diff --git a/components/bt/linker.lf b/components/bt/linker.lf
index 72afd4d2e0..debff10af3 100644
--- a/components/bt/linker.lf
+++ b/components/bt/linker.lf
@@ -24,12 +24,13 @@ entries:
 [mapping:bt]
 archive: libbt.a
 entries:
-    * (bt_start_end);
-        bt_bss -> dram0_bss ALIGN(4) ALIGN(4, post) SURROUND(bt_bss),
-        bt_common -> dram0_bss ALIGN(4) ALIGN(4, post) SURROUND(bt_common),
-        data -> dram0_data  ALIGN(4) ALIGN(4, post) SURROUND(bt_data)
     if ESP_ALLOW_BSS_SEG_EXTERNAL_MEMORY = y:
         * (extram_bss)
+    else:
+        * (bt_start_end);
+            bt_bss -> dram0_bss ALIGN(4) ALIGN(4, post) SURROUND(bt_bss),
+            bt_common -> dram0_bss ALIGN(4) ALIGN(4, post) SURROUND(bt_common),
+            data -> dram0_data  ALIGN(4) ALIGN(4, post) SURROUND(bt_data)
 
 [mapping:btdm]
 archive: libbtdm_app.a
diff --git a/tools/ldgen/ldgen/generation.py b/tools/ldgen/ldgen/generation.py
index 2b67dec896..a2743e7424 100644
--- a/tools/ldgen/ldgen/generation.py
+++ b/tools/ldgen/ldgen/generation.py
@@ -471,7 +471,7 @@ class Generation:
 
                         sections_str = get_section_strs(section)
 
-                        key = (entity, section.name)
+                        key = (entity, sections_str)
 
                         try:
                             existing = entity_mappings[key]
diff --git a/tools/ldgen/test/test_generation.py b/tools/ldgen/test/test_generation.py
index 2ccfd7d70b..086fad43fa 100755
--- a/tools/ldgen/test/test_generation.py
+++ b/tools/ldgen/test/test_generation.py
@@ -782,6 +782,31 @@ entries:
         with self.assertRaises(GenerationException):
             self.generation.generate(self.entities)
 
+    def test_same_entity_conflicting_section(self):
+        # Test same entity being mapped by scheme conflicting with another.
+        #
+        # custom_rtc = .text -> rtc_text
+        # noflash = .text -> iram0_text, .rodata -> dram0_data
+        #
+        # This operation should fail.
+        mapping = u"""
+[sections:custom_text]
+entries:
+    .text+
+    .literal+
+
+[scheme:custom_rtc]
+entries:
+    custom_text -> rtc_text
+
+[mapping:test]
+archive: libfreertos.a
+entries:
+    croutine (noflash)                              #1
+    croutine (custom_rtc)                           #2
+"""
+        self.test_same_entity_conflicting_scheme(mapping)
+
     def test_complex_mapping_case(self, alt=None):
         # Test a complex case where an object is mapped using
         # one scheme, but a specific symbol in that object is mapped