diff --git a/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.h b/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.h
index 61807f026d..e3cfe00e61 100644
--- a/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.h
+++ b/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.h
@@ -160,9 +160,6 @@ uint8_t HAL_get_reset_source(void);
 
 void _delay_ms(const int delay);
 
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-function"
-
 /*
 extern "C" {
   int freeMemory(void);
@@ -172,14 +169,17 @@ extern "C" {
 extern "C" char* _sbrk(int incr);
 
 /*
-static int freeMemory() {
+int freeMemory() {
   volatile int top;
   top = (int)((char*)&top - reinterpret_cast<char*>(_sbrk(0)));
   return top;
 }
 */
 
-static int freeMemory() {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+
+static inline int freeMemory(void) {
   volatile char top;
   return &top - reinterpret_cast<char*>(_sbrk(0));
 }
diff --git a/Marlin/src/HAL/HAL_STM32_F4_F7/fastio_STM32_F4_F7.h b/Marlin/src/HAL/HAL_STM32_F4_F7/fastio_STM32_F4_F7.h
index d65900540d..566f1a0851 100644
--- a/Marlin/src/HAL/HAL_STM32_F4_F7/fastio_STM32_F4_F7.h
+++ b/Marlin/src/HAL/HAL_STM32_F4_F7/fastio_STM32_F4_F7.h
@@ -27,6 +27,10 @@
  * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
  */
 
+#ifndef PWM
+  #define PWM OUTPUT
+#endif
+
 #define READ(IO)                digitalRead(IO)
 #define WRITE(IO,V)             digitalWrite(IO,V)
 
@@ -61,6 +65,8 @@
 #define PORTC 2
 #define PORTD 3
 #define PORTE 4
+#define PORTF 5
+#define PORTG 6
 
 #define _STM32_PIN(P,PN) ((PORT##P * 16) + PN)
 
diff --git a/Marlin/src/HAL/shared/Marduino.h b/Marlin/src/HAL/shared/Marduino.h
index 891646daab..4376579f85 100644
--- a/Marlin/src/HAL/shared/Marduino.h
+++ b/Marlin/src/HAL/shared/Marduino.h
@@ -31,6 +31,7 @@
 #undef sq             // Redefined by teensy3/wiring.h
 #undef SBI            // Redefined by arduino/const_functions.h
 #undef CBI            // Redefined by arduino/const_functions.h
+#undef UNUSED         // Redefined by stm32f4xx_hal_def.h
 
 #include <Arduino.h>  // NOTE: If included earlier then this line is a NOOP
 
@@ -74,3 +75,8 @@
 #ifndef M_PI
   #define M_PI 3.14159265358979323846f
 #endif
+
+// Remove compiler warning on an unused variable
+#ifndef UNUSED
+  #define UNUSED(x) ((void)(x))
+#endif
diff --git a/Marlin/src/core/macros.h b/Marlin/src/core/macros.h
index eb2b41d65b..ce72247c5d 100644
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@@ -53,15 +53,6 @@
 // Nanoseconds per cycle
 #define NANOSECONDS_PER_CYCLE (1000000000.0 / F_CPU)
 
-// Remove compiler warning on an unused variable
-#ifndef UNUSED
-  #if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
-    #define UNUSED(X) (void)X
-  #else
-    #define UNUSED(x) ((void)(x))
-  #endif
-#endif
-
 // Macros to make a string from a macro
 #define STRINGIFY_(M) #M
 #define STRINGIFY(M) STRINGIFY_(M)
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index d917ecb107..19755dd68c 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -390,11 +390,11 @@
   #error "STRING_SPLASH_LINE[12] are now obsolete. Please remove them from Configuration.h."
 #endif
 
-#define BOARD_MKS_13        -1109
-#define BOARD_TRIGORILLA    -1131
-#define BOARD_RURAMPS4D     -3020
-#define BOARD_FORMBOT_TREX2 -1125
-#define BOARD_BIQU_SKR_V1_1 -2014
+#define BOARD_MKS_13        -1000
+#define BOARD_TRIGORILLA    -1001
+#define BOARD_RURAMPS4D     -1002
+#define BOARD_FORMBOT_TREX2 -1003
+#define BOARD_BIQU_SKR_V1_1 -1004
 #if MB(MKS_13)
   #error "BOARD_MKS_13 has been renamed BOARD_MKS_GEN_13. Please update your configuration."
 #elif MB(TRIGORILLA)
@@ -403,8 +403,8 @@
   #error "BOARD_RURAMPS4D has been renamed BOARD_RURAMPS4D_11. Please update your configuration."
 #elif MB(FORMBOT_TREX2)
   #error "FORMBOT_TREX2 has been renamed BOARD_FORMBOT_TREX2PLUS. Please update your configuration."
-#elif MB(BOARD_BIQU_SKR_V1_1)
-  #error "BIQU_SKR_V1_1 has been renamed BOARD_BIGTREE_SKR_V1_1. Please update your configuration."
+#elif MB(BIQU_SKR_V1_1)
+  #error "BOARD_BIQU_SKR_V1_1 has been renamed BOARD_BIGTREE_SKR_V1_1. Please update your configuration."
 #endif
 #undef BOARD_MKS_13
 #undef BOARD_TRIGORILLA
diff --git a/Marlin/src/lcd/dogm/HAL_LCD_com_defines.h b/Marlin/src/lcd/dogm/HAL_LCD_com_defines.h
index 215ab29a2f..15048725f6 100644
--- a/Marlin/src/lcd/dogm/HAL_LCD_com_defines.h
+++ b/Marlin/src/lcd/dogm/HAL_LCD_com_defines.h
@@ -63,7 +63,10 @@
     #define U8G_COM_ST7920_HAL_HW_SPI u8g_com_arduino_st7920_hw_spi_fn
   #endif
 
-  uint8_t u8g_com_HAL_LPC1768_ssd_hw_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
+  #ifdef TARGET_LPC1768
+    uint8_t u8g_com_HAL_LPC1768_ssd_hw_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
+  #endif
+
   #define U8G_COM_SSD_I2C_HAL u8g_com_arduino_ssd_i2c_fn
 
   #if PIN_EXISTS(FSMC_CS)
@@ -73,7 +76,8 @@
     #define U8G_COM_HAL_FSMC_FN u8g_com_null_fn
   #endif
 
-#elif TARGET_LPC1768
+#elif defined(TARGET_LPC1768)
+
   uint8_t u8g_com_HAL_LPC1768_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
   #define U8G_COM_HAL_SW_SPI_FN u8g_com_HAL_LPC1768_sw_spi_fn
 
@@ -92,6 +96,7 @@
   #define U8G_COM_HAL_FSMC_FN u8g_com_null_fn
 
 #else  // need to give them some definition or else get compiler errors
+
   uint8_t u8g_com_null_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
   #define U8G_COM_HAL_SW_SPI_FN u8g_com_null_fn
   #define U8G_COM_HAL_HW_SPI_FN u8g_com_null_fn
@@ -99,4 +104,5 @@
   #define U8G_COM_ST7920_HAL_HW_SPI u8g_com_null_fn
   #define U8G_COM_SSD_I2C_HAL u8g_com_null_fn
   #define U8G_COM_HAL_FSMC_FN u8g_com_null_fn
+
 #endif
diff --git a/Marlin/src/pins/ramps/pins_RAMPS.h b/Marlin/src/pins/ramps/pins_RAMPS.h
index 1ed9e32d24..0c40709625 100644
--- a/Marlin/src/pins/ramps/pins_RAMPS.h
+++ b/Marlin/src/pins/ramps/pins_RAMPS.h
@@ -45,7 +45,7 @@
  *         7 | 11
  */
 
-#if ENABLED(TARGET_LPC1768)
+#ifdef TARGET_LPC1768
   #error "Oops! Set MOTHERBOARD to an LPC1768-based board when building for LPC1768."
 #elif defined(__STM32F1__)
   #error "Oops! Set MOTHERBOARD to an STM32F1-based board when building for STM32F1."
diff --git a/Marlin/src/pins/stm32/pins_STM32F4.h b/Marlin/src/pins/stm32/pins_STM32F4.h
index 43875ac3b4..48ae32f108 100644
--- a/Marlin/src/pins/stm32/pins_STM32F4.h
+++ b/Marlin/src/pins/stm32/pins_STM32F4.h
@@ -32,7 +32,9 @@
 
 //#define I2C_EEPROM
 
-#define E2END 0xFFF // 4KB
+#ifndef E2END
+  #define E2END 0xFFF // 4KB
+#endif
 
 // Ignore temp readings during development.
 //#define BOGUS_TEMPERATURE_GRACE_PERIOD 2000