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diff --git a/builddefs/bootloader.mk b/builddefs/bootloader.mk
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+# Copyright 2017 Jack Humbert
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# If it's possible that multiple bootloaders can be used for one project,
+# you can leave this unset, and the correct size will be selected
+# automatically.
+#
+# Sets the bootloader defined in the keyboard's/keymap's rules.mk
+# Current options:
+#
+# AVR:
+# halfkay PJRC Teensy
+# caterina Pro Micro (Sparkfun/generic)
+# atmel-dfu Atmel factory DFU
+# lufa-dfu LUFA DFU
+# qmk-dfu QMK DFU (LUFA + blinkenlight)
+# qmk-hid QMK HID (LUFA + blinkenlight)
+# bootloadhid HIDBootFlash compatible (ATmega32A)
+# usbasploader USBaspLoader (ATmega328P)
+# ARM:
+# kiibohd Input:Club Kiibohd bootloader (only used on their boards)
+# stm32duino STM32Duino (STM32F103x8)
+# stm32-dfu STM32 USB DFU in ROM
+# apm32-dfu APM32 USB DFU in ROM
+# RISC-V:
+# gd32v-dfu GD32V USB DFU in ROM
+#
+# BOOTLOADER_SIZE can still be defined manually, but it's recommended
+# you add any possible configuration to this list
+
+ifeq ($(strip $(BOOTLOADER)), atmel-dfu)
+ OPT_DEFS += -DBOOTLOADER_ATMEL_DFU
+ OPT_DEFS += -DBOOTLOADER_DFU
+ ifneq (,$(filter $(MCU), at90usb162 atmega16u2 atmega32u2 atmega16u4 atmega32u4 at90usb646 at90usb647))
+ BOOTLOADER_SIZE = 4096
+ endif
+ ifneq (,$(filter $(MCU), at90usb1286 at90usb1287))
+ BOOTLOADER_SIZE = 8192
+ endif
+endif
+ifeq ($(strip $(BOOTLOADER)), lufa-dfu)
+ OPT_DEFS += -DBOOTLOADER_LUFA_DFU
+ OPT_DEFS += -DBOOTLOADER_DFU
+ ifneq (,$(filter $(MCU), at90usb162 atmega16u2 atmega32u2 atmega16u4 atmega32u4 at90usb646 at90usb647))
+ BOOTLOADER_SIZE ?= 4096
+ endif
+ ifneq (,$(filter $(MCU), at90usb1286 at90usb1287))
+ BOOTLOADER_SIZE ?= 8192
+ endif
+endif
+ifeq ($(strip $(BOOTLOADER)), qmk-dfu)
+ OPT_DEFS += -DBOOTLOADER_QMK_DFU
+ OPT_DEFS += -DBOOTLOADER_DFU
+ ifneq (,$(filter $(MCU), at90usb162 atmega16u2 atmega32u2 atmega16u4 atmega32u4 at90usb646 at90usb647))
+ BOOTLOADER_SIZE ?= 4096
+ endif
+ ifneq (,$(filter $(MCU), at90usb1286 at90usb1287))
+ BOOTLOADER_SIZE ?= 8192
+ endif
+endif
+ifeq ($(strip $(BOOTLOADER)), qmk-hid)
+ OPT_DEFS += -DBOOTLOADER_QMK_HID
+ OPT_DEFS += -DBOOTLOADER_HID
+ BOOTLOADER_SIZE ?= 4096
+endif
+ifeq ($(strip $(BOOTLOADER)), halfkay)
+ OPT_DEFS += -DBOOTLOADER_HALFKAY
+ ifeq ($(strip $(MCU)), atmega32u4)
+ BOOTLOADER_SIZE = 512
+ endif
+ ifeq ($(strip $(MCU)), at90usb1286)
+ BOOTLOADER_SIZE = 1024
+ endif
+endif
+ifeq ($(strip $(BOOTLOADER)), caterina)
+ OPT_DEFS += -DBOOTLOADER_CATERINA
+ BOOTLOADER_SIZE = 4096
+endif
+ifneq (,$(filter $(BOOTLOADER), bootloadhid bootloadHID))
+ OPT_DEFS += -DBOOTLOADER_BOOTLOADHID
+ BOOTLOADER_SIZE = 4096
+endif
+ifneq (,$(filter $(BOOTLOADER), usbasploader USBasp))
+ OPT_DEFS += -DBOOTLOADER_USBASP
+ BOOTLOADER_SIZE = 4096
+endif
+ifeq ($(strip $(BOOTLOADER)), lufa-ms)
+ OPT_DEFS += -DBOOTLOADER_MS
+ BOOTLOADER_SIZE ?= 8192
+ FIRMWARE_FORMAT = bin
+cpfirmware: lufa_warning
+.INTERMEDIATE: lufa_warning
+lufa_warning: $(FIRMWARE_FORMAT)
+ $(info @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@)
+ $(info LUFA MASS STORAGE Bootloader selected)
+ $(info DO NOT USE THIS BOOTLOADER IN NEW PROJECTS!)
+ $(info It is extremely prone to bricking, and is only included to support existing boards.)
+ $(info @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@)
+endif
+ifdef BOOTLOADER_SIZE
+ OPT_DEFS += -DBOOTLOADER_SIZE=$(strip $(BOOTLOADER_SIZE))
+endif
+
+ifeq ($(strip $(BOOTLOADER)), stm32-dfu)
+ OPT_DEFS += -DBOOTLOADER_STM32_DFU
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
+ DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+endif
+ifeq ($(strip $(BOOTLOADER)), apm32-dfu)
+ OPT_DEFS += -DBOOTLOADER_APM32_DFU
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS ?= -d 314B:0106 -a 0 -s 0x08000000:leave
+ DFU_SUFFIX_ARGS ?= -v 314B -p 0106
+endif
+ifeq ($(strip $(BOOTLOADER)), gd32v-dfu)
+ OPT_DEFS += -DBOOTLOADER_GD32V_DFU
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS ?= -d 28E9:0189 -a 0 -s 0x08000000:leave
+ DFU_SUFFIX_ARGS ?= -v 28E9 -p 0189
+endif
+ifeq ($(strip $(BOOTLOADER)), kiibohd)
+ OPT_DEFS += -DBOOTLOADER_KIIBOHD
+ ifeq ($(strip $(MCU_ORIG)), MK20DX128)
+ MCU_LDSCRIPT = MK20DX128BLDR4
+ endif
+ ifeq ($(strip $(MCU_ORIG)), MK20DX256)
+ MCU_LDSCRIPT = MK20DX256BLDR8
+ endif
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS = -d 1C11:B007
+ DFU_SUFFIX_ARGS = -v 1C11 -p B007
+endif
+ifeq ($(strip $(BOOTLOADER)), stm32duino)
+ OPT_DEFS += -DBOOTLOADER_STM32DUINO
+ MCU_LDSCRIPT = STM32F103x8_stm32duino_bootloader
+ BOARD = STM32_F103_STM32DUINO
+ # STM32F103 does NOT have an USB bootloader in ROM (only serial), so setting anything here does not make much sense
+ STM32_BOOTLOADER_ADDRESS = 0x80000000
+
+ # Options to pass to dfu-util when flashing
+ DFU_ARGS = -d 1EAF:0003 -a 2 -R
+ DFU_SUFFIX_ARGS = -v 1EAF -p 0003
+endif
+ifeq ($(strip $(BOOTLOADER)), tinyuf2)
+ OPT_DEFS += -DBOOTLOADER_TINYUF2
+endif