diff --git a/boottest.py b/boottest.py
index 1f576ba..1631080 100644
--- a/boottest.py
+++ b/boottest.py
@@ -75,6 +75,8 @@ class BootTest(object):
         "RUNNING": '<span style="background:#99ddff">Test in progress</span>',
     }
 
+    ARCHITECTURES = ('all', 'armhf')
+
     def __init__(self, britney, distribution, series, debug=False):
         self.britney = britney
         self.distribution = distribution
@@ -107,12 +109,16 @@ class BootTest(object):
         """
         # Discover all binaries for the 'excused' source.
         unstable_sources = self.britney.sources['unstable']
+        # Dismiss if source is not yet recognized (??).
+        if excuse.name not in unstable_sources:
+            raise StopIteration
         # XXX cprov 20150120: binaries are a seq of "<binname>/<arch>" and,
         # practically, boottest is only concerned about armhf+all binaries.
         # Anything else should be skipped.
         binary_names = [
-            bin.split('/')[0]
-            for bin in unstable_sources[excuse.name][BINARIES]
+            b.split('/')[0]
+            for b in unstable_sources[excuse.name][BINARIES]
+            if b.split('/')[1] in self.ARCHITECTURES
         ]
 
         # Process (request or update) boottest attempts for each binary.
diff --git a/britney.py b/britney.py
index b9c182d..2b98eb4 100755
--- a/britney.py
+++ b/britney.py
@@ -1897,18 +1897,27 @@ class Britney(object):
                 # Skip already invalid excuses.
                 if not excuse.is_valid:
                     continue
+                # Also skip removals, binary-only candidates, proposed-updates
+                # and unknown versions.
+                if (e.name.startswith("-") or
+                    "/" in e.name or
+                    "_" in e.name or
+                    e.ver[1] == "-"):
+                    continue
                 statuses = set()
-                # Update valid excuses from the boottest context and if they
-                # have failed, block their migration.
+                # Update valid excuses from the boottest context.
                 for binary_name, status in boottest.update(excuse):
                     label = BootTest.EXCUSE_LABELS.get(
                         status, 'UNKNOWN STATUS')
                     excuse.addhtml("boottest for %s %s: %s" %
                                    (binary_name, excuse.ver[1], label))
                     statuses.add(status)
-                # If all boottests passed or were skipped, the excuse is
-                # clean and promotion can proceed, according to the
-                # boottest criteria. Otherwise block the promotion.
+                # No boottest attemps requested, it's not relevant in this
+                # context, rely on other checks to judge promotion.
+                if not statuses:
+                    continue
+                # Block promotion if any boottests attempt has failed or
+                # still in progress.
                 if not statuses.issubset(set(BootTest.VALID_STATUSES)):
                     excuse.addhtml("Not considered")
                     excuse.addreason("boottest")
diff --git a/tests/test_boottest.py b/tests/test_boottest.py
index c15d0ed..2b80de6 100644
--- a/tests/test_boottest.py
+++ b/tests/test_boottest.py
@@ -76,15 +76,18 @@ class TestBoottestEnd2End(TestBase):
         super(TestBoottestEnd2End, self).setUp()
         self.britney_conf = os.path.join(
             PROJECT_DIR, 'britney_boottest.conf')
-        self.data.add('libc6', False)
+        self.data.add('libc6', False, {'Architecture': 'armhf'}),
+
         self.data.add(
             'libgreen1',
             False,
-            {'Source': 'green', 'Depends': 'libc6 (>= 0.9)'})
+            {'Source': 'green', 'Architecture': 'armhf',
+             'Depends': 'libc6 (>= 0.9)'})
         self.data.add(
             'green',
             False,
-            {'Source': 'green', 'Depends': 'libc6 (>= 0.9), libgreen1'})
+            {'Source': 'green', 'Architecture': 'armhf',
+             'Depends': 'libc6 (>= 0.9), libgreen1'})
         self.create_manifest([
             'green 1.0',
             'pyqt5:armhf 1.0',
@@ -117,8 +120,9 @@ class TestBoottestEnd2End(TestBase):
         # 'in progress' tests blocks package promotion.
         context = [
             ('green', {'Source': 'green', 'Version': '1.1~beta',
-                       'Depends': 'libc6 (>= 0.9)'}),
+                       'Architecture': 'armhf', 'Depends': 'libc6 (>= 0.9)'}),
             ('libgreen1', {'Source': 'green', 'Version': '1.1~beta',
+                           'Architecture': 'armhf',
                            'Depends': 'libc6 (>= 0.9)'}),
         ]
         self.do_test(
@@ -136,7 +140,8 @@ class TestBoottestEnd2End(TestBase):
         # promotion.
         context = []
         context.append(
-            ('pyqt5', {'Source': 'pyqt5-src', 'Version': '1.1~beta'}))
+            ('pyqt5', {'Source': 'pyqt5-src', 'Version': '1.1~beta',
+                       'Architecture': 'all'}))
         self.do_test(
             context,
             [r'\bpyqt5-src\b.*\(- to .*>1.1~beta<',
@@ -150,7 +155,8 @@ class TestBoottestEnd2End(TestBase):
         # ('Not considered.')
         context = []
         context.append(
-            ('pyqt5', {'Source': 'pyqt5-src', 'Version': '1.1'}))
+            ('pyqt5', {'Source': 'pyqt5-src', 'Version': '1.1',
+                       'Architecture': 'all'}))
         self.do_test(
             context,
             [r'\bpyqt5-src\b.*\(- to .*>1.1<',
@@ -158,13 +164,13 @@ class TestBoottestEnd2End(TestBase):
                  BootTest.EXCUSE_LABELS['FAIL']),
              '<li>Not considered'])
 
-    def test_skipped(self):
+    def test_skipped_not_on_phone(self):
         # `Britney` updates boottesting information in excuses when the
         # package was skipped and marks the package as a valid candidate for
         # promotion.
         context = []
         context.append(
-            ('apache2', {'Source': 'apache2-src',
+            ('apache2', {'Source': 'apache2-src', 'Architecture': 'all',
                          'Version': '2.4.8-1ubuntu1'}))
         self.do_test(
             context,
@@ -173,6 +179,22 @@ class TestBoottestEnd2End(TestBase):
                  BootTest.EXCUSE_LABELS['SKIPPED']),
              '<li>Valid candidate'])
 
+    def test_skipped_architecture_not_allowed(self):
+        # `Britney` does not trigger boottests for source not yet built on
+        # the allowed architectures.
+        self.data.add(
+            'pyqt5', False, {'Source': 'pyqt5-src', 'Architecture': 'armhf'})
+        context = [
+            ('pyqt5', {'Source': 'pyqt5-src', 'Version': '1.1',
+                       'Architecture': 'amd64'}),
+        ]
+        self.do_test(
+            context,
+            [r'\bpyqt5-src\b.*>1</a> to .*>1.1<',
+             r'<li>missing build on .*>armhf</a>: pyqt5 \(from .*>1</a>\)',
+             '<li>Not considered'])
+
+
 
 if __name__ == '__main__':
     unittest.main()