16 files changed, 187 insertions, 48 deletions
diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index eb934ffe6..b787e77ec 100644
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -301,7 +301,7 @@ ifneq ($(strip $(BOOTLOADER)), qmk-dfu)
 endif
        make -C lib/lufa/Bootloaders/DFU/ clean
        $(QMK_BIN) generate-dfu-header --quiet --keyboard $(KEYBOARD) --output lib/lufa/Bootloaders/DFU/Keyboard.h
-        $(eval MAX_SIZE=$(shell n=`$(CC) -E -mmcu=$(MCU) $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | sed -ne 's/\r//;/^#/n;/^AVR_SIZE:/,$${s/^AVR_SIZE: //;p;}'` && echo $$(($$n)) || echo 0))
+        $(eval MAX_SIZE=$(shell n=`$(CC) -E -mmcu=$(MCU) -D__ASSEMBLER__ $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | sed -ne 's/\r//;/^#/n;/^AVR_SIZE:/,$${s/^AVR_SIZE: //;p;}'` && echo $$(($$n)) || echo 0))
        $(eval PROGRAM_SIZE_KB=$(shell n=`expr $(MAX_SIZE) / 1024` && echo $$(($$n)) || echo 0))
        $(eval BOOT_SECTION_SIZE_KB=$(shell n=`expr  $(BOOTLOADER_SIZE) / 1024` && echo $$(($$n)) || echo 0))
        $(eval FLASH_SIZE_KB=$(shell n=`expr $(PROGRAM_SIZE_KB) + $(BOOT_SECTION_SIZE_KB)` && echo $$(($$n)) || echo 0))
diff --git a/tmk_core/chibios.mk b/tmk_core/chibios.mk
index 97299b7d3..7eda36046 100644
--- a/tmk_core/chibios.mk
+++ b/tmk_core/chibios.mk
@@ -390,8 +390,10 @@ ifndef TEENSY_LOADER_CLI
    endif
 endif
+TEENSY_LOADER_CLI_MCU ?= $(MCU_LDSCRIPT)
 define EXEC_TEENSY
-        $(TEENSY_LOADER_CLI) -mmcu=$(MCU_LDSCRIPT) -w -v $(BUILD_DIR)/$(TARGET).hex
+        $(TEENSY_LOADER_CLI) -mmcu=$(TEENSY_LOADER_CLI_MCU) -w -v $(BUILD_DIR)/$(TARGET).hex
 endef
 teensy: $(BUILD_DIR)/$(TARGET).hex cpfirmware sizeafter
@@ -408,6 +410,8 @@ else ifeq ($(strip $(BOOTLOADER)),kiibohd)
        $(call EXEC_DFU_UTIL)
 else ifeq ($(strip $(MCU_FAMILY)),KINETIS)
        $(call EXEC_TEENSY)
+else ifeq ($(strip $(MCU_FAMILY)),MIMXRT1062)
+        $(call EXEC_TEENSY)
 else ifeq ($(strip $(MCU_FAMILY)),STM32)
        $(call EXEC_DFU_UTIL)
 else
diff --git a/tmk_core/common/arm_atsam/_timer.h b/tmk_core/common/arm_atsam/_timer.h
new file mode 100644
index 000000000..77402b612
--- /dev/null
+++ b/tmk_core/common/arm_atsam/_timer.h
@@ -0,0 +1,19 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * 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/>.
+ */
+#pragma once
+// The platform is 32-bit, so prefer 32-bit timers to avoid overflow
+#define FAST_TIMER_T_SIZE 32
diff --git a/tmk_core/common/avr/_timer.h b/tmk_core/common/avr/_timer.h
new file mode 100644
index 000000000..b81e0f68b
--- /dev/null
+++ b/tmk_core/common/avr/_timer.h
@@ -0,0 +1,19 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * 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/>.
+ */
+#pragma once
+// The platform is 8-bit, so prefer 16-bit timers to reduce code size
+#define FAST_TIMER_T_SIZE 16
diff --git a/tmk_core/common/avr/gpio.h b/tmk_core/common/avr/gpio.h
index 231556c29..e9be68491 100644
--- a/tmk_core/common/avr/gpio.h
+++ b/tmk_core/common/avr/gpio.h
@@ -20,6 +20,8 @@
 typedef uint8_t pin_t;
+/* Operation of GPIO by pin. */
 #define setPinInput(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
 #define setPinInputHigh(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
 #define setPinInputLow(pin) _Static_assert(0, "AVR processors cannot implement an input as pull low")
@@ -32,3 +34,16 @@ typedef uint8_t pin_t;
 #define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
 #define togglePin(pin) (PORTx_ADDRESS(pin) ^= _BV((pin)&0xF))
+/* Operation of GPIO by port. */
+typedef uint8_t port_data_t;
+#define readPort(port) PINx_ADDRESS(port)
+#define setPortBitInput(port, bit) (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
+#define setPortBitInputHigh(port, bit) (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) |= _BV((bit)&0xF))
+#define setPortBitOutput(port, bit) (DDRx_ADDRESS(port) |= _BV((bit)&0xF))
+#define writePortBitLow(port, bit) (PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
+#define writePortBitHigh(port, bit) (PORTx_ADDRESS(port) |= _BV((bit)&0xF))
diff --git a/tmk_core/common/chibios/_timer.h b/tmk_core/common/chibios/_timer.h
new file mode 100644
index 000000000..77402b612
--- /dev/null
+++ b/tmk_core/common/chibios/_timer.h
@@ -0,0 +1,19 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * 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/>.
+ */
+#pragma once
+// The platform is 32-bit, so prefer 32-bit timers to avoid overflow
+#define FAST_TIMER_T_SIZE 32
diff --git a/tmk_core/common/chibios/bootloader.c b/tmk_core/common/chibios/bootloader.c
index 11f7abf43..76d52ea60 100644
--- a/tmk_core/common/chibios/bootloader.c
+++ b/tmk_core/common/chibios/bootloader.c
@@ -95,7 +95,7 @@ void enter_bootloader_mode_if_requested(void) {
    }
 }
-#elif defined(KL2x) || defined(K20x) || defined(MK66F18)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
+#elif defined(KL2x) || defined(K20x) || defined(MK66F18) || defined(MIMXRT1062)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
 /* Kinetis */
 #    if defined(BOOTLOADER_KIIBOHD)
diff --git a/tmk_core/common/chibios/gpio.h b/tmk_core/common/chibios/gpio.h
index 5d0e142ab..4d057f1ca 100644
--- a/tmk_core/common/chibios/gpio.h
+++ b/tmk_core/common/chibios/gpio.h
@@ -20,6 +20,8 @@
 typedef ioline_t pin_t;
+/* Operation of GPIO by pin. */
 #define setPinInput(pin) palSetLineMode(pin, PAL_MODE_INPUT)
 #define setPinInputHigh(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLUP)
 #define setPinInputLow(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN)
@@ -32,3 +34,17 @@ typedef ioline_t pin_t;
 #define readPin(pin) palReadLine(pin)
 #define togglePin(pin) palToggleLine(pin)
+/* Operation of GPIO by port. */
+typedef uint16_t port_data_t;
+#define readPort(pin) palReadPort(PAL_PORT(pin))
+#define setPortBitInput(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT)
+#define setPortBitInputHigh(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT_PULLUP)
+#define setPortBitInputLow(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT_PULLDOWN)
+#define setPortBitOutput(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_OUTPUT_PUSHPULL)
+#define writePortBitLow(pin, bit) palClearLine(PAL_LINE(PAL_PORT(pin), bit))
+#define writePortBitHigh(pin, bit) palSetLine(PAL_LINE(PAL_PORT(pin), bit))
diff --git a/tmk_core/common/host.c b/tmk_core/common/host.c
index e7d92cfac..a8b391e89 100644
--- a/tmk_core/common/host.c
+++ b/tmk_core/common/host.c
@@ -17,6 +17,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdint.h>
 //#include <avr/interrupt.h>
+#include "keyboard.h"
 #include "keycode.h"
 #include "host.h"
 #include "util.h"
@@ -35,15 +36,20 @@ void host_set_driver(host_driver_t *d) { driver = d; }
 host_driver_t *host_get_driver(void) { return driver; }
+#ifdef SPLIT_KEYBOARD
+uint8_t split_led_state = 0;
+void    set_split_host_keyboard_leds(uint8_t led_state) { split_led_state = led_state; }
+#endif
 uint8_t host_keyboard_leds(void) {
+#ifdef SPLIT_KEYBOARD
+    if (!is_keyboard_master()) return split_led_state;
+#endif
    if (!driver) return 0;
    return (*driver->keyboard_leds)();
 }
-led_t host_keyboard_led_state(void) {
+led_t host_keyboard_led_state(void) { return (led_t)host_keyboard_leds(); }
-    if (!driver) return (led_t){0};
-    return (led_t)((*driver->keyboard_leds)());
-}
 /* send report */
 void host_keyboard_send(report_keyboard_t *report) {
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c
index 3d6092e71..28fa97bc8 100644
--- a/tmk_core/common/keyboard.c
+++ b/tmk_core/common/keyboard.c
@@ -85,6 +85,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef OLED_DRIVER_ENABLE
 #    include "oled_driver.h"
 #endif
+#ifdef ST7565_ENABLE
+#    include "st7565.h"
+#endif
 #ifdef VELOCIKEY_ENABLE
 #    include "velocikey.h"
 #endif
@@ -100,6 +103,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef EEPROM_DRIVER
 #    include "eeprom_driver.h"
 #endif
+#if defined(CRC_ENABLE)
+#    include "crc.h"
+#endif
 static uint32_t last_input_modification_time = 0;
 uint32_t        last_input_activity_time(void) { return last_input_modification_time; }
@@ -297,6 +303,9 @@ void keyboard_init(void) {
    timer_init();
    sync_timer_init();
    matrix_init();
+#if defined(CRC_ENABLE)
+    crc_init();
+#endif
 #ifdef VIA_ENABLE
    via_init();
 #endif
@@ -306,6 +315,9 @@ void keyboard_init(void) {
 #ifdef OLED_DRIVER_ENABLE
    oled_init(OLED_ROTATION_0);
 #endif
+#ifdef ST7565_ENABLE
+    st7565_init(DISPLAY_ROTATION_0);
+#endif
 #ifdef PS2_MOUSE_ENABLE
    ps2_mouse_init();
 #endif
@@ -470,6 +482,18 @@ MATRIX_LOOP_END:
 #    endif
 #endif
+#ifdef ST7565_ENABLE
+    st7565_task();
+#    ifndef ST7565_DISABLE_TIMEOUT
+    // Wake up display if user is using those fabulous keys or spinning those encoders!
+#        ifdef ENCODER_ENABLE
+    if (matrix_changed || encoders_changed) st7565_on();
+#        else
+    if (matrix_changed) st7565_on();
+#        endif
+#    endif
+#endif
 #ifdef MOUSEKEY_ENABLE
    // mousekey repeat & acceleration
    mousekey_task();
diff --git a/tmk_core/common/timer.h b/tmk_core/common/timer.h
index 58f637dd9..928811a2b 100644
--- a/tmk_core/common/timer.h
+++ b/tmk_core/common/timer.h
@@ -1,5 +1,6 @@
 /*
 Copyright 2011 Jun Wako <wakojun@gmail.com>
+Copyright 2021 Simon Arlott
 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
@@ -17,13 +18,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
+#if __has_include_next("_timer.h")
+#    include_next "_timer.h" /* Include the platform's _timer.h */
+#endif
 #include <stdint.h>
 #include <stdbool.h>
-#if defined(__AVR__)
-#    include "avr/timer_avr.h"
-#endif
 #define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a) - (b))) : ((max == UINT16_MAX) ? ((uint16_t)((a) - (b))) : ((max == UINT32_MAX) ? ((uint32_t)((a) - (b))) : ((a) >= (b) ? (a) - (b) : (max) + 1 - (b) + (a)))))
 #define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
 #define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)
@@ -47,6 +48,21 @@ uint32_t timer_elapsed32(uint32_t last);
 #define timer_expired(current, future) ((uint16_t)(current - future) < UINT16_MAX / 2)
 #define timer_expired32(current, future) ((uint32_t)(current - future) < UINT32_MAX / 2)
+// Use an appropriate timer integer size based on architecture (16-bit will overflow sooner)
+#if FAST_TIMER_T_SIZE < 32
+#    define TIMER_DIFF_FAST(a, b) TIMER_DIFF_16(a, b)
+#    define timer_expired_fast(current, future) timer_expired(current, future)
+typedef uint16_t fast_timer_t;
+fast_timer_t inline timer_read_fast(void) { return timer_read(); }
+fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed(last); }
+#else
+#    define TIMER_DIFF_FAST(a, b) TIMER_DIFF_32(a, b)
+#    define timer_expired_fast(current, future) timer_expired32(current, future)
+typedef uint32_t fast_timer_t;
+fast_timer_t inline timer_read_fast(void) { return timer_read32(); }
+fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed32(last); }
+#endif
 #ifdef __cplusplus
 }
 #endif
diff --git a/tmk_core/protocol/chibios/usb_main.c b/tmk_core/protocol/chibios/usb_main.c
index d04302aca..407b8ea75 100644
--- a/tmk_core/protocol/chibios/usb_main.c
+++ b/tmk_core/protocol/chibios/usb_main.c
@@ -903,7 +903,8 @@ static void send_extra(uint8_t report_id, uint16_t data) {
        return;
    }
-    report_extra_t report = {.report_id = report_id, .usage = data};
+    static report_extra_t report;
+    report = (report_extra_t){.report_id = report_id, .usage = data};
    usbStartTransmitI(&USB_DRIVER, SHARED_IN_EPNUM, (uint8_t *)&report, sizeof(report_extra_t));
    osalSysUnlock();
@@ -1051,45 +1052,44 @@ void virtser_task(void) {
 #ifdef JOYSTICK_ENABLE
 void send_joystick_packet(joystick_t *joystick) {
-    joystick_report_t rep = {
+    static joystick_report_t rep;
+    rep = (joystick_report_t) {
 #    if JOYSTICK_AXES_COUNT > 0
        .axes =
-            {
+        { joystick->axes[0],
-                joystick->axes[0],
 #        if JOYSTICK_AXES_COUNT >= 2
-                joystick->axes[1],
+          joystick->axes[1],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 3
-                joystick->axes[2],
+          joystick->axes[2],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 4
-                joystick->axes[3],
+          joystick->axes[3],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 5
-                joystick->axes[4],
+          joystick->axes[4],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 6
-                joystick->axes[5],
+          joystick->axes[5],
 #        endif
-            },
+        },
 #    endif  // JOYSTICK_AXES_COUNT>0
 #    if JOYSTICK_BUTTON_COUNT > 0
-        .buttons =
+        .buttons = {
-            {
+            joystick->buttons[0],
-                joystick->buttons[0],
 #        if JOYSTICK_BUTTON_COUNT > 8
-                joystick->buttons[1],
+            joystick->buttons[1],
 #        endif
 #        if JOYSTICK_BUTTON_COUNT > 16
-                joystick->buttons[2],
+            joystick->buttons[2],
 #        endif
 #        if JOYSTICK_BUTTON_COUNT > 24
-                joystick->buttons[3],
+            joystick->buttons[3],
 #        endif
-            }
+        }
 #    endif  // JOYSTICK_BUTTON_COUNT>0
    };
diff --git a/tmk_core/protocol/lufa/lufa.c b/tmk_core/protocol/lufa/lufa.c
index 63619fdb3..4ac079e16 100644
--- a/tmk_core/protocol/lufa/lufa.c
+++ b/tmk_core/protocol/lufa/lufa.c
@@ -314,45 +314,44 @@ static void Console_Task(void) {
 void send_joystick_packet(joystick_t *joystick) {
    uint8_t timeout = 255;
-    joystick_report_t r = {
+    static joystick_report_t;
+    r = (joystick_report_t) {
 #    if JOYSTICK_AXES_COUNT > 0
        .axes =
-            {
+        { joystick->axes[0],
-                joystick->axes[0],
 #        if JOYSTICK_AXES_COUNT >= 2
-                joystick->axes[1],
+          joystick->axes[1],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 3
-                joystick->axes[2],
+          joystick->axes[2],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 4
-                joystick->axes[3],
+          joystick->axes[3],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 5
-                joystick->axes[4],
+          joystick->axes[4],
 #        endif
 #        if JOYSTICK_AXES_COUNT >= 6
-                joystick->axes[5],
+          joystick->axes[5],
 #        endif
-            },
+        },
 #    endif  // JOYSTICK_AXES_COUNT>0
 #    if JOYSTICK_BUTTON_COUNT > 0
-        .buttons =
+        .buttons = {
-            {
+            joystick->buttons[0],
-                joystick->buttons[0],
 #        if JOYSTICK_BUTTON_COUNT > 8
-                joystick->buttons[1],
+            joystick->buttons[1],
 #        endif
 #        if JOYSTICK_BUTTON_COUNT > 16
-                joystick->buttons[2],
+            joystick->buttons[2],
 #        endif
 #        if JOYSTICK_BUTTON_COUNT > 24
-                joystick->buttons[3],
+            joystick->buttons[3],
 #        endif
-            }
+        }
 #    endif  // JOYSTICK_BUTTON_COUNT>0
    };
@@ -768,7 +767,8 @@ static void send_extra(uint8_t report_id, uint16_t data) {
    if (USB_DeviceState != DEVICE_STATE_Configured) return;
-    report_extra_t r = {.report_id = report_id, .usage = data};
+    static report_extra_t r;
+    r = (report_extra_t){.report_id = report_id, .usage = data};
    Endpoint_SelectEndpoint(SHARED_IN_EPNUM);
    /* Check if write ready for a polling interval around 10ms */
diff --git a/tmk_core/protocol/usb_descriptor.c b/tmk_core/protocol/usb_descriptor.c
index ba7760f28..c88aceb6e 100644
--- a/tmk_core/protocol/usb_descriptor.c
+++ b/tmk_core/protocol/usb_descriptor.c
@@ -351,7 +351,7 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor = {
        .Size                   = sizeof(USB_Descriptor_Device_t),
        .Type                   = DTYPE_Device
    },
-    .USBSpecification           = VERSION_BCD(1, 1, 0),
+    .USBSpecification           = VERSION_BCD(2, 0, 0),
 #if VIRTSER_ENABLE
    .Class                      = USB_CSCP_IADDeviceClass,
diff --git a/tmk_core/protocol/vusb/vusb.c b/tmk_core/protocol/vusb/vusb.c
index 9362fbde7..876a31378 100644
--- a/tmk_core/protocol/vusb/vusb.c
+++ b/tmk_core/protocol/vusb/vusb.c
@@ -272,7 +272,8 @@ static void send_extra(uint8_t report_id, uint16_t data) {
    last_id   = report_id;
    last_data = data;
-    report_extra_t report = {.report_id = report_id, .usage = data};
+    static report_extra_t report;
+    report = (report_extra_t){.report_id = report_id, .usage = data};
    if (usbInterruptIsReadyShared()) {
        usbSetInterruptShared((void *)&report, sizeof(report_extra_t));
    }
diff --git a/tmk_core/rules.mk b/tmk_core/rules.mk
index fc2dc68be..597f7aa82 100644
--- a/tmk_core/rules.mk
+++ b/tmk_core/rules.mk
@@ -458,7 +458,7 @@ ifeq ($(findstring avr-gcc,$(CC)),avr-gcc)
 SIZE_MARGIN = 1024
 check-size:
-        $(eval MAX_SIZE=$(shell n=`$(CC) -E -mmcu=$(MCU) $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | sed -ne 's/\r//;/^#/n;/^AVR_SIZE:/,$${s/^AVR_SIZE: //;p;}'` && echo $$(($$n)) || echo 0))
+        $(eval MAX_SIZE=$(shell n=`$(CC) -E -mmcu=$(MCU) -D__ASSEMBLER__ $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | sed -ne 's/\r//;/^#/n;/^AVR_SIZE:/,$${s/^AVR_SIZE: //;p;}'` && echo $$(($$n)) || echo 0))
        $(eval CURRENT_SIZE=$(shell if [ -f $(BUILD_DIR)/$(TARGET).hex ]; then $(SIZE) --target=$(FORMAT) $(BUILD_DIR)/$(TARGET).hex | $(AWK) 'NR==2 {print $$4}'; else printf 0; fi))
        $(eval FREE_SIZE=$(shell expr $(MAX_SIZE) - $(CURRENT_SIZE)))
        $(eval OVER_SIZE=$(shell expr $(CURRENT_SIZE) - $(MAX_SIZE)))