7 files changed, 23 insertions, 17 deletions
diff --git a/builddefs/build_full_test.mk b/builddefs/build_full_test.mk
index 35f0a05b99..964ba773d4 100644
--- a/builddefs/build_full_test.mk
+++ b/builddefs/build_full_test.mk
@@ -24,6 +24,8 @@ $(TEST)_SRC := \
 	tests/test_common/matrix.c \
 	tests/test_common/test_driver.cpp \
 	tests/test_common/keyboard_report_util.cpp \
+	tests/test_common/keycode_util.cpp \
+	tests/test_common/keycode_table.cpp \
 	tests/test_common/test_fixture.cpp \
 	tests/test_common/test_keymap_key.cpp \
 	tests/test_common/test_logger.cpp \
diff --git a/builddefs/build_test.mk b/builddefs/build_test.mk
index 7c8fdd20e5..4230598373 100644
--- a/builddefs/build_test.mk
+++ b/builddefs/build_test.mk
@@ -62,6 +62,7 @@ include $(PLATFORM_PATH)/common.mk
 include $(TMK_PATH)/protocol.mk
 include $(QUANTUM_PATH)/debounce/tests/rules.mk
 include $(QUANTUM_PATH)/encoder/tests/rules.mk
+include $(QUANTUM_PATH)/os_detection/tests/rules.mk
 include $(QUANTUM_PATH)/sequencer/tests/rules.mk
 include $(QUANTUM_PATH)/wear_leveling/tests/rules.mk
 include $(QUANTUM_PATH)/logging/print.mk
diff --git a/builddefs/common_features.mk b/builddefs/common_features.mk
index d9130b5338..dbcfcb7145 100644
--- a/builddefs/common_features.mk
+++ b/builddefs/common_features.mk
@@ -907,3 +907,11 @@ ifeq ($(strip $(ENCODER_ENABLE)), yes)
         OPT_DEFS += -DENCODER_MAP_ENABLE
     endif
 endif
+
+ifeq ($(strip $(OS_DETECTION_ENABLE)), yes)
+    SRC += $(QUANTUM_DIR)/os_detection.c
+    OPT_DEFS += -DOS_DETECTION_ENABLE
+    ifeq ($(strip $(OS_DETECTION_DEBUG_ENABLE)), yes)
+        OPT_DEFS += -DOS_DETECTION_DEBUG_ENABLE
+    endif
+endif
diff --git a/builddefs/converters.mk b/builddefs/converters.mk
index c7e499226c..4593c7113f 100644
--- a/builddefs/converters.mk
+++ b/builddefs/converters.mk
@@ -1,19 +1,8 @@
 # Note for new boards -- CTPC and CONVERT_TO_PROTON_C are deprecated terms
 # and should not be replicated for new boards. These will be removed from
 # documentation as well as existing keymaps in due course.
-ifeq ($(strip $(CTPC)), yes)
-    CONVERT_TO_PROTON_C=yes
-endif
-ifeq ($(strip $(CONVERT_TO_PROTON_C)), yes)
-    CONVERT_TO=proton_c
-
-cpfirmware: ctpc_warning
-.INTERMEDIATE: ctpc_warning
-ctpc_warning: elf
-	$(info @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@)
-	$(info The `CONVERT_TO_PROTON_C` and `CTPC` options are soon to be deprecated.)
-	$(info Boards should be changed to use `CONVERT_TO=proton_c` instead.)
-	$(info @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@)
+ifneq ($(findstring yes, $(CTPC)$(CONVERT_TO_PROTON_C)),)
+$(call CATASTROPHIC_ERROR,The `CONVERT_TO_PROTON_C` and `CTPC` options are now deprecated. `CONVERT_TO=proton_c` should be used instead.)
 endif
 
 # TODO: opt in rather than assume everything uses a pro micro
diff --git a/builddefs/mcu_selection.mk b/builddefs/mcu_selection.mk
index 382d9571a4..b566b1b5ac 100644
--- a/builddefs/mcu_selection.mk
+++ b/builddefs/mcu_selection.mk
@@ -275,7 +275,11 @@ ifneq ($(findstring STM32F103, $(MCU)),)
   # Linker script to use
   # - it should exist either in <chibios>/os/common/startup/ARMCMx/compilers/GCC/ld/
   #   or <keyboard_dir>/ld/
-  MCU_LDSCRIPT ?= STM32F103x8
+  ifeq ($(strip $(BOOTLOADER)), uf2boot)
+    MCU_LDSCRIPT ?= STM32F103xB_uf2boot
+  else
+    MCU_LDSCRIPT ?= STM32F103x8
+  endif
 
   # Startup code to use
   #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
diff --git a/builddefs/message.mk b/builddefs/message.mk
index 07d0e07ce8..bf39554dab 100644
--- a/builddefs/message.mk
+++ b/builddefs/message.mk
@@ -64,9 +64,10 @@ MSG_ASSEMBLING = Assembling:
 MSG_CLEANING = Cleaning project:
 MSG_CREATING_LIBRARY = Creating library:
 MSG_GENERATING = Generating:
+MSG_NOT_REPO = $(WARN_COLOR)WARNING:$(NO_COLOR) Target folder is not a git repo, you probably downloaded a zip file instead of cloning.\n\
+Please consider following $(BOLD)https://docs.qmk.fm/\#/newbs_getting_started$(NO_COLOR).\n\n
 MSG_SUBMODULE_DIRTY = $(WARN_COLOR)WARNING:$(NO_COLOR) Some git submodules are out of date or modified.\n\
-Please consider running $(BOLD)make git-submodule$(NO_COLOR).\n\n
-MSG_NO_CMP = $(ERROR_COLOR)Error:$(NO_COLOR)$(BOLD) cmp command not found, please install diffutils\n$(NO_COLOR)
+Please consider running $(BOLD)qmk git-submodule$(NO_COLOR).\n\n
 
 define GENERATE_MSG_MAKE_KB
     MSG_MAKE_KB_ACTUAL := Making $$(KB_SP) with keymap $(BOLD)$$(CURRENT_KM)$(NO_COLOR)
@@ -106,4 +107,4 @@ MSG_BOOTLOADER_NOT_FOUND_QUICK_RETRY = $(MSG_BOOTLOADER_NOT_FOUND_BASE) Trying a
 define CATASTROPHIC_ERROR
     $(shell printf "\n * %-99s $(ERROR_STRING)\n" "$2" >&2)
     $(error $1)
-endef
-\ No newline at end of file
+endef
diff --git a/builddefs/testlist.mk b/builddefs/testlist.mk
index 8a30a44972..74a794adcd 100644
--- a/builddefs/testlist.mk
+++ b/builddefs/testlist.mk
@@ -3,6 +3,7 @@ FULL_TESTS := $(notdir $(TEST_LIST))
 
 include $(QUANTUM_PATH)/debounce/tests/testlist.mk
 include $(QUANTUM_PATH)/encoder/tests/testlist.mk
+include $(QUANTUM_PATH)/os_detection/tests/testlist.mk
 include $(QUANTUM_PATH)/sequencer/tests/testlist.mk
 include $(QUANTUM_PATH)/wear_leveling/tests/testlist.mk
 include $(PLATFORM_PATH)/test/testlist.mk