diff --git a/Marlin/src/HAL/HAL_AVR/HAL.h b/Marlin/src/HAL/HAL_AVR/HAL.h
index 0d2a1bc2c7..e6d9683675 100644
--- a/Marlin/src/HAL/HAL_AVR/HAL.h
+++ b/Marlin/src/HAL/HAL_AVR/HAL.h
@@ -25,7 +25,7 @@
 #include "math.h"
 
 #ifdef USBCON
-  #include "HardwareSerial.h"
+  #include <HardwareSerial.h>
 #else
   #define HardwareSerial_h // Hack to prevent HardwareSerial.h header inclusion
   #include "MarlinSerial.h"
diff --git a/Marlin/src/HAL/HAL_ESP32/WebSocketSerial.h b/Marlin/src/HAL/HAL_ESP32/WebSocketSerial.h
index 9590271b01..85436d151b 100644
--- a/Marlin/src/HAL/HAL_ESP32/WebSocketSerial.h
+++ b/Marlin/src/HAL/HAL_ESP32/WebSocketSerial.h
@@ -23,7 +23,7 @@
 
 #include "../../inc/MarlinConfig.h"
 
-#include "Stream.h"
+#include <Stream.h>
 
 #ifndef RX_BUFFER_SIZE
   #define RX_BUFFER_SIZE 128
diff --git a/Marlin/src/HAL/HAL_ESP32/i2s.cpp b/Marlin/src/HAL/HAL_ESP32/i2s.cpp
index 1f7c508cf1..33a503455c 100644
--- a/Marlin/src/HAL/HAL_ESP32/i2s.cpp
+++ b/Marlin/src/HAL/HAL_ESP32/i2s.cpp
@@ -26,10 +26,10 @@
 #include "i2s.h"
 
 #include "../shared/Marduino.h"
-#include "driver/periph_ctrl.h"
-#include "rom/lldesc.h"
-#include "soc/i2s_struct.h"
-#include "freertos/queue.h"
+#include <driver/periph_ctrl.h>
+#include <rom/lldesc.h>
+#include <soc/i2s_struct.h>
+#include <freertos/queue.h>
 #include "../../module/stepper.h"
 
 #define DMA_BUF_COUNT 8                                // number of DMA buffers to store data
diff --git a/Marlin/src/HAL/HAL_ESP32/ota.cpp b/Marlin/src/HAL/HAL_ESP32/ota.cpp
index 98ea3b5eb7..377856f8d8 100644
--- a/Marlin/src/HAL/HAL_ESP32/ota.cpp
+++ b/Marlin/src/HAL/HAL_ESP32/ota.cpp
@@ -27,7 +27,7 @@
 #include <ESPmDNS.h>
 #include <WiFiUdp.h>
 #include <ArduinoOTA.h>
-#include "driver/timer.h"
+#include <driver/timer.h>
 
 void OTA_init() {
   ArduinoOTA
diff --git a/Marlin/src/HAL/HAL_ESP32/timers.cpp b/Marlin/src/HAL/HAL_ESP32/timers.cpp
index 79a79e37cd..543889760e 100644
--- a/Marlin/src/HAL/HAL_ESP32/timers.cpp
+++ b/Marlin/src/HAL/HAL_ESP32/timers.cpp
@@ -23,10 +23,10 @@
 #ifdef ARDUINO_ARCH_ESP32
 
 #include <stdio.h>
-#include "esp_types.h"
-#include "soc/timer_group_struct.h"
-#include "driver/periph_ctrl.h"
-#include "driver/timer.h"
+#include <esp_types.h>
+#include <soc/timer_group_struct.h>
+#include <driver/periph_ctrl.h>
+#include <driver/timer.h>
 
 #include "HAL.h"
 
diff --git a/Marlin/src/HAL/HAL_ESP32/timers.h b/Marlin/src/HAL/HAL_ESP32/timers.h
index 98e43a4a80..e6e3495bea 100644
--- a/Marlin/src/HAL/HAL_ESP32/timers.h
+++ b/Marlin/src/HAL/HAL_ESP32/timers.h
@@ -22,7 +22,7 @@
 #pragma once
 
 #include <stdint.h>
-#include "driver/timer.h"
+#include <driver/timer.h>
 
 // Includes needed to get I2S_STEPPER_STREAM. Note that pins.h
 // is included in case this header is being included early.
diff --git a/Marlin/src/HAL/HAL_LPC1768/HAL_SPI.cpp b/Marlin/src/HAL/HAL_LPC1768/HAL_SPI.cpp
index bfbf35c049..5f32c7874d 100644
--- a/Marlin/src/HAL/HAL_LPC1768/HAL_SPI.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/HAL_SPI.cpp
@@ -56,7 +56,7 @@
 // ------------------------
 #if ENABLED(LPC_SOFTWARE_SPI)
 
-  #include "SoftwareSPI.h"
+  #include <SoftwareSPI.h>
 
   // Software SPI
 
diff --git a/Marlin/src/HAL/HAL_LPC1768/persistent_store_flash.cpp b/Marlin/src/HAL/HAL_LPC1768/persistent_store_flash.cpp
index dac7d7a3a9..3de02022eb 100644
--- a/Marlin/src/HAL/HAL_LPC1768/persistent_store_flash.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/persistent_store_flash.cpp
@@ -46,7 +46,7 @@
 #if ENABLED(FLASH_EEPROM_EMULATION)
 
 extern "C" {
-  #include "lpc17xx_iap.h"
+  #include <lpc17xx_iap.h>
 }
 
 #define SECTOR_START(sector)  ((sector < 16) ? (sector * 0x1000) : ((sector - 14) * 0x8000))
diff --git a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_sw_spi.cpp b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_sw_spi.cpp
index 59414e896b..0a1bd84875 100644
--- a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_sw_spi.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_sw_spi.cpp
@@ -60,7 +60,7 @@
 #if ENABLED(U8GLIB_ST7920)
 
 #include <U8glib.h>
-#include "SoftwareSPI.h"
+#include <SoftwareSPI.h>
 #include "../../shared/Delay.h"
 
 #undef SPI_SPEED
diff --git a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_sw_spi.cpp b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_sw_spi.cpp
index 479b3811d5..7b6557148a 100644
--- a/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_sw_spi.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_sw_spi.cpp
@@ -59,7 +59,7 @@
 
 #if HAS_GRAPHICAL_LCD && DISABLED(U8GLIB_ST7920)
 
-#include "SoftwareSPI.h"
+#include <SoftwareSPI.h>
 
 #undef SPI_SPEED
 #define SPI_SPEED 2  // About 2 MHz
diff --git a/Marlin/src/HAL/HAL_LPC1768/watchdog.cpp b/Marlin/src/HAL/HAL_LPC1768/watchdog.cpp
index f122bf9984..6d0200e9f1 100644
--- a/Marlin/src/HAL/HAL_LPC1768/watchdog.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/watchdog.cpp
@@ -26,7 +26,7 @@
 
 #if ENABLED(USE_WATCHDOG)
 
-#include "lpc17xx_wdt.h"
+#include <lpc17xx_wdt.h>
 #include "watchdog.h"
 
 void watchdog_init() {
diff --git a/Marlin/src/HAL/HAL_SAMD51/HAL.cpp b/Marlin/src/HAL/HAL_SAMD51/HAL.cpp
index 35863477e8..1c53042f8d 100644
--- a/Marlin/src/HAL/HAL_SAMD51/HAL.cpp
+++ b/Marlin/src/HAL/HAL_SAMD51/HAL.cpp
@@ -22,8 +22,8 @@
 #ifdef __SAMD51__
 
 #include "../../inc/MarlinConfig.h"
-#include "Adafruit_ZeroDMA.h"
-#include "wiring_private.h"
+#include <Adafruit_ZeroDMA.h>
+#include <wiring_private.h>
 
 // ------------------------
 // Local defines
diff --git a/Marlin/src/HAL/HAL_STM32/HAL.cpp b/Marlin/src/HAL/HAL_STM32/HAL.cpp
index 1d8eb44470..4fbfa7298c 100644
--- a/Marlin/src/HAL/HAL_STM32/HAL.cpp
+++ b/Marlin/src/HAL/HAL_STM32/HAL.cpp
@@ -36,13 +36,13 @@
 
 #if HAS_SWSERIAL
   #include "SoftwareSerial.h"
-#endif  
+#endif
 
 #if ENABLED(SRAM_EEPROM_EMULATION)
   #if STM32F7xx
-    #include "stm32f7xx_ll_pwr.h"
+    #include <stm32f7xx_ll_pwr.h>
   #elif STM32F4xx
-    #include "stm32f4xx_ll_pwr.h"
+    #include <stm32f4xx_ll_pwr.h>
   #else
     #error "SRAM_EEPROM_EMULATION is currently only supported for STM32F4xx and STM32F7xx"
   #endif
diff --git a/Marlin/src/HAL/HAL_STM32/timers.cpp b/Marlin/src/HAL/HAL_STM32/timers.cpp
index 709c447b08..c2a4cbdc0e 100644
--- a/Marlin/src/HAL/HAL_STM32/timers.cpp
+++ b/Marlin/src/HAL/HAL_STM32/timers.cpp
@@ -91,7 +91,7 @@ void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
     // This is fixed in Arduino_Core_STM32 1.8.
     // These calls can be removed and replaced with
     // timer_instance[timer_num]->setInterruptPriority
-    switch (timer_num) {                 
+    switch (timer_num) {
       case STEP_TIMER_NUM:
         HAL_NVIC_SetPriority(STEP_TIMER_IRQ_NAME, STEP_TIMER_IRQ_PRIO, 0);
         break;
diff --git a/Marlin/src/HAL/HAL_STM32F1/HAL.cpp b/Marlin/src/HAL/HAL_STM32F1/HAL.cpp
index cba41dd3c2..afd6eff027 100644
--- a/Marlin/src/HAL/HAL_STM32F1/HAL.cpp
+++ b/Marlin/src/HAL/HAL_STM32F1/HAL.cpp
@@ -272,7 +272,7 @@ extern "C" {
 // return free memory between end of heap (or end bss) and whatever is current
 
 /*
-#include "wirish/syscalls.c"
+#include <wirish/syscalls.c>
 //extern caddr_t _sbrk(int incr);
 #ifndef CONFIG_HEAP_END
 extern char _lm_heap_end;
diff --git a/Marlin/src/HAL/HAL_STM32F1/SoftwareSerial.h b/Marlin/src/HAL/HAL_STM32F1/SoftwareSerial.h
index 0692b7e9f3..330d7d632d 100644
--- a/Marlin/src/HAL/HAL_STM32F1/SoftwareSerial.h
+++ b/Marlin/src/HAL/HAL_STM32F1/SoftwareSerial.h
@@ -20,7 +20,9 @@
 
 #include <stdint.h>
 
-#define SW_SERIAL_PLACEHOLDER 1
+#ifndef HAVE_SW_SERIAL
+   #define SW_SERIAL_PLACEHOLDER 1
+#endif
 
 class SoftwareSerial {
 public:
diff --git a/Marlin/src/HAL/HAL_STM32F1/inc/SanityCheck.h b/Marlin/src/HAL/HAL_STM32F1/inc/SanityCheck.h
index f356c0da07..69466a0a77 100644
--- a/Marlin/src/HAL/HAL_STM32F1/inc/SanityCheck.h
+++ b/Marlin/src/HAL/HAL_STM32F1/inc/SanityCheck.h
@@ -36,3 +36,8 @@
 #if ENABLED(FAST_PWM_FAN)
   #error "FAST_PWM_FAN is not yet implemented for this platform."
 #endif
+
+#if !defined(HAVE_SW_SERIAL) && HAS_TMC220x
+  #warning "With TMC2208/9 consider using SoftwareSerialM with HAVE_SW_SERIAL and appropriate SS_TIMER."
+  #error "Missing SoftwareSerial implementation."
+#endif
diff --git a/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.cpp b/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.cpp
index 7ed6e2c10f..e24483f642 100644
--- a/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.cpp
+++ b/Marlin/src/HAL/HAL_STM32_F4_F7/HAL.cpp
@@ -64,7 +64,7 @@ extern "C" {
 // return free memory between end of heap (or end bss) and whatever is current
 
 /*
-#include "wirish/syscalls.c"
+#include <wirish/syscalls.c>
 //extern caddr_t _sbrk(int incr);
 #ifndef CONFIG_HEAP_END
 extern char _lm_heap_end;
diff --git a/Marlin/src/core/drivers.h b/Marlin/src/core/drivers.h
index 4400e0d785..44434581a5 100644
--- a/Marlin/src/core/drivers.h
+++ b/Marlin/src/core/drivers.h
@@ -133,7 +133,7 @@
                                        || HAS_E_DRIVER(TMC2660_STANDALONE) \
                                        || HAS_E_DRIVER(TMC2209_STANDALONE) \
                                        || HAS_E_DRIVER(TMC5130_STANDALONE) \
-                                       || HAS_E_DRIVER(TMC5160_STANDALONE) )                   
+                                       || HAS_E_DRIVER(TMC5160_STANDALONE) )
 //
 // Stretching 'drivers.h' to include LPC/SAMD51 SD options
 //
diff --git a/buildroot/share/PlatformIO/variants/BIGTREE_SKR_PRO_1v1/PeripheralPins.c b/buildroot/share/PlatformIO/variants/BIGTREE_SKR_PRO_1v1/PeripheralPins.c
index 9b92ee60a0..a3f800baa4 100644
--- a/buildroot/share/PlatformIO/variants/BIGTREE_SKR_PRO_1v1/PeripheralPins.c
+++ b/buildroot/share/PlatformIO/variants/BIGTREE_SKR_PRO_1v1/PeripheralPins.c
@@ -122,7 +122,7 @@ const PinMap PinMap_PWM[] = {
   {PE_5,  TIM9,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 1, 0)}, // TIM9_CH1    FAN1
   {PE_6,  TIM9,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM9, 2, 0)}, // TIM9_CH2    FAN2
   {PC_9,  TIM8,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_TIM8, 4, 0)}, // TIM8_CH4    EXTENSION1-4
-  
+
   //probably unused on SKR-Pro. confirmation needed, please.
   //{PA_0,  TIM2,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
   //{PA_0,  TIM5,   STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM5, 1, 0)}, // TIM5_CH1
diff --git a/platformio.ini b/platformio.ini
index 5904ee8371..11db00a6b2 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -301,9 +301,10 @@ board             = genericSTM32F103RC
 platform_packages = tool-stm32duino
 extra_scripts     = buildroot/share/PlatformIO/scripts/STM32F103RC_SKR_MINI.py
 build_flags       = !python Marlin/src/HAL/HAL_STM32F1/build_flags.py
-  ${common.build_flags} -DDEBUG_LEVEL=0 -std=gnu++14
+  ${common.build_flags} -DDEBUG_LEVEL=0 -std=gnu++14 -DHAVE_SW_SERIAL -DSS_TIMER=4
 build_unflags     = -std=gnu++11
 lib_deps          = ${common.lib_deps}
+  SoftwareSerialM=https://github.com/FYSETC/SoftwareSerialM/archive/master.zip
 lib_ignore        = Adafruit NeoPixel, SPI
 src_filter        = ${common.default_src_filter} +<src/HAL/HAL_STM32F1>
 monitor_speed     = 115200
@@ -315,9 +316,10 @@ board             = genericSTM32F103RC
 platform_packages = tool-stm32duino
 extra_scripts     = buildroot/share/PlatformIO/scripts/STM32F103RC_SKR_MINI.py
 build_flags       = !python Marlin/src/HAL/HAL_STM32F1/build_flags.py
-  ${common.build_flags} -DDEBUG_LEVEL=0 -std=gnu++14 -DUSE_USB_COMPOSITE
+  ${common.build_flags} -DDEBUG_LEVEL=0 -std=gnu++14 -DUSE_USB_COMPOSITE -DHAVE_SW_SERIAL -DSS_TIMER=4
 build_unflags     = -std=gnu++11
 lib_deps          = ${common.lib_deps}
+  SoftwareSerialM=https://github.com/FYSETC/SoftwareSerialM/archive/master.zip
 lib_ignore        = Adafruit NeoPixel, SPI
 src_filter        = ${common.default_src_filter} +<src/HAL/HAL_STM32F1>
 monitor_speed     = 115200