diff --git a/scripts/lib/bsp/engine.py b/scripts/lib/bsp/engine.py
index 55f1e6b43e..86cb51c5f4 100644
--- a/scripts/lib/bsp/engine.py
+++ b/scripts/lib/bsp/engine.py
@@ -1741,3 +1741,39 @@ def map_standard_kbranch(need_new_kbranch, new_kbranch, existing_kbranch):
         return "bsp/common-pc/common-pc-standard.scc"
     else:
         return "ktypes/standard/standard.scc"
+
+
+def map_preempt_rt_kbranch(need_new_kbranch, new_kbranch, existing_kbranch):
+    """
+    Return the linux-yocto bsp branch to use with the specified
+    kbranch.  This handles the -preempt-rt variants for 3.4 and 3.8;
+    the other variants don't need mappings.
+    """
+    if need_new_kbranch == "y":
+        kbranch = new_kbranch
+    else:
+        kbranch = existing_kbranch
+
+    if kbranch.startswith("standard/preempt-rt/common-pc-64"):
+        return "bsp/common-pc-64/common-pc-64-preempt-rt.scc"
+    if kbranch.startswith("standard/preempt-rt/common-pc"):
+        return "bsp/common-pc/common-pc-preempt-rt.scc"
+    else:
+        return "ktypes/preempt-rt/preempt-rt.scc"
+
+
+def map_tiny_kbranch(need_new_kbranch, new_kbranch, existing_kbranch):
+    """
+    Return the linux-yocto bsp branch to use with the specified
+    kbranch.  This handles the -tiny variants for 3.4 and 3.8; the
+    other variants don't need mappings.
+    """
+    if need_new_kbranch == "y":
+        kbranch = new_kbranch
+    else:
+        kbranch = existing_kbranch
+
+    if kbranch.startswith("standard/tiny/common-pc"):
+        return "bsp/common-pc/common-pc-tiny.scc"
+    else:
+        return "ktypes/tiny/tiny.scc"