diff --git a/tools/ldgen/ldgen/generation.py b/tools/ldgen/ldgen/generation.py
index 084198deca..794149aec8 100644
--- a/tools/ldgen/ldgen/generation.py
+++ b/tools/ldgen/ldgen/generation.py
@@ -1,5 +1,5 @@
 #
-# SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 #
 import collections
@@ -83,11 +83,13 @@ class Placement:
         #
         # Placement can also be a basis if it has flags
         # (self.flags) or its basis has flags (self.basis.flags)
-        significant = (not self.basis or
-                       self.target != self.basis.target or
-                       (self.flags and not self.basis.flags) or
-                       (not self.flags and self.basis.flags) or
-                       self.force)
+        significant = (
+            not self.basis
+            or self.target != self.basis.target
+            or (self.flags and not self.basis.flags)
+            or (not self.flags and self.basis.flags)
+            or self.force
+        )
 
         if significant and not self.explicit and not self.sections:
             # The placement is significant, but it is an intermediate placement
@@ -155,7 +157,7 @@ class EntityNode:
         assert name and name != Entity.ALL
 
         child = [c for c in self.children if c.name == name]
-        assert (len(child) <= 1)
+        assert len(child) <= 1
 
         if not child:
             child = self.child_t(self, name)
@@ -169,7 +171,7 @@ class EntityNode:
         commands = collections.defaultdict(list)
 
         def process_commands(cmds):
-            for (target, commands_list) in cmds.items():
+            for target, commands_list in cmds.items():
                 commands[target].extend(commands_list)
 
         # Process the commands generated from this node
@@ -221,16 +223,28 @@ class EntityNode:
                 placement_sections = frozenset(placement.sections)
                 command_sections = sections if sections == placement_sections else placement_sections
 
-                command = InputSectionDesc(placement.node.entity, command_sections,
-                                           [e.node.entity for e in placement.exclusions], keep, sort, tied)
+                command = InputSectionDesc(
+                    placement.node.entity,
+                    command_sections,
+                    [e.node.entity for e in placement.exclusions],
+                    keep,
+                    sort,
+                    tied,
+                )
                 commands[placement.target].append(command)
 
                 # Generate commands for intermediate, non-explicit exclusion placements here,
                 # so that they can be enclosed by flags that affect the parent placement.
                 for subplacement in placement.subplacements:
                     if not subplacement.flags and not subplacement.explicit:
-                        command = InputSectionDesc(subplacement.node.entity, subplacement.sections,
-                                                   [e.node.entity for e in subplacement.exclusions], keep, sort, tied)
+                        command = InputSectionDesc(
+                            subplacement.node.entity,
+                            subplacement.sections,
+                            [e.node.entity for e in subplacement.exclusions],
+                            keep,
+                            sort,
+                            tied,
+                        )
                         commands[placement.target].append(command)
 
                 for flag in surround_type:
@@ -319,7 +333,7 @@ class ObjectNode(EntityNode):
 
             if obj_sections:
                 symbol = entity.symbol
-                remove_sections = [s.replace('.*', '.%s' % symbol) for s in sections if '.*' in s]
+                remove_sections = [s.replace('.*', f'.{symbol}') for s in sections if '.*' in s]
                 # As part of IPA optimization, the compiler may perform
                 # constant propagation and generate specialized versions of a
                 # function. For example, for the function spiflash_start_core,
@@ -417,7 +431,7 @@ class Generation:
         for scheme in self.schemes.values():
             sections_bucket = collections.defaultdict(list)
 
-            for (sections_name, target_name) in scheme.entries:
+            for sections_name, target_name in scheme.entries:
                 # Get the sections under the bucket 'target_name'. If this bucket does not exist
                 # is created automatically
                 sections_in_bucket = sections_bucket[target_name]
@@ -433,7 +447,7 @@ class Generation:
             scheme_dictionary[scheme.name] = sections_bucket
 
         # Search for and raise exception on first instance of sections mapped to multiple targets
-        for (scheme_name, sections_bucket) in scheme_dictionary.items():
+        for scheme_name, sections_bucket in scheme_dictionary.items():
             for sections_a, sections_b in itertools.combinations(sections_bucket.values(), 2):
                 set_a = set()
                 set_b = set()
@@ -466,15 +480,17 @@ class Generation:
         for mapping in self.mappings.values():
             archive = mapping.archive
 
-            for (obj, symbol, scheme_name) in mapping.entries:
+            for obj, symbol, scheme_name in mapping.entries:
                 entity = Entity(archive, obj, symbol)
 
                 # Check the entity exists
-                if (self.check_mappings
-                        and entity.specificity.value > Entity.Specificity.ARCHIVE.value
-                        and mapping.name not in self.check_mapping_exceptions):
+                if (
+                    self.check_mappings
+                    and entity.specificity.value > Entity.Specificity.ARCHIVE.value
+                    and mapping.name not in self.check_mapping_exceptions
+                ):
                     if not entities.check_exists(entity):
-                        message = "'%s' not found" % str(entity)
+                        message = f"'{entity}' not found"
                         raise GenerationException(message, mapping)
 
                 if (obj, symbol, scheme_name) in mapping.flags.keys():
@@ -482,16 +498,16 @@ class Generation:
                     # Check if all section->target defined in the current
                     # scheme.
                     for flag in flags:
-                        if (flag.target not in scheme_dictionary[scheme_name].keys()
-                                or flag.section not in
-                                [_s.name for _s in scheme_dictionary[scheme_name][flag.target]]):
-                            message = "%s->%s not defined in scheme '%s'" % (flag.section, flag.target, scheme_name)
+                        if flag.target not in scheme_dictionary[scheme_name].keys() or flag.section not in [
+                            _s.name for _s in scheme_dictionary[scheme_name][flag.target]
+                        ]:
+                            message = f"{flag.section}->{flag.target} not defined in scheme '{scheme_name}'"
                             raise GenerationException(message, mapping)
                 else:
                     flags = None
 
                 # Create placement for each 'section -> target' in the scheme.
-                for (target, sections) in scheme_dictionary[scheme_name].items():
+                for target, sections in scheme_dictionary[scheme_name].items():
                     for section in sections:
                         # Find the applicable flags
                         _flags = []
@@ -522,9 +538,9 @@ class Generation:
                             if _flags or existing.flags:
                                 if (_flags and not existing.flags) or (not _flags and existing.flags):
                                     _flags.extend(existing.flags)
-                                    entity_mappings[key] = Generation.EntityMapping(entity,
-                                                                                    sections_str,
-                                                                                    target, _flags)
+                                    entity_mappings[key] = Generation.EntityMapping(
+                                        entity, sections_str, target, _flags
+                                    )
                                 elif _flags == existing.flags:
                                     pass
                                 else:
@@ -565,8 +581,7 @@ class Generation:
             if fragment.name in dict_to_append_to:
                 stored = dict_to_append_to[fragment.name].path
                 new = fragment.path
-                message = "Duplicate definition of fragment '%s' found in %s and %s." % (
-                    fragment.name, stored, new)
+                message = f"Duplicate definition of fragment '{fragment.name}' found in {stored} and {new}."
                 raise GenerationException(message)
 
             dict_to_append_to[fragment.name] = fragment
@@ -586,6 +601,6 @@ class GenerationException(LdGenFailure):
 
     def __str__(self):
         if self.fragment:
-            return "%s\nIn fragment '%s' defined in '%s'." % (self.message, self.fragment.name, self.fragment.path)
+            return f"{self.message}\nIn fragment '{self.fragment.name}' defined in '{self.fragment.path}'."
         else:
             return self.message
diff --git a/tools/ldgen/test/test_generation.py b/tools/ldgen/test/test_generation.py
index 7146cc09a7..b4ea0588c2 100755
--- a/tools/ldgen/test/test_generation.py
+++ b/tools/ldgen/test/test_generation.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 #
 import collections
@@ -12,19 +12,27 @@ import unittest
 from io import StringIO
 
 try:
-    from ldgen.entity import Entity, EntityDB
+    from ldgen.entity import Entity
+    from ldgen.entity import EntityDB
     from ldgen.fragments import parse_fragment_file
-    from ldgen.generation import Generation, GenerationException
+    from ldgen.generation import Generation
+    from ldgen.generation import GenerationException
     from ldgen.linker_script import LinkerScript
-    from ldgen.output_commands import AlignAtAddress, InputSectionDesc, SymbolAtAddress
+    from ldgen.output_commands import AlignAtAddress
+    from ldgen.output_commands import InputSectionDesc
+    from ldgen.output_commands import SymbolAtAddress
     from ldgen.sdkconfig import SDKConfig
 except ImportError:
     sys.path.append(os.path.dirname(os.path.dirname(__file__)))
-    from ldgen.entity import Entity, EntityDB
+    from ldgen.entity import Entity
+    from ldgen.entity import EntityDB
     from ldgen.fragments import parse_fragment_file
-    from ldgen.generation import Generation, GenerationException
+    from ldgen.generation import Generation
+    from ldgen.generation import GenerationException
     from ldgen.linker_script import LinkerScript
-    from ldgen.output_commands import AlignAtAddress, InputSectionDesc, SymbolAtAddress
+    from ldgen.output_commands import AlignAtAddress
+    from ldgen.output_commands import InputSectionDesc
+    from ldgen.output_commands import SymbolAtAddress
     from ldgen.sdkconfig import SDKConfig
 
 ROOT = Entity('*')
@@ -39,7 +47,6 @@ FREERTOS2 = Entity('libfreertos2.a')
 
 
 class GenerationTest(unittest.TestCase):
-
     def setUp(self):
         self.generation = Generation()
         self.entities = None
@@ -125,7 +132,6 @@ class GenerationTest(unittest.TestCase):
 
 
 class DefaultMappingTest(GenerationTest):
-
     def test_rule_generation_default(self):
         # Checks that default rules are generated from
         # the default scheme properly and even if no mappings
@@ -138,7 +144,7 @@ class DefaultMappingTest(GenerationTest):
     def test_default_mapping_lib(self):
         # Mapping a library with default mapping. This should not emit additional rules,
         # other than the default ones.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -150,7 +156,7 @@ entries:
     def test_default_mapping_obj(self):
         # Mapping an object with default mapping. This should not emit additional rules,
         # other than the default ones.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -162,7 +168,7 @@ entries:
     def test_default_mapping_symbol(self):
         # Mapping a symbol with default mapping. This should not emit additional rules,
         # other than the default ones.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -174,7 +180,7 @@ entries:
     def test_default_mapping_all(self):
         # Mapping a library, object, and symbol with default mapping. This should not emit additional rules,
         # other than the default ones.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -191,7 +197,7 @@ entries:
         #
         # This is a check needed to make sure generation does not generate
         # intermediate commands due to presence of symbol mapping.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -207,7 +213,7 @@ entries:
         #
         # This is a check needed to make sure generation does not generate
         # intermediate commands due to presence of symbol mapping.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -234,7 +240,7 @@ class BasicTest(GenerationTest):
         # iram0_text
         #   *(.iram ...)
         #   *libfreertos.a(.literal  ...)                                                                          B
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -264,14 +270,14 @@ entries:
         # There should be exclusions in the default commands for flash_text and flash_rodata:
         #
         # flash_text
-        #   *((EXCLUDE_FILE(libfreertos.a:croutine)) .literal ...)                                                          A
+        #   *((EXCLUDE_FILE(libfreertos.a:croutine)) .literal ...)                                          A
         #
         # Commands placing the entire library in iram, dram should be generated:
         #
         # iram0_text
         #   *(.iram ...)
-        #   *libfreertos.a:croutine(.literal  ...)                                                                          B
-        mapping = u"""
+        #   *libfreertos.a:croutine(.literal  ...)                                                          B
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -299,19 +305,20 @@ entries:
 
     def test_nondefault_mapping_symbol(self):
         # Test mapping entry different from default for symbol.
-        # There should be exclusions in the default commands for flash_text, as well as the implicit intermediate object command
+        # There should be exclusions in the default commands for flash_text, as
+        # well as the implicit intermediate object command
         # with an exclusion from default:
         #
         # flash_text
-        #   *((EXCLUDE_FILE(libfreertos.a:croutine)) .literal ...)                                                          A
-        #   *libfreertos.a:croutine(.literal  .literal.prvCheckDelayedList ...)                                             B
+        #   *((EXCLUDE_FILE(libfreertos.a:croutine)) .literal ...)                                          A
+        #   *libfreertos.a:croutine(.literal  .literal.prvCheckDelayedList ...)                             B
         #
         # Commands placing the entire library in iram should be generated:
         #
         # iram0_text
         #   *(.iram ...)
-        #   *libfreertos.a:croutine(.text.prvCheckPendingReadyList .literal.prvCheckPendingReadyList)                       C
-        mapping = u"""
+        #   *libfreertos.a:croutine(.text.prvCheckPendingReadyList .literal.prvCheckPendingReadyList)       C
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -340,7 +347,9 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Input section commands in iram_text for #1                                     C
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -422,14 +431,14 @@ entries:
         # object file, including .debug, .comment and other input section.
         #
         # flash.rodata
-        #   *((EXCLUDE_FILE(*libsoc.a:temperature_sensor_periph.*)) .rodata.* ...)                                          A
-        #   # *libsoc.a:temperature_sensor_periph.*                                                                         X
+        #   *((EXCLUDE_FILE(*libsoc.a:temperature_sensor_periph.*)) .rodata.* ...)                          A
+        #   # *libsoc.a:temperature_sensor_periph.*                                                         X
         #
         # Commands placing the entire library in iram should be generated:
         #
         # dram0_data
-        #   *libsoc.a:temperature_sensor_periph.*(.rodata.temperature_sensor_attribute)                                     B
-        mapping = u"""
+        #   *libsoc.a:temperature_sensor_periph.*(.rodata.temperature_sensor_attribute)                     B
+        mapping = """
 [mapping:test]
 archive: libsoc.a
 entries:
@@ -447,14 +456,15 @@ entries:
         flash_rodata[0].exclusions.add(TEMPERATURE_SENSOR_PERIPH)
 
         # Input section commands in dram0_data for #1                                    B
-        dram0_data.append(InputSectionDesc(TEMPERATURE_SENSOR_PERIPH,
-                                           set(['.rodata.temperature_sensor_attributes']),
-                                           []))
+        dram0_data.append(
+            InputSectionDesc(TEMPERATURE_SENSOR_PERIPH, set(['.rodata.temperature_sensor_attributes']), [])
+        )
 
         self.compare_rules(expected, actual)
 
     def test_default_symbol_nondefault_lib(self):
-        # Test default symbol mapping with different lib mapping. This should create an implicit intermediate object command.
+        # Test default symbol mapping with different lib mapping. This should
+        # create an implicit intermediate object command.
         # The significant targets are flash_text, flash_rodata, iram0_text, dram0_data.
         #
         # flash_text
@@ -474,7 +484,7 @@ entries:
         #  libfreertos.a ( .rodata ...)                                                                     C.2
         #
         # Only default commands are in the other targets.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -511,7 +521,9 @@ entries:
         iram0_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Command for #2                                                                                    B
-        flash_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        flash_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -536,7 +548,7 @@ entries:
         #   *libfreertos.a:croutine(.rodata ....)                                                                    C.2
         #
         # Only default commands are in the other targets
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -570,7 +582,9 @@ entries:
         dram0_data.append(InputSectionDesc(CROUTINE, flash_rodata[0].sections, []))
 
         # Command for #2                                                                                    B
-        flash_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        flash_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -603,7 +617,7 @@ entries:
         #  libfreertos.a (EXCLUDE_FILE(libfreertos:croutine) .rodata ...)                                    C
         #
         # For the other targets only the default commands should be present.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -646,14 +660,16 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Command for #3                                                                                    D
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
     def test_nondefault_but_same_lib_and_obj(self):
         # Extension of DefaultMappingTest. Commands should not be generated for #2, since it does similar mapping
         # to #1. Output is similar to test_different_mapping_lib.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -665,7 +681,7 @@ entries:
     def test_nondefault_but_same_lib_and_sym(self):
         # Extension of DefaultMappingTest. Commands should not be generated for #2, since it does similar mapping
         # to #1. Output is similar to test_different_mapping_lib.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -677,7 +693,7 @@ entries:
     def test_nondefault_but_same_obj_and_sym(self):
         # Commands should not be generated for #2, since it does similar mapping
         # to #1. Output is similar to test_different_mapping_obj.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -698,7 +714,7 @@ entries:
         # iram0_text
         #
         #
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -730,8 +746,12 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Commands for #1 & 2
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckDelayedList', '.literal.prvCheckDelayedList']), []))
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckDelayedList', '.literal.prvCheckDelayedList']), [])
+        )
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -742,7 +762,7 @@ entries:
         # iram0_text
         #   * (.custom_section)                                  A
         #   * (.iram .iram.*)
-        mapping = u"""
+        mapping = """
 [sections:custom_section]
 entries:
     .custom_section
@@ -771,7 +791,6 @@ entries:
 
 
 class AdvancedTest(GenerationTest):
-
     # Test valid but quirky cases, corner cases, failure cases, and
     # cases involving interaction between schemes, other mapping
     # fragments.
@@ -798,7 +817,7 @@ class AdvancedTest(GenerationTest):
         #   *(.data ..)
         #   *(.dram ...)
         #   *libfreertos.a:croutine(.rodata .rodata.*)                                                               D
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -852,7 +871,7 @@ entries:
         #   *(.data ..)
         #   *(.dram ...)
         #   *libfreertos.a:croutine(.rodata .rodata.*)                                                               D
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -889,7 +908,7 @@ entries:
         # noflash = text -> iram0_text, rodata -> dram0_data
         #
         # This operation should fail.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -908,7 +927,7 @@ entries:
         # noflash = .text -> iram0_text, .rodata -> dram0_data
         #
         # This operation should fail.
-        mapping = u"""
+        mapping = """
 [sections:custom_text]
 entries:
     .text+
@@ -932,42 +951,42 @@ entries:
         # using another. Another object and symbol is mapped the other way around.
         #
         # flash_text
-        #   *(EXCLUDE_FILE(libfreertos.a:croutine libfreertos.a:timers) .text ...)                                                        A, B
+        #   *(EXCLUDE_FILE(libfreertos.a:croutine libfreertos.a:timers) .text ...)                          A, B
         #
         # flash_rodata
-        #   *(EXCLUDE_FILE(libfreertos.a:croutine libfreertos.a:timers) .rodata ...)                                                      A, B
+        #   *(EXCLUDE_FILE(libfreertos.a:croutine libfreertos.a:timers) .rodata ...)                        A, B
         #
         # dram0_data
-        #   *(EXCLUDE_FILES(libfreertos.a:timers) .data ..)                                                                               B
+        #   *(EXCLUDE_FILES(libfreertos.a:timers) .data ..)                                                 B
         #   *(.dram ...)
-        #   *libfreertos.a:croutine(.rodata .rodata.*)                                                                                    C
-        #   *libfreertos.a:timers(.rodata.prvProcessReceivedCommands ...)                                                                 E
+        #   *libfreertos.a:croutine(.rodata .rodata.*)                                                      C
+        #   *libfreertos.a:timers(.rodata.prvProcessReceivedCommands ...)                                   E
         #
         # dram0_bss
-        #   *(EXCLUDE_FILE(libfreertos.a:timers) .bss .bss.* ...)                                                                         B
-        #   *(EXCLUDE_FILE(libfreertos.a:timers) COMMON)                                                                                  B
+        #   *(EXCLUDE_FILE(libfreertos.a:timers) .bss .bss.* ...)                                           B
+        #   *(EXCLUDE_FILE(libfreertos.a:timers) COMMON)                                                    B
         #
         # iram0_text
         #   *(.iram ...)
-        #   *libfreertos.a:croutine(.literal  .literal.prvCheckDelayedList ...)                                                           C
-        #   *libfreertos.a:timers(.literal  .literal.prvProcessReceivedCommands ...)                                                      E
+        #   *libfreertos.a:croutine(.literal  .literal.prvCheckDelayedList ...)                             C
+        #   *libfreertos.a:timers(.literal  .literal.prvProcessReceivedCommands ...)                        E
         #
         # rtc_text
         #   *(rtc.text .rtc.literal)
-        #   libfreertos.a:croutine (.text.prvCheckPendingReadyList .literal.prvCheckPendingReadyList)                                     F
-        #   libfreertos.a:timers (.text .text.prvCheckForValidListAndQueue ...)                                                           D.2
+        #   libfreertos.a:croutine (.text.prvCheckPendingReadyList .literal.prvCheckPendingReadyList)       F
+        #   libfreertos.a:timers (.text .text.prvCheckForValidListAndQueue ...)                             D.2
         #
         # rtc_data
         #   *(rtc.data)
         #   *(rtc.rodata)
-        #   libfreertos.a:timers (.data .data.*)                                                                                          D
-        #   libfreertos.a:timers (.rodata ...)                                                                                            D.2
+        #   libfreertos.a:timers (.data .data.*)                                                            D
+        #   libfreertos.a:timers (.rodata ...)                                                              D.2
         #
         # rtc_bss
         #   *(rtc.bss .rtc.bss)
-        #   libfreertos.a:timers (.bss .bss.*)                                                                                            D
-        #   libfreertos.a:timers (COMMON)                                                                                                 D
-        mapping = u"""
+        #   libfreertos.a:timers (.bss .bss.*)                                                              D
+        #   libfreertos.a:timers (COMMON)                                                                   D
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1015,7 +1034,9 @@ entries:
 
         # Commands for #4                                                                   F
         # Processed first due to alphabetical ordering
-        rtc_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        rtc_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         # Commands for #2                                                                   D
         # List all relevant sections excluding #3 for text -> rtc_text and                  D.2
@@ -1037,7 +1058,11 @@ entries:
         rtc_bss.append(InputSectionDesc(TIMERS, dram0_bss[1].sections, []))
 
         # Commands for #3                                                                  E
-        iram0_text.append(InputSectionDesc(TIMERS, set(['.text.prvProcessReceivedCommands', '.literal.prvProcessReceivedCommands']), []))
+        iram0_text.append(
+            InputSectionDesc(
+                TIMERS, set(['.text.prvProcessReceivedCommands', '.literal.prvProcessReceivedCommands']), []
+            )
+        )
         dram0_data.append(InputSectionDesc(TIMERS, set(['.rodata.prvProcessReceivedCommands']), []))
 
         self.compare_rules(expected, actual)
@@ -1054,7 +1079,7 @@ entries:
         #   * (EXCLUDE_FILE(libfreertos.a libfreertos.a:croutine) .text ...)
         #
         # iram0_text
-        mapping = u"""
+        mapping = """
 [mapping:test_1]
 archive: libfreertos.a
 entries:
@@ -1099,7 +1124,7 @@ entries:
         #
         # Uses the same entries as C_05 but spreads them across
         # two fragments. The output should still be the same.
-        mapping = u"""
+        mapping = """
 [mapping:test_1]
 archive: libfreertos.a
 entries:
@@ -1117,7 +1142,7 @@ entries:
     def test_mapping_same_lib_in_multiple_fragments_conflict(self):
         # Test mapping fragments operating on the same archive
         # with conflicting mappings.
-        mapping = u"""
+        mapping = """
 [mapping:test_1]
 archive: libfreertos.a
 entries:
@@ -1149,7 +1174,7 @@ entries:
         #   libfreertos:croutine(.text.prvCheckPendingReadyList .literal.prvCheckPendingReadyList)              G
         #   libfreertos2:croutine(.text .literal ...)                                                           D
         #   libfreertos2:croutine2(.text .literal ...)                                                          E
-        mapping = u"""
+        mapping = """
 [mapping:freertos2]
 archive: libfreertos2.a
 entries:
@@ -1187,8 +1212,12 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Command for
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckDelayedList', '.literal.prvCheckDelayedList']), []))
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckDelayedList', '.literal.prvCheckDelayedList']), [])
+        )
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         iram0_text.append(InputSectionDesc(Entity(FREERTOS2.archive, 'croutine'), flash_text[0].sections, []))
         iram0_text.append(InputSectionDesc(Entity(FREERTOS2.archive, 'croutine2'), flash_text[0].sections, []))
@@ -1197,7 +1226,7 @@ entries:
 
     def test_ambigious_obj(self):
         # Command generation for ambiguous entry should fail.
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1214,7 +1243,7 @@ entries:
         #
         # 'custom_scheme' entries conflict the 'default' scheme
         # entries.
-        mapping = u"""
+        mapping = """
 [scheme:custom_scheme]
 entries:
     flash_text -> iram0_text
@@ -1234,7 +1263,7 @@ entries:
         #
         # custom_scheme has the 'iram -> iram0_text' in common with
         # default scheme
-        mapping = u"""
+        mapping = """
 [sections:custom_section]
 entries:
     .custom_section
@@ -1269,7 +1298,7 @@ class ConfigTest(GenerationTest):
     def _test_conditional_on_scheme(self, perf, alt=None):
         # Test that proper commands are generated if using
         # schemes with conditional entries.
-        scheme = u"""
+        scheme = """
 [sections:cond_text_data]
 entries:
     if PERFORMANCE_LEVEL >= 1:
@@ -1286,7 +1315,7 @@ entries:
         cond_text_data -> dram0_data
 """
 
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: lib.a
 entries:
@@ -1321,7 +1350,7 @@ entries:
     def test_conditional_mapping(self, alt=None):
         # Test that proper commands are generated
         # in conditional mapping entries.
-        mapping = u"""
+        mapping = """
 [mapping:default]
 archive: *
 entries:
@@ -1370,7 +1399,7 @@ entries:
     def test_multiple_fragment_same_lib_conditional(self):
         # Test conditional entries on new mapping fragment grammar.
         # across multiple fragments.
-        mapping = u"""
+        mapping = """
 [mapping:default]
 archive: *
 entries:
@@ -1402,7 +1431,6 @@ entries:
 
 
 class FlagTest(GenerationTest):
-
     # Test correct generation of mapping fragment entries
     # with flags.
 
@@ -1433,7 +1461,7 @@ class FlagTest(GenerationTest):
         #   libfreertos.a:croutine(.text .literal ...)                                  I
         #   . = ALIGN(4)                                                                G.2
         #   _sym1_end                                                                   H.2
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1493,7 +1521,7 @@ entries:
         # iram0_text
         #   *(.iram .iram.*)
         #   libfreertos.a:croutine(.text.prvCheckPendingReadyList ...)                  D
-        mapping = u"""
+        mapping = """
 [mapping:default]
 archive: *
 entries:
@@ -1537,7 +1565,9 @@ entries:
         flash_text.append(SymbolAtAddress('_sym1_end'))
 
         # Command for #3                                               D
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -1555,7 +1585,7 @@ entries:
         # iram0_text
         #   *(.iram .iram.*)
         #   libfreertos.a:croutine(.text.prvCheckPendingReadyList ...)                  D
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1594,7 +1624,9 @@ entries:
         flash_text.append(SymbolAtAddress('_sym1_end'))
 
         # Command for #3                                               C
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -1611,7 +1643,7 @@ entries:
         # iram0_text
         #   *(.iram .iram.*)
         #   libfreertos.a:croutine(.text.prvCheckPendingReadyList ...)                  C
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1646,7 +1678,9 @@ entries:
         flash_text.append(SymbolAtAddress('_sym1_end'))
 
         # Command for #3                                               C
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -1662,7 +1696,7 @@ entries:
         # iram0_text
         #   *(.iram .iram.*)
         #   libfreertos.a:croutine(.text.prvCheckPendingReadyList ...)                  D
-        mapping = u"""
+        mapping = """
 [mapping:default]
 archive: *
 entries:
@@ -1707,7 +1741,9 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Command for #4                                               D
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
@@ -1724,7 +1760,7 @@ entries:
         # iram0_text
         #   *(.iram .iram.*)
         #   libfreertos.a:croutine(.text.prvCheckPendingReadyList ...)                  D
-        mapping = u"""
+        mapping = """
 [mapping:test]
 archive: libfreertos.a
 entries:
@@ -1764,14 +1800,16 @@ entries:
         flash_text.append(InputSectionDesc(CROUTINE, set(filtered_sections), []))
 
         # Command for #3                                               C
-        iram0_text.append(InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), []))
+        iram0_text.append(
+            InputSectionDesc(CROUTINE, set(['.text.prvCheckPendingReadyList', '.literal.prvCheckPendingReadyList']), [])
+        )
 
         self.compare_rules(expected, actual)
 
     def test_flag_additions(self):
         # Test ability to add flags as long as no other mapping fragments
         # does the same thing.
-        mapping = u"""
+        mapping = """
 [mapping:default_add_flag]
 archive: *
 entries:
@@ -1792,7 +1830,7 @@ entries:
     def test_flags_flag_additions_duplicate(self):
         # Test same flags added to same entity - these
         # are ignored.
-        mapping = u"""
+        mapping = """
 [mapping:default_add_flag_1]
 archive: *
 entries:
@@ -1819,7 +1857,7 @@ entries:
     def test_flags_flag_additions_conflict(self):
         # Test condition where multiple fragments specifies flags
         # to same entity - should generate exception.
-        mapping = u"""
+        mapping = """
 [mapping:default_add_flag_1]
 archive: *
 entries: