qmk_firmware/platforms/chibios/platform.mk

# Hey Emacs, this is a -*- makefile -*-
##############################################################################
# Architecture or project specific options
#

# Stack size to be allocated to the Cortex-M process stack. This stack is
# the stack used by the main() thread.
ifeq ($(USE_PROCESS_STACKSIZE),)
  USE_PROCESS_STACKSIZE = 0x800
endif

# Stack size to the allocated to the Cortex-M main/exceptions stack. This
# stack is used for processing interrupts and exceptions.
ifeq ($(USE_EXCEPTIONS_STACKSIZE),)
  USE_EXCEPTIONS_STACKSIZE = 0x400
endif

#
# Architecture or project specific options
##############################################################################

##############################################################################
# Project, sources and paths
#

# Imported source files and paths
OPT_OS = chibios
CHIBIOS = $(TOP_DIR)/lib/chibios
CHIBIOS_CONTRIB = $(TOP_DIR)/lib/chibios-contrib

#
# Startup, Port and Platform support selection
##############################################################################

ifeq ($(strip $(MCU)), risc-v)
    # RISC-V Support
    # As of 7.4.2021 there is only one supported RISC-V platform in Chibios-Contrib,
    # therefore all required settings are hard-coded
    USE_CHIBIOS_CONTRIB = yes
    STARTUP_MK = $(CHIBIOS_CONTRIB)/os/common/startup/RISCV-ECLIC/compilers/GCC/mk/startup_$(MCU_STARTUP).mk
    PORT_V = $(CHIBIOS_CONTRIB)/os/common/ports/RISCV-ECLIC/compilers/GCC/mk/port.mk
    RULESPATH = $(CHIBIOS_CONTRIB)/os/common/startup/RISCV-ECLIC/compilers/GCC
else
    # ARM Support
    CHIBIOS_PORT ?=
    ifeq ("$(CHIBIOS_PORT)","")
        CHIBIOS_PORT = ARMv$(ARMV)-M
    endif

    # Startup files. Try a few different locations, for compability with old versions and
    # for things hardware in the contrib repository
    STARTUP_MK = $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC/mk/startup_$(MCU_STARTUP).mk
    ifeq ("$(wildcard $(STARTUP_MK))","")
        STARTUP_MK = $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/mk/startup_$(MCU_STARTUP).mk
        ifeq ("$(wildcard $(STARTUP_MK))","")
            STARTUP_MK = $(CHIBIOS_CONTRIB)/os/common/startup/ARMCMx/compilers/GCC/mk/startup_$(MCU_STARTUP).mk
        endif
    endif

    # Port files. Try a few different locations, for compability with old versions and
    # for things hardware in the contrib repository
    PORT_V = $(CHIBIOS)/os/common/ports/$(CHIBIOS_PORT)/compilers/GCC/mk/port.mk
    ifeq ("$(wildcard $(PORT_V))","")
        PORT_V = $(CHIBIOS)/os/rt/ports/ARMCMx/compilers/GCC/mk/port_v$(ARMV)m.mk
        ifeq ("$(wildcard $(PORT_V))","")
            PORT_V = $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC/mk/port_v$(ARMV)m.mk
        endif
    endif

    # Rules location. Try a few different locations, for compability with old versions and
    # for things hardware in the contrib repository
    RULESPATH = $(CHIBIOS)/os/common/ports/$(CHIBIOS_PORT)/compilers/GCC
    ifeq ("$(wildcard $(RULESPATH)/rules.mk)","")
        RULESPATH = $(CHIBIOS)/os/common/ports/ARMCMx/compilers/GCC
        ifeq ("$(wildcard $(RULESPATH)/rules.mk)","")
            RULESPATH = $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC
        endif
    endif
endif

ifeq ("$(PLATFORM_NAME)","")
    PLATFORM_NAME = platform
endif

# If no MCU port name was specified, use the family instead
ifeq ("$(MCU_PORT_NAME)","")
    MCU_PORT_NAME = $(MCU_FAMILY)
endif

ifeq ("$(wildcard $(PLATFORM_MK))","")
    PLATFORM_MK = $(CHIBIOS_CONTRIB)/os/hal/ports/$(MCU_PORT_NAME)/$(MCU_SERIES)/$(PLATFORM_NAME).mk
    ifeq ("$(wildcard $(PLATFORM_MK))","")
        PLATFORM_MK = $(CHIBIOS)/os/hal/ports/$(MCU_PORT_NAME)/$(MCU_SERIES)/$(PLATFORM_NAME).mk
    endif
endif

# If no MCU architecture specified, use the MCU instead (allows for mcu_selection.mk to swap to cortex-m0 etc.)
ifeq ("$(MCU_ARCH)","")
    MCU_ARCH = $(MCU)
endif

include $(STARTUP_MK)
include $(PORT_V)
include $(PLATFORM_MK)

#
# Board support selection.
##############################################################################

BOARD_MK :=

ifneq ("$(wildcard $(KEYBOARD_PATH_5)/boards/$(BOARD)/board.mk)","")
    BOARD_PATH = $(KEYBOARD_PATH_5)
    BOARD_MK += $(KEYBOARD_PATH_5)/boards/$(BOARD)/board.mk
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/boards/$(BOARD)/board.mk)","")
    BOARD_PATH = $(KEYBOARD_PATH_4)
    BOARD_MK += $(KEYBOARD_PATH_4)/boards/$(BOARD)/board.mk
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/boards/$(BOARD)/board.mk)","")
    BOARD_PATH = $(KEYBOARD_PATH_3)
    BOARD_MK += $(KEYBOARD_PATH_3)/boards/$(BOARD)/board.mk
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/boards/$(BOARD)/board.mk)","")
    BOARD_PATH = $(KEYBOARD_PATH_2)
    BOARD_MK += $(KEYBOARD_PATH_2)/boards/$(BOARD)/board.mk
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/boards/$(BOARD)/board.mk)","")
    BOARD_PATH = $(KEYBOARD_PATH_1)
    BOARD_MK += $(KEYBOARD_PATH_1)/boards/$(BOARD)/board.mk
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/board/board.mk)","")
    BOARD_PATH = $(TOP_DIR)/platforms/chibios/boards/$(BOARD)
    BOARD_MK += $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/board/board.mk
    KEYBOARD_PATHS += $(BOARD_PATH)/configs
    ifneq ("$(wildcard $(BOARD_PATH)/rules.mk)","")
        include $(BOARD_PATH)/rules.mk
    endif
endif

ifeq ("$(wildcard $(BOARD_MK))","")
    BOARD_MK = $(CHIBIOS)/os/hal/boards/$(BOARD)/board.mk
    ifeq ("$(wildcard $(BOARD_MK))","")
        BOARD_MK = $(CHIBIOS_CONTRIB)/os/hal/boards/$(BOARD)/board.mk
    endif
endif

include $(BOARD_MK)

#
# Bootloader selection.
##############################################################################

# Set bootloader address if supplied.
ifdef STM32_BOOTLOADER_ADDRESS
    OPT_DEFS += -DSTM32_BOOTLOADER_ADDRESS=$(STM32_BOOTLOADER_ADDRESS)
endif

ifdef WB32_BOOTLOADER_ADDRESS
    OPT_DEFS += -DWB32_BOOTLOADER_ADDRESS=$(WB32_BOOTLOADER_ADDRESS)
endif

# Work out if we need to set up the include for the bootloader definitions
ifneq ("$(wildcard $(KEYBOARD_PATH_5)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_5)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_5)/boards/$(BOARD)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_5)/boards/$(BOARD)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_4)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/boards/$(BOARD)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_4)/boards/$(BOARD)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_3)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/boards/$(BOARD)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_3)/boards/$(BOARD)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_2)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/boards/$(BOARD)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_2)/boards/$(BOARD)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_1)/bootloader_defs.h
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/boards/$(BOARD)/bootloader_defs.h)","")
    OPT_DEFS += -include $(KEYBOARD_PATH_1)/boards/$(BOARD)/bootloader_defs.h
else ifneq ("$(wildcard $(BOARD_PATH)/configs/bootloader_defs.h)","")
    OPT_DEFS += -include $(BOARD_PATH)/configs/bootloader_defs.h
endif

#
# ChibiOS config selection.
##############################################################################

# Work out the config file directories
ifneq ("$(wildcard $(KEYBOARD_PATH_5)/chconf.h)","")
    CHCONFDIR = $(KEYBOARD_PATH_5)
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/chconf.h)","")
    CHCONFDIR = $(KEYBOARD_PATH_4)
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/chconf.h)","")
    CHCONFDIR = $(KEYBOARD_PATH_3)
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/chconf.h)","")
    CHCONFDIR = $(KEYBOARD_PATH_2)
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/chconf.h)","")
    CHCONFDIR = $(KEYBOARD_PATH_1)
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs/chconf.h)","")
    CHCONFDIR = $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs
else ifneq ("$(wildcard $(TOP_DIR)/platforms/boards/chibios/common/configs/chconf.h)","")
    CHCONFDIR = $(TOP_DIR)/platforms/chibios/boards/common/configs
endif

#
# HAL config selection.
##############################################################################

ifneq ("$(wildcard $(KEYBOARD_PATH_5)/halconf.h)","")
    HALCONFDIR = $(KEYBOARD_PATH_5)
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/halconf.h)","")
    HALCONFDIR = $(KEYBOARD_PATH_4)
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/halconf.h)","")
    HALCONFDIR = $(KEYBOARD_PATH_3)
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/halconf.h)","")
    HALCONFDIR = $(KEYBOARD_PATH_2)
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/halconf.h)","")
    HALCONFDIR = $(KEYBOARD_PATH_1)
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs/halconf.h)","")
    HALCONFDIR = $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/common/configs/halconf.h)","")
    HALCONFDIR = $(TOP_DIR)/platforms/chibios/boards/common/configs
endif

#
# Linker script selection.
##############################################################################

ifneq ("$(wildcard $(KEYBOARD_PATH_5)/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(KEYBOARD_PATH_5)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(KEYBOARD_PATH_4)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(KEYBOARD_PATH_3)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(KEYBOARD_PATH_2)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(KEYBOARD_PATH_1)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld/$(MCU_LDSCRIPT)_$(BOOTLOADER).ld)","")
    LDFLAGS += -L$(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld
    LDSCRIPT = $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld/$(MCU_LDSCRIPT)_$(BOOTLOADER).ld
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/common/ld/$(MCU_LDSCRIPT)_$(BOOTLOADER).ld)","")
    LDSCRIPT = $(TOP_DIR)/platforms/chibios/boards/common/ld/$(MCU_LDSCRIPT)_$(BOOTLOADER).ld
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld/$(MCU_LDSCRIPT).ld)","")
    LDFLAGS += -L$(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld
    LDSCRIPT = $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/common/ld/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(TOP_DIR)/platforms/chibios/boards/common/ld/$(MCU_LDSCRIPT).ld
else ifneq ("$(wildcard $(STARTUPLD_CONTRIB)/$(MCU_LDSCRIPT).ld)","")
    LDSCRIPT = $(STARTUPLD_CONTRIB)/$(MCU_LDSCRIPT).ld
    USE_CHIBIOS_CONTRIB = yes
else
    LDSCRIPT = $(STARTUPLD)/$(MCU_LDSCRIPT).ld
endif

#
# Include ChibiOS makefiles.
##############################################################################

# HAL-OSAL files (optional).
include $(CHIBIOS)/os/hal/hal.mk
include $(CHIBIOS)/os/oslib/oslib.mk
include $(CHIBIOS)/os/hal/osal/rt-nil/osal.mk
# RTOS files (optional).
include $(CHIBIOS)/os/rt/rt.mk
# Other files (optional).
include $(CHIBIOS)/os/hal/lib/streams/streams.mk

PLATFORM_SRC = \
        $(STARTUPSRC) \
        $(KERNSRC) \
        $(PORTSRC) \
        $(OSALSRC) \
        $(OSLIBSRC) \
        $(HALSRC) \
        $(PLATFORMSRC) \
        $(BOARDSRC) \
        $(STREAMSSRC) \
        $(CHIBIOS)/os/various/syscalls.c \
        $(PLATFORM_COMMON_DIR)/syscall-fallbacks.c \
        $(PLATFORM_COMMON_DIR)/wait.c \
        $(PLATFORM_COMMON_DIR)/synchronization_util.c \
        $(PLATFORM_COMMON_DIR)/interrupt_handlers.c

# Ensure the ASM files are not subjected to LTO -- it'll strip out interrupt handlers otherwise.
QUANTUM_LIB_SRC += $(STARTUPASM) $(PORTASM) $(OSALASM) $(PLATFORMASM)

PLATFORM_SRC := $(patsubst $(TOP_DIR)/%,%,$(PLATFORM_SRC))

EXTRAINCDIRS += $(CHIBIOS)/os/license \
         $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs \
         $(TOP_DIR)/platforms/chibios/boards/common/configs \
         $(HALCONFDIR) $(CHCONFDIR) \
         $(STARTUPINC) $(KERNINC) $(PORTINC) $(OSALINC) $(OSLIBINC) \
         $(HALINC) $(PLATFORMINC) $(BOARDINC) $(TESTINC) \
         $(STREAMSINC) $(CHIBIOS)/os/various $(COMMON_VPATH)

#
# QMK specific MCU family support selection.
##############################################################################
ifneq ("$(wildcard $(PLATFORM_PATH)/$(PLATFORM_KEY)/vendors/$(MCU_FAMILY)/$(MCU_SERIES).mk)","")
    # Either by MCU series e.g. STM32/STM32F1xx.mk or...
    include $(PLATFORM_PATH)/$(PLATFORM_KEY)/vendors/$(MCU_FAMILY)/$(MCU_SERIES).mk
else ifneq ("$(wildcard $(PLATFORM_PATH)/$(PLATFORM_KEY)/vendors/$(MCU_FAMILY)/$(MCU_FAMILY).mk)","")
    # By MCU family e.g. STM32/STM32.mk
    include $(PLATFORM_PATH)/$(PLATFORM_KEY)/vendors/$(MCU_FAMILY)/$(MCU_FAMILY).mk
endif

#
# ChibiOS-Contrib
##############################################################################

# Work out if we're using ChibiOS-Contrib by checking if halconf_community.h exists
ifneq ("$(wildcard $(KEYBOARD_PATH_5)/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
else ifneq ("$(wildcard $(KEYBOARD_PATH_4)/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
else ifneq ("$(wildcard $(KEYBOARD_PATH_3)/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
else ifneq ("$(wildcard $(KEYBOARD_PATH_2)/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
else ifneq ("$(wildcard $(KEYBOARD_PATH_1)/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
else ifneq ("$(wildcard $(TOP_DIR)/platforms/chibios/boards/$(BOARD)/configs/halconf_community.h)","")
    USE_CHIBIOS_CONTRIB = yes
endif

ifeq ($(strip $(USE_CHIBIOS_CONTRIB)),yes)
    include $(CHIBIOS_CONTRIB)/os/hal/hal.mk
    PLATFORM_SRC += $(PLATFORMSRC_CONTRIB) $(HALSRC_CONTRIB)
    EXTRAINCDIRS += $(PLATFORMINC_CONTRIB) $(HALINC_CONTRIB) $(CHIBIOS_CONTRIB)/os/various
endif

#
# Project, sources and paths
##############################################################################

##############################################################################
# Injected configs
#
ifneq ("$(wildcard $(BOARD_PATH)/configs/config.h)","")
    CONFIG_H += $(BOARD_PATH)/configs/config.h
endif
ifneq ("$(wildcard $(BOARD_PATH)/configs/post_config.h)","")
    POST_CONFIG_H += $(BOARD_PATH)/configs/post_config.h
endif

##############################################################################
# Compiler and Linker configuration
#

# Use defined stack sizes of the main thread in linker scripts
SHARED_LDSYMBOLS = -Wl,--defsym=__process_stack_size__=$(USE_PROCESS_STACKSIZE),--defsym=__main_stack_size__=$(USE_EXCEPTIONS_STACKSIZE)

# Shared Compiler flags for all toolchains
SHARED_CFLAGS = -fomit-frame-pointer \
                -ffunction-sections \
                -fdata-sections \
                -fno-common \
                -fshort-wchar \
                -fno-builtin-printf

LDSCRIPT_PATH := $(shell dirname "$(LDSCRIPT)")

# Shared Linker flags for all toolchains
SHARED_LDFLAGS = -T $(LDSCRIPT) \
                 -L $(LDSCRIPT_PATH) \
                 -Wl,--gc-sections \
                 -nostartfiles

ifeq ($(strip $(MCU)), risc-v)
    # RISC-V toolchain specific configuration
    # Find suitable GCC compiler
    ifeq ($(strip $(TOOLCHAIN)),)
        ifneq ($(shell which riscv32-unknown-elf-gcc 2>/dev/null),)
            TOOLCHAIN = riscv32-unknown-elf-
        else
            ifneq ($(shell which riscv64-unknown-elf-gcc 2>/dev/null),)
                TOOLCHAIN = riscv64-unknown-elf-
            else
                $(call CATASTROPHIC_ERROR,Missing toolchain,No RISC-V toolchain found. Can't find riscv32-unknown-elf-gcc or riscv64-unknown-elf-gcc found in your systems PATH variable. Please install a valid toolchain and make it accessible!)
            endif
        endif
    endif

    # Default to compiling with picolibc for RISC-V targets if available, which
    # is available by default on distributions based on Debian 11+.
    ifeq ($(shell $(TOOLCHAIN)gcc --specs=picolibc.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
        # Toolchain specific Compiler flags Note that we still link with our own
        # linker script by providing it via the -T flag in SHARED_LDFLAGS.
        TOOLCHAIN_CFLAGS = --specs=picolibc.specs

        # picolibc internally uses __heap_start and __heap_end instead of the
        # defacto chibios linker script standard __heap_base__ and __heap_end__
        # therefore we introduce these symbols as an alias.
        TOOLCHAIN_LDSYMBOLS = -Wl,--defsym=__heap_start=__heap_base__,--defsym=__heap_end=__heap_end__

        # Tell QMK that we are compiling with picolibc.
        OPT_DEFS += -DUSE_PICOLIBC
    endif

    # MCU architecture flags
    MCUFLAGS = -march=$(MCU_ARCH) \
               -mabi=$(MCU_ABI) \
               -mcmodel=$(MCU_CMODEL) \
               -mstrict-align

    # Deal with different arch revisions and gcc renaming them
    ifneq ($(shell echo 'int main() { asm("csrc 0x300,8"); return 0; }' | $(TOOLCHAIN)gcc $(MCUFLAGS) $(TOOLCHAIN_CFLAGS) -x c -o /dev/null - 2>/dev/null >/dev/null; echo $$?),0)
        MCUFLAGS = -march=$(MCU_ARCH)_zicsr \
                   -mabi=$(MCU_ABI) \
                   -mcmodel=$(MCU_CMODEL) \
                   -mstrict-align
        ifneq ($(shell echo 'int main() { asm("csrc 0x300,8"); return 0; }' | $(TOOLCHAIN)gcc $(MCUFLAGS) $(TOOLCHAIN_CFLAGS) -x c -o /dev/null - 2>/dev/null >/dev/null; echo $$?),0)
            $(call CATASTROPHIC_ERROR,Incompatible toolchain,No compatible RISC-V toolchain found. Can't work out correct architecture.)
        endif
    endif
else
    # ARM toolchain specific configuration
    TOOLCHAIN ?= arm-none-eabi-

    # Toolchain specific Linker flags
    TOOLCHAIN_LDFLAGS = -Wl,--no-wchar-size-warning \
                        --specs=nano.specs

    # MCU architecture flags
    MCUFLAGS = -mcpu=$(MCU) \
               -mthumb -DTHUMB_PRESENT \
               -mno-thumb-interwork -DTHUMB_NO_INTERWORKING \
               -mno-unaligned-access

    # Some ARM cores like the M4 and M7 have floating point units which can be enabled
    USE_FPU ?= no

    ifneq ($(USE_FPU),no)
        OPT_DEFS += -DCORTEX_USE_FPU=TRUE

        # Default is single precision floats
        USE_FPU_OPT ?= -mfloat-abi=hard \
                       -mfpu=fpv4-sp-d16 \
                       -fsingle-precision-constant

        MCUFLAGS += $(USE_FPU_OPT)
    else
        OPT_DEFS += -DCORTEX_USE_FPU=FALSE
    endif
endif

# Extra config.h files for the platform
ifneq ("$(wildcard $(PLATFORM_COMMON_DIR)/vendors/$(MCU_FAMILY)/$(MCU_SERIES)/config.h)","")
    CONFIG_H += $(PLATFORM_COMMON_DIR)/vendors/$(MCU_FAMILY)/$(MCU_SERIES)/config.h
endif
ifneq ("$(wildcard $(PLATFORM_COMMON_DIR)/vendors/$(MCU_FAMILY)/config.h)","")
    CONFIG_H += $(PLATFORM_COMMON_DIR)/vendors/$(MCU_FAMILY)/config.h
endif
CONFIG_H += $(PLATFORM_COMMON_DIR)/config.h

# Assembler flags
ASFLAGS  += $(SHARED_ASFLAGS) $(TOOLCHAIN_ASFLAGS)

# C Compiler flags
CFLAGS   += $(SHARED_CFLAGS) $(TOOLCHAIN_CFLAGS)

# C++ Compiler flags
CXXFLAGS += $(CFLAGS) $(SHARED_CXXFLAGS) $(TOOLCHAIN_CXXFLAGS) -fno-rtti

# Linker flags
LDFLAGS  += $(SHARED_LDFLAGS) $(SHARED_LDSYMBOLS) $(TOOLCHAIN_LDFLAGS) $(TOOLCHAIN_LDSYMBOLS) $(MCUFLAGS)

# Tell QMK that we are hosting it on ChibiOS.
OPT_DEFS += -DPROTOCOL_CHIBIOS

# And what flavor of MCU
OPT_DEFS += -DMCU_$(MCU_FAMILY)

# ChibiOS supports synchronization primitives like a Mutex
OPT_DEFS += -DPLATFORM_SUPPORTS_SYNCHRONIZATION

# Workaround to stop ChibiOS from complaining about new GCC -- it's been fixed for 7/8/9 already
OPT_DEFS += -DPORT_IGNORE_GCC_VERSION_CHECK=1

# Construct GCC toolchain
CC      = $(CC_PREFIX) $(TOOLCHAIN)gcc
OBJCOPY = $(TOOLCHAIN)objcopy
OBJDUMP = $(TOOLCHAIN)objdump
SIZE    = $(TOOLCHAIN)size
AR      = $(TOOLCHAIN)ar
NM      = $(TOOLCHAIN)nm
HEX     = $(OBJCOPY) -O $(FORMAT)
EEP     =
BIN     = $(OBJCOPY) -O binary

# disable warning about RWX triggered by ChibiOS linker scripts
ifeq ("$(shell echo "int main(){}" | $(CC) -shared -Wl,--no-warn-rwx-segments -x c - -o /dev/null 2>&1)", "")
	SHARED_LDFLAGS += -Wl,--no-warn-rwx-segments
endif

##############################################################################
# Make targets
#

DEBUG = gdb

# List any extra directories to look for libraries here.
EXTRALIBDIRS = $(RULESPATH)/ld

bin: $(BUILD_DIR)/$(TARGET).bin sizeafter
	$(COPY) $(BUILD_DIR)/$(TARGET).bin $(TARGET).bin;