(1)
+    info["status"] = status
+    return info
+
+def harvest_data(machines, recipes):
+    import bb.tinfoil
+    with bb.tinfoil.Tinfoil() as tinfoil:
+        tinfoil.prepare(config_only=True)
+        corepath = layer_path("core", tinfoil.config_data)
+        sys.path.append(os.path.join(corepath, "lib"))
+    import oe.recipeutils
+    import oe.patch
+
+    # Queue of recipes that we're still looking for upstream releases for
+    to_check = list(recipes)
+
+    # Upstream releases
+    upstreams = {}
+    # Machines to recipes to versions
+    versions = {}
+
+    for machine in machines:
+        print(f"Gathering data for {machine}...")
+        os.environ["MACHINE"] = machine
+        with bb.tinfoil.Tinfoil() as tinfoil:
+            versions[machine] = {}
+
+            tinfoil.prepare(quiet=2)
+            for recipe in recipes:
+                try:
+                    d = tinfoil.parse_recipe(recipe)
+                except bb.providers.NoProvider:
+                    continue
+
+                if recipe in to_check:
+                    try:
+                        info = oe.recipeutils.get_recipe_upstream_version(d)
+                        upstreams[recipe] = info["version"]
+                        to_check.remove(recipe)
+                    except (bb.providers.NoProvider, KeyError):
+                        pass
+
+                details = versions[machine][recipe] = {}
+                details["recipe"] = d.getVar("PN")
+                details["version"] = trim_pv(d.getVar("PV"))
+                details["fullversion"] = d.getVar("PV")
+                details["patches"] = [extract_patch_info(p, d) for p in oe.patch.src_patches(d)]
+                details["patched"] = bool(details["patches"])
+                details["patches_safe"] = safe_patches(details["patches"])
+
+    # Now backfill the upstream versions
+    for machine in versions:
+        for recipe in versions[machine]:
+            data = versions[machine][recipe]
+            data["upstream"] = upstreams[recipe]
+            data["needs_update"] = needs_update(data["version"], data["upstream"])
+    return upstreams, versions
+
+# TODO can this be inferred from the list of recipes in the layer
+recipes = ("virtual/kernel",
+           "scp-firmware",
+           "trusted-firmware-a",
+           "trusted-firmware-m",
+           "edk2-firmware",
+           "u-boot",
+           "optee-os",
+           "gcc-aarch64-none-elf-native",
+           "gcc-arm-none-eabi-native")
+
+
+class Format:
+    """
+    The name of this format
+    """
+    name = None
+    """
+    Registry of names to classes
+    """
+    registry = {}
+
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        assert cls.name
+        cls.registry[cls.name] = cls
+
+    @classmethod
+    def get_format(cls, name):
+        return cls.registry[name]()
+
+    def render(self, context, output: pathlib.Path):
+        pass
+
+    def get_template(self, name):
+        template_dir = os.path.dirname(os.path.abspath(__file__))
+        env = jinja2.Environment(
+            loader=jinja2.FileSystemLoader(template_dir),
+            extensions=['jinja2.ext.i18n'],
+            autoescape=jinja2.select_autoescape(),
+            trim_blocks=True,
+            lstrip_blocks=True
+        )
+
+        # We only need i18n for plurals
+        env.install_null_translations()
+
+        return env.get_template(name)
+
+class TextOverview(Format):
+    name = "overview.txt"
+
+    def render(self, context, output: pathlib.Path):
+        with open(output, "wt") as f:
+            f.write(self.get_template(f"machine-summary-overview.txt.jinja").render(context))
+
+class HtmlUpdates(Format):
+    name = "report"
+
+    def render(self, context, output: pathlib.Path):
+        if output.exists() and not output.is_dir():
+            print(f"{output} is not a directory", file=sys.stderr)
+            sys.exit(1)
+
+        if not output.exists():
+            output.mkdir(parents=True)
+
+        with open(output / "index.html", "wt") as f:
+            f.write(self.get_template(f"report-index.html.jinja").render(context))
+
+        subcontext = context.copy()
+        del subcontext["data"]
+        for machine, subdata in context["data"].items():
+            subcontext["machine"] = machine
+            subcontext["data"] = subdata
+            with open(output / f"{machine}.html", "wt") as f:
+                f.write(self.get_template(f"report-details.html.jinja").render(subcontext))
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="machine-summary")
+    parser.add_argument("machines", nargs="+", help="machine names", metavar="MACHINE")
+    parser.add_argument("-t", "--type", required=True, choices=Format.registry.keys())
+    parser.add_argument("-o", "--output", type=pathlib.Path, required=True)
+    args = parser.parse_args()
+
+    context = {}
+    # TODO: include git describe for meta-arm
+    context["timestamp"] = str(datetime.datetime.now().strftime("%c"))
+    context["recipes"] = sorted(recipes)
+    context["releases"], context["data"] = harvest_data(args.machines, recipes)
+
+    formatter = Format.get_format(args.type)
+    formatter.render(context, args.output)