diff --git a/.github/workflows/test-builds.yml b/.github/workflows/test-builds.yml
index fdb81fbdc..35cd920ad 100644
--- a/.github/workflows/test-builds.yml
+++ b/.github/workflows/test-builds.yml
@@ -70,6 +70,7 @@ jobs:
         - mks_robin_stm32
         - ARMED
         - FYSETC_S6
+        - STM32F070CB_malyan
         - STM32F070RB_malyan
         - malyan_M300
         - mks_robin_lite
diff --git a/Marlin/Makefile b/Marlin/Makefile
index 95135ab59..5ab0d1eef 100644
--- a/Marlin/Makefile
+++ b/Marlin/Makefile
@@ -694,7 +694,7 @@ ifeq ($(HARDWARE_VARIANT), Teensy)
   LIB_CXXSRC += usb_api.cpp
 
 else ifeq ($(HARDWARE_VARIANT), archim)
-  CDEFS      += -DARDUINO_SAM_ARCHIM -DARDUINO_ARCH_SAM -D__SAM3X8E__ -DUSB_VID=0x27b1 -DUSB_PID=0x0001 -DUSBCON '-DUSB_MANUFACTURER="UltiMachine"' '-DUSB_PRODUCT="Archim"'
+  CDEFS      += -DARDUINO_SAM_ARCHIM -DARDUINO_ARCH_SAM -D__SAM3X8E__ -DUSB_VID=0x27b1 -DUSB_PID=0x0001 -DUSBCON '-DUSB_MANUFACTURER="UltiMachine"' '-DUSB_PRODUCT_STRING="Archim"'
   LIB_CXXSRC += variant.cpp IPAddress.cpp Reset.cpp RingBuffer.cpp Stream.cpp UARTClass.cpp  USARTClass.cpp abi.cpp new.cpp watchdog.cpp CDC.cpp PluggableUSB.cpp USBCore.cpp
   LIB_SRC    += cortex_handlers.c iar_calls_sam3.c syscalls_sam3.c dtostrf.c itoa.c
 
diff --git a/Marlin/src/HAL/STM32/SoftwareSerial.cpp b/Marlin/src/HAL/STM32/SoftwareSerial.cpp
deleted file mode 100644
index 2228a177b..000000000
--- a/Marlin/src/HAL/STM32/SoftwareSerial.cpp
+++ /dev/null
@@ -1,396 +0,0 @@
-/*
- * SoftwareSerial.cpp (formerly NewSoftSerial.cpp)
- *
- * Multi-instance software serial library for Arduino/Wiring
- * -- Interrupt-driven receive and other improvements by ladyada
- *    <https://ladyada.net>
- * -- Tuning, circular buffer, derivation from class Print/Stream,
- *    multi-instance support, porting to 8MHz processors,
- *    various optimizations, PROGMEM delay tables, inverse logic and
- *    direct port writing by Mikal Hart <http://www.arduiniana.org>
- * -- Pin change interrupt macros by Paul Stoffregen <https://www.pjrc.com>
- * -- 20MHz processor support by Garrett Mace <http://www.macetech.com>
- * -- ATmega1280/2560 support by Brett Hagman <https://www.roguerobotics.com>
- * -- STM32 support by Armin van der Togt
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- *
- * The latest version of this library can always be found at
- * http://arduiniana.org.
- */
-
-//
-// Includes
-//
-#if defined(PLATFORMIO) && defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
-
-#include "../../inc/MarlinConfig.h"
-
-#include "SoftwareSerial.h"
-
-#define OVERSAMPLE 3 // in RX, Timer will generate interruption OVERSAMPLE time during a bit. Thus OVERSAMPLE ticks in a bit. (interrupt not synchonized with edge).
-
-// defined in bit-periods
-#define HALFDUPLEX_SWITCH_DELAY 5
-// It's best to define TIMER_SERIAL in variant.h. If not defined, we choose one here
-// The order is based on (lack of) features and compare channels, we choose the simplest available
-// because we only need an update interrupt
-#if !defined(TIMER_SERIAL)
-#if  defined(TIM18_BASE)
-#define TIMER_SERIAL TIM18
-#elif defined(TIM7_BASE)
-#define TIMER_SERIAL TIM7
-#elif defined(TIM6_BASE)
-#define TIMER_SERIAL TIM6
-#elif defined(TIM22_BASE)
-#define TIMER_SERIAL TIM22
-#elif defined(TIM21_BASE)
-#define TIMER_SERIAL TIM21
-#elif defined(TIM17_BASE)
-#define TIMER_SERIAL TIM17
-#elif defined(TIM16_BASE)
-#define TIMER_SERIAL TIM16
-#elif defined(TIM15_BASE)
-#define TIMER_SERIAL TIM15
-#elif defined(TIM14_BASE)
-#define TIMER_SERIAL TIM14
-#elif defined(TIM13_BASE)
-#define TIMER_SERIAL TIM13
-#elif defined(TIM11_BASE)
-#define TIMER_SERIAL TIM11
-#elif defined(TIM10_BASE)
-#define TIMER_SERIAL TIM10
-#elif defined(TIM12_BASE)
-#define TIMER_SERIAL TIM12
-#elif defined(TIM19_BASE)
-#define TIMER_SERIAL TIM19
-#elif defined(TIM9_BASE)
-#define TIMER_SERIAL TIM9
-#elif defined(TIM5_BASE)
-#define TIMER_SERIAL TIM5
-#elif defined(TIM4_BASE)
-#define TIMER_SERIAL TIM4
-#elif defined(TIM3_BASE)
-#define TIMER_SERIAL TIM3
-#elif defined(TIM2_BASE)
-#define TIMER_SERIAL TIM2
-#elif defined(TIM20_BASE)
-#define TIMER_SERIAL TIM20
-#elif defined(TIM8_BASE)
-#define TIMER_SERIAL TIM8
-#elif defined(TIM1_BASE)
-#define TIMER_SERIAL TIM1
-#else
-#error No suitable timer found for SoftwareSerial, define TIMER_SERIAL in variant.h
-#endif
-#endif
-//
-// Statics
-//
-HardwareTimer SoftwareSerial::timer(TIMER_SERIAL);
-const IRQn_Type SoftwareSerial::timer_interrupt_number = static_cast<IRQn_Type>(getTimerUpIrq(TIMER_SERIAL));
-uint32_t SoftwareSerial::timer_interrupt_priority = NVIC_EncodePriority(NVIC_GetPriorityGrouping(), TIM_IRQ_PRIO, TIM_IRQ_SUBPRIO);
-SoftwareSerial *SoftwareSerial::active_listener = nullptr;
-SoftwareSerial *volatile SoftwareSerial::active_out = nullptr;
-SoftwareSerial *volatile SoftwareSerial::active_in = nullptr;
-int32_t SoftwareSerial::tx_tick_cnt = 0; // OVERSAMPLE ticks needed for a bit
-int32_t volatile SoftwareSerial::rx_tick_cnt = 0;  // OVERSAMPLE ticks needed for a bit
-uint32_t SoftwareSerial::tx_buffer = 0;
-int32_t SoftwareSerial::tx_bit_cnt = 0;
-uint32_t SoftwareSerial::rx_buffer = 0;
-int32_t SoftwareSerial::rx_bit_cnt = -1; // rx_bit_cnt = -1 :  waiting for start bit
-uint32_t SoftwareSerial::cur_speed = 0;
-
-void SoftwareSerial::setInterruptPriority(uint32_t preemptPriority, uint32_t subPriority) {
-  timer_interrupt_priority = NVIC_EncodePriority(NVIC_GetPriorityGrouping(), preemptPriority, subPriority);
-}
-
-//
-// Private methods
-//
-
-void SoftwareSerial::setSpeed(uint32_t speed) {
-  if (speed != cur_speed) {
-    timer.pause();
-    if (speed != 0) {
-      // Disable the timer
-      uint32_t clock_rate, cmp_value;
-      // Get timer clock
-      clock_rate = timer.getTimerClkFreq();
-      int pre = 1;
-      // Calculate prescale an compare value
-      do {
-        cmp_value = clock_rate / (speed * OVERSAMPLE);
-        if (cmp_value >= UINT16_MAX) {
-          clock_rate /= 2;
-          pre *= 2;
-        }
-      } while (cmp_value >= UINT16_MAX);
-      timer.setPrescaleFactor(pre);
-      timer.setOverflow(cmp_value);
-      timer.setCount(0);
-      timer.attachInterrupt(&handleInterrupt);
-      timer.resume();
-      NVIC_SetPriority(timer_interrupt_number, timer_interrupt_priority);
-    }
-    else
-      timer.detachInterrupt();
-    cur_speed = speed;
-  }
-}
-
-// This function sets the current object as the "listening"
-// one and returns true if it replaces another
-bool SoftwareSerial::listen() {
-  if (active_listener != this) {
-    // wait for any transmit to complete as we may change speed
-    while (active_out);
-    active_listener->stopListening();
-    rx_tick_cnt = 1; // 1 : next interrupt will decrease rx_tick_cnt to 0 which means RX pin level will be considered.
-    rx_bit_cnt = -1; // rx_bit_cnt = -1 :  waiting for start bit
-    setSpeed(_speed);
-    active_listener = this;
-    if (!_half_duplex) active_in = this;
-    return true;
-  }
-  return false;
-}
-
-// Stop listening. Returns true if we were actually listening.
-bool SoftwareSerial::stopListening() {
-  if (active_listener == this) {
-    // wait for any output to complete
-    while (active_out);
-    if (_half_duplex) setRXTX(false);
-    active_listener = nullptr;
-    active_in = nullptr;
-    // turn off ints
-    setSpeed(0);
-    return true;
-  }
-  return false;
-}
-
-inline void SoftwareSerial::setTX() {
-  if (_inverse_logic)
-    LL_GPIO_ResetOutputPin(_transmitPinPort, _transmitPinNumber);
-  else
-    LL_GPIO_SetOutputPin(_transmitPinPort, _transmitPinNumber);
-  pinMode(_transmitPin, OUTPUT);
-}
-
-inline void SoftwareSerial::setRX() {
-  pinMode(_receivePin, _inverse_logic ? INPUT_PULLDOWN : INPUT_PULLUP); // pullup for normal logic!
-}
-
-inline void SoftwareSerial::setRXTX(bool input) {
-  if (_half_duplex) {
-    if (input) {
-      if (active_in != this) {
-        setRX();
-        rx_bit_cnt = -1; // rx_bit_cnt = -1 :  waiting for start bit
-        rx_tick_cnt = 2; // 2 : next interrupt will be discarded. 2 interrupts required to consider RX pin level
-        active_in = this;
-      }
-    }
-    else {
-      if (active_in == this) {
-        setTX();
-        active_in = nullptr;
-      }
-    }
-  }
-}
-
-inline void SoftwareSerial::send() {
-  if (--tx_tick_cnt <= 0) { // if tx_tick_cnt > 0 interrupt is discarded. Only when tx_tick_cnt reaches 0 is TX pin set.
-    if (tx_bit_cnt++ < 10) { // tx_bit_cnt < 10 transmission is not finished (10 = 1 start +8 bits + 1 stop)
-      // Send data (including start and stop bits)
-      if (tx_buffer & 1)
-        LL_GPIO_SetOutputPin(_transmitPinPort, _transmitPinNumber);
-      else
-        LL_GPIO_ResetOutputPin(_transmitPinPort, _transmitPinNumber);
-      tx_buffer >>= 1;
-      tx_tick_cnt = OVERSAMPLE; // Wait OVERSAMPLE ticks to send next bit
-    }
-    else { // Transmission finished
-      tx_tick_cnt = 1;
-      if (_output_pending) {
-        active_out = nullptr;
-
-        // In half-duplex mode wait HALFDUPLEX_SWITCH_DELAY bit-periods after the byte has
-        // been transmitted before allowing the switch to RX mode
-      }
-      else if (tx_bit_cnt > 10 + OVERSAMPLE * HALFDUPLEX_SWITCH_DELAY) {
-        if (_half_duplex && active_listener == this) setRXTX(true);
-        active_out = nullptr;
-      }
-    }
-  }
-}
-
-//
-// The receive routine called by the interrupt handler
-//
-inline void SoftwareSerial::recv() {
-  if (--rx_tick_cnt <= 0) { // if rx_tick_cnt > 0 interrupt is discarded. Only when rx_tick_cnt reaches 0 is RX pin considered
-    bool inbit = LL_GPIO_IsInputPinSet(_receivePinPort, _receivePinNumber) ^ _inverse_logic;
-    if (rx_bit_cnt == -1) {  // rx_bit_cnt = -1 :  waiting for start bit
-      if (!inbit) {
-        // got start bit
-        rx_bit_cnt = 0; // rx_bit_cnt == 0 : start bit received
-        rx_tick_cnt = OVERSAMPLE + 1; // Wait 1 bit (OVERSAMPLE ticks) + 1 tick in order to sample RX pin in the middle of the edge (and not too close to the edge)
-        rx_buffer = 0;
-      }
-      else
-        rx_tick_cnt = 1; // Waiting for start bit, but wrong level. Wait for next Interrupt to check RX pin level
-    }
-    else if (rx_bit_cnt >= 8) { // rx_bit_cnt >= 8 : waiting for stop bit
-      if (inbit) {
-        // Stop-bit read complete. Add to buffer.
-        uint8_t next = (_receive_buffer_tail + 1) % _SS_MAX_RX_BUFF;
-        if (next != _receive_buffer_head) {
-          // save new data in buffer: tail points to byte destination
-          _receive_buffer[_receive_buffer_tail] = rx_buffer; // save new byte
-          _receive_buffer_tail = next;
-        }
-        else // rx_bit_cnt = x  with x = [0..7] correspond to new bit x received
-          _buffer_overflow = true;
-      }
-      // Full trame received. Restart waiting for start bit at next interrupt
-      rx_tick_cnt = 1;
-      rx_bit_cnt = -1;
-    }
-    else {
-      // data bits
-      rx_buffer >>= 1;
-      if (inbit) rx_buffer |= 0x80;
-      rx_bit_cnt++; // Prepare for next bit
-      rx_tick_cnt = OVERSAMPLE; // Wait OVERSAMPLE ticks before sampling next bit
-    }
-  }
-}
-
-//
-// Interrupt handling
-//
-
-/* static */
-inline void SoftwareSerial::handleInterrupt(HardwareTimer*) {
-  if (active_in)   active_in->recv();
-  if (active_out) active_out->send();
-}
-
-//
-// Constructor
-//
-SoftwareSerial::SoftwareSerial(uint16_t receivePin, uint16_t transmitPin, bool inverse_logic /* = false */) :
-  _receivePin(receivePin),
-  _transmitPin(transmitPin),
-  _receivePinPort(digitalPinToPort(receivePin)),
-  _receivePinNumber(STM_LL_GPIO_PIN(digitalPinToPinName(receivePin))),
-  _transmitPinPort(digitalPinToPort(transmitPin)),
-  _transmitPinNumber(STM_LL_GPIO_PIN(digitalPinToPinName(transmitPin))),
-  _speed(0),
-  _buffer_overflow(false),
-  _inverse_logic(inverse_logic),
-  _half_duplex(receivePin == transmitPin),
-  _output_pending(0),
-  _receive_buffer_tail(0),
-  _receive_buffer_head(0)
-{
-  if ((receivePin < NUM_DIGITAL_PINS) || (transmitPin < NUM_DIGITAL_PINS)) {
-    /* Enable GPIO clock for tx and rx pin*/
-    set_GPIO_Port_Clock(STM_PORT(digitalPinToPinName(transmitPin)));
-    set_GPIO_Port_Clock(STM_PORT(digitalPinToPinName(receivePin)));
-  }
-  else
-    _Error_Handler("ERROR: invalid pin number\n", -1);
-}
-
-//
-// Destructor
-//
-SoftwareSerial::~SoftwareSerial() { end(); }
-
-//
-// Public methods
-//
-
-void SoftwareSerial::begin(long speed) {
-  #ifdef FORCE_BAUD_RATE
-    speed = FORCE_BAUD_RATE;
-  #endif
-  _speed = speed;
-  if (!_half_duplex) {
-    setTX();
-    setRX();
-    listen();
-  }
-  else
-    setTX();
-}
-
-void SoftwareSerial::end() {
-  stopListening();
-}
-
-// Read data from buffer
-int SoftwareSerial::read() {
-  // Empty buffer?
-  if (_receive_buffer_head == _receive_buffer_tail) return -1;
-
-  // Read from "head"
-  uint8_t d = _receive_buffer[_receive_buffer_head]; // grab next byte
-  _receive_buffer_head = (_receive_buffer_head + 1) % _SS_MAX_RX_BUFF;
-  return d;
-}
-
-int SoftwareSerial::available() {
-  return (_receive_buffer_tail + _SS_MAX_RX_BUFF - _receive_buffer_head) % _SS_MAX_RX_BUFF;
-}
-
-size_t SoftwareSerial::write(uint8_t b) {
-  // wait for previous transmit to complete
-  _output_pending = 1;
-  while (active_out) { /* nada */ }
-  // add start and stop bits.
-  tx_buffer = b << 1 | 0x200;
-  if (_inverse_logic) tx_buffer = ~tx_buffer;
-  tx_bit_cnt = 0;
-  tx_tick_cnt = OVERSAMPLE;
-  setSpeed(_speed);
-  if (_half_duplex) setRXTX(false);
-  _output_pending = 0;
-  // make us active
-  active_out = this;
-  return 1;
-}
-
-void SoftwareSerial::flush() {
-  noInterrupts();
-  _receive_buffer_head = _receive_buffer_tail = 0;
-  interrupts();
-}
-
-int SoftwareSerial::peek() {
-  // Empty buffer?
-  if (_receive_buffer_head == _receive_buffer_tail) return -1;
-
-  // Read from "head"
-  return _receive_buffer[_receive_buffer_head];
-}
-
-#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
diff --git a/Marlin/src/HAL/STM32/SoftwareSerial.h b/Marlin/src/HAL/STM32/SoftwareSerial.h
deleted file mode 100644
index 1a4f742c3..000000000
--- a/Marlin/src/HAL/STM32/SoftwareSerial.h
+++ /dev/null
@@ -1,114 +0,0 @@
-/**
- * SoftwareSerial.h (formerly NewSoftSerial.h)
- *
- * Multi-instance software serial library for Arduino/Wiring
- * -- Interrupt-driven receive and other improvements by ladyada
- *    (https://ladyada.net)
- * -- Tuning, circular buffer, derivation from class Print/Stream,
- *    multi-instance support, porting to 8MHz processors,
- *    various optimizations, PROGMEM delay tables, inverse logic and
- *    direct port writing by Mikal Hart (http://www.arduiniana.org)
- * -- Pin change interrupt macros by Paul Stoffregen (https://www.pjrc.com)
- * -- 20MHz processor support by Garrett Mace (http://www.macetech.com)
- * -- ATmega1280/2560 support by Brett Hagman (https://www.roguerobotics.com/)
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- *
- * The latest version of this library can always be found at
- * http://arduiniana.org.
- */
-#pragma once
-
-#include <Arduino.h>
-
-/******************************************************************************
- * Definitions
- ******************************************************************************/
-
-#define _SS_MAX_RX_BUFF 64 // RX buffer size
-
-class SoftwareSerial : public Stream {
-  private:
-    // per object data
-    uint16_t _receivePin;
-    uint16_t _transmitPin;
-    GPIO_TypeDef *_receivePinPort;
-    uint32_t _receivePinNumber;
-    GPIO_TypeDef *_transmitPinPort;
-    uint32_t _transmitPinNumber;
-    uint32_t _speed;
-
-    uint16_t _buffer_overflow: 1;
-    uint16_t _inverse_logic: 1;
-    uint16_t _half_duplex: 1;
-    uint16_t _output_pending: 1;
-
-    unsigned char _receive_buffer[_SS_MAX_RX_BUFF];
-    volatile uint8_t _receive_buffer_tail;
-    volatile uint8_t _receive_buffer_head;
-
-    uint32_t delta_start = 0;
-
-    // static data
-    static HardwareTimer timer;
-    static const IRQn_Type timer_interrupt_number;
-    static uint32_t timer_interrupt_priority;
-    static SoftwareSerial *active_listener;
-    static SoftwareSerial *volatile active_out;
-    static SoftwareSerial *volatile active_in;
-    static int32_t tx_tick_cnt;
-    static volatile int32_t rx_tick_cnt;
-    static uint32_t tx_buffer;
-    static int32_t tx_bit_cnt;
-    static uint32_t rx_buffer;
-    static int32_t rx_bit_cnt;
-    static uint32_t cur_speed;
-
-    // private methods
-    void send();
-    void recv();
-    void setTX();
-    void setRX();
-    void setSpeed(uint32_t speed);
-    void setRXTX(bool input);
-    static void handleInterrupt(HardwareTimer *timer);
-
-  public:
-    // public methods
-
-    SoftwareSerial(uint16_t receivePin, uint16_t transmitPin, bool inverse_logic=false);
-    virtual ~SoftwareSerial();
-    void begin(long speed);
-    bool listen();
-    void end();
-    bool isListening() { return active_listener == this; }
-    bool stopListening();
-    bool overflow() {
-      bool ret = _buffer_overflow;
-      if (ret) _buffer_overflow = false;
-      return ret;
-    }
-    int peek();
-
-    virtual size_t write(uint8_t byte);
-    virtual int read();
-    virtual int available();
-    virtual void flush();
-    operator bool() { return true; }
-
-    static void setInterruptPriority(uint32_t preemptPriority, uint32_t subPriority);
-
-    using Print::write;
-};
diff --git a/Marlin/src/HAL/STM32/timers.cpp b/Marlin/src/HAL/STM32/timers.cpp
index 119673144..c0ba19abe 100644
--- a/Marlin/src/HAL/STM32/timers.cpp
+++ b/Marlin/src/HAL/STM32/timers.cpp
@@ -110,7 +110,6 @@
 // ------------------------
 
 HardwareTimer *timer_instance[NUM_HARDWARE_TIMERS] = { NULL };
-bool timer_enabled[NUM_HARDWARE_TIMERS] = { false };
 
 // ------------------------
 // Public functions
@@ -135,6 +134,7 @@ void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
          * which changes the prescaler when an IRQ frequency change is needed
          * (for example when steppers are turned on)
          */
+
         timer_instance[timer_num]->setPrescaleFactor(STEPPER_TIMER_PRESCALE); //the -1 is done internally
         timer_instance[timer_num]->setOverflow(_MIN(hal_timer_t(HAL_TIMER_TYPE_MAX), (HAL_TIMER_RATE) / (STEPPER_TIMER_PRESCALE) /* /frequency */), TICK_FORMAT);
         break;
@@ -145,15 +145,13 @@ void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
         break;
     }
 
+    // Disable preload. Leaving it default-enabled can cause the timer to stop if it happens
+    // to exit the ISR after the start time for the next interrupt has already passed.
+    timer_instance[timer_num]->setPreloadEnable(false);
+
     HAL_timer_enable_interrupt(timer_num);
 
-    /*
-     * Initializes (and unfortunately starts) the timer.
-     * This is needed to set correct IRQ priority at the moment but causes
-     * no harm since every call to HAL_timer_start() is actually followed by
-     * a call to HAL_timer_enable_interrupt() which means that there isn't
-     * a case in which you want the timer to run without a callback.
-     */
+    // Start the timer.
     timer_instance[timer_num]->resume(); // First call to resume() MUST follow the attachInterrupt()
 
     // This is fixed in Arduino_Core_STM32 1.8.
@@ -161,47 +159,34 @@ void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
     // timer_instance[timer_num]->setInterruptPriority
     switch (timer_num) {
       case STEP_TIMER_NUM:
-        HAL_NVIC_SetPriority(STEP_TIMER_IRQ_NAME, STEP_TIMER_IRQ_PRIO, 0);
+        timer_instance[timer_num]->setInterruptPriority(STEP_TIMER_IRQ_PRIO, 0);
         break;
       case TEMP_TIMER_NUM:
-        HAL_NVIC_SetPriority(TEMP_TIMER_IRQ_NAME, TEMP_TIMER_IRQ_PRIO, 0);
+        timer_instance[timer_num]->setInterruptPriority(TEMP_TIMER_IRQ_PRIO, 0);
         break;
     }
   }
 }
 
 void HAL_timer_enable_interrupt(const uint8_t timer_num) {
-  if (HAL_timer_initialized(timer_num) && !timer_enabled[timer_num]) {
-    timer_enabled[timer_num] = true;
+  if (HAL_timer_initialized(timer_num) && !timer_instance[timer_num]->hasInterrupt()) {
     switch (timer_num) {
       case STEP_TIMER_NUM:
-      timer_instance[timer_num]->attachInterrupt(Step_Handler);
-      break;
-    case TEMP_TIMER_NUM:
-      timer_instance[timer_num]->attachInterrupt(Temp_Handler);
-      break;
+        timer_instance[timer_num]->attachInterrupt(Step_Handler);
+        break;
+      case TEMP_TIMER_NUM:
+        timer_instance[timer_num]->attachInterrupt(Temp_Handler);
+        break;
     }
   }
 }
 
 void HAL_timer_disable_interrupt(const uint8_t timer_num) {
-  if (HAL_timer_interrupt_enabled(timer_num)) {
-    timer_instance[timer_num]->detachInterrupt();
-    timer_enabled[timer_num] = false;
-  }
+  if (HAL_timer_initialized(timer_num)) timer_instance[timer_num]->detachInterrupt();
 }
 
 bool HAL_timer_interrupt_enabled(const uint8_t timer_num) {
-  return HAL_timer_initialized(timer_num) && timer_enabled[timer_num];
-}
-
-// Only for use within the HAL
-TIM_TypeDef * HAL_timer_device(const uint8_t timer_num) {
-  switch (timer_num) {
-    case STEP_TIMER_NUM: return STEP_TIMER_DEV;
-    case TEMP_TIMER_NUM: return TEMP_TIMER_DEV;
-  }
-  return nullptr;
+  return HAL_timer_initialized(timer_num) && timer_instance[timer_num]->hasInterrupt();
 }
 
 void SetTimerInterruptPriorities() {
@@ -209,4 +194,87 @@ void SetTimerInterruptPriorities() {
   TERN_(HAS_SERVOS, libServo::setInterruptPriority(SERVO_TIMER_IRQ_PRIO, 0));
 }
 
+// This is a terrible hack to replicate the behavior used in the framework's SoftwareSerial.cpp
+// to choose a serial timer. It will select TIM7 on most boards used by Marlin, but this is more
+// resiliant to new MCUs which may not have a TIM7. Best practice is to explicitly specify
+// TIMER_SERIAL to avoid relying on framework selections which may not be predictable.
+#if !defined(TIMER_SERIAL)
+  #if defined (TIM18_BASE)
+    #define TIMER_SERIAL TIM18
+  #elif defined (TIM7_BASE)
+    #define TIMER_SERIAL TIM7
+  #elif defined (TIM6_BASE)
+    #define TIMER_SERIAL TIM6
+  #elif defined (TIM22_BASE)
+    #define TIMER_SERIAL TIM22
+  #elif defined (TIM21_BASE)
+    #define TIMER_SERIAL TIM21
+  #elif defined (TIM17_BASE)
+    #define TIMER_SERIAL TIM17
+  #elif defined (TIM16_BASE)
+    #define TIMER_SERIAL TIM16
+  #elif defined (TIM15_BASE)
+    #define TIMER_SERIAL TIM15
+  #elif defined (TIM14_BASE)
+    #define TIMER_SERIAL TIM14
+  #elif defined (TIM13_BASE)
+    #define TIMER_SERIAL TIM13
+  #elif defined (TIM11_BASE)
+    #define TIMER_SERIAL TIM11
+  #elif defined (TIM10_BASE)
+    #define TIMER_SERIAL TIM10
+  #elif defined (TIM12_BASE)
+    #define TIMER_SERIAL TIM12
+  #elif defined (TIM19_BASE)
+    #define TIMER_SERIAL TIM19
+  #elif defined (TIM9_BASE)
+    #define TIMER_SERIAL TIM9
+  #elif defined (TIM5_BASE)
+    #define TIMER_SERIAL TIM5
+  #elif defined (TIM4_BASE)
+    #define TIMER_SERIAL TIM4
+  #elif defined (TIM3_BASE)
+    #define TIMER_SERIAL TIM3
+  #elif defined (TIM2_BASE)
+    #define TIMER_SERIAL TIM2
+  #elif defined (TIM20_BASE)
+    #define TIMER_SERIAL TIM20
+  #elif defined (TIM8_BASE)
+    #define TIMER_SERIAL TIM8
+  #elif defined (TIM1_BASE)
+    #define TIMER_SERIAL TIM1
+  #else
+    #error No suitable timer found for SoftwareSerial, define TIMER_SERIAL in variant.h
+  #endif
+#endif
+
+// Place all timers used into an array, then recursively check for duplicates during compilation.
+// This does not currently account for timers used for PWM, such as for fans.
+// Timers are actually pointers. Convert to integers to simplify constexpr logic.
+static constexpr uintptr_t timers_in_use[] = {
+  uintptr_t(TEMP_TIMER_DEV),  // Override in pins file
+  uintptr_t(STEP_TIMER_DEV),  // Override in pins file
+  #if HAS_TMC_SW_SERIAL
+    uintptr_t(TIMER_SERIAL),  // Set in variant.h, or as a define in platformio.h if not present in variant.h
+  #endif
+  #if ENABLED(SPEAKER)
+    uintptr_t(TIMER_TONE),    // Set in variant.h, or as a define in platformio.h if not present in variant.h
+  #endif
+  #if HAS_SERVOS
+    uintptr_t(TIMER_SERVO),   // Set in variant.h, or as a define in platformio.h if not present in variant.h
+  #endif
+  };
+
+static constexpr bool verify_no_duplicate_timers() {
+  LOOP_L_N(i, COUNT(timers_in_use))
+    LOOP_S_L_N(j, i + 1, COUNT(timers_in_use))
+      if (timers_in_use[i] == timers_in_use[j]) return false;
+  return true;
+}
+
+// If this assertion fails at compile time, review the timers_in_use array. If default_envs is
+// defined properly in platformio.ini, VS Code can evaluate the array when hovering over it,
+// making it easy to identify the conflicting timers.
+static_assert(verify_no_duplicate_timers(), "One or more timer conflict detected");
+
 #endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
diff --git a/Marlin/src/HAL/STM32/timers.h b/Marlin/src/HAL/STM32/timers.h
index 000f86043..5515219ea 100644
--- a/Marlin/src/HAL/STM32/timers.h
+++ b/Marlin/src/HAL/STM32/timers.h
@@ -30,8 +30,18 @@
 
 #define FORCE_INLINE __attribute__((always_inline)) inline
 
+// STM32 timers may be 16 or 32 bit. Limiting HAL_TIMER_TYPE_MAX to 16 bits
+// avoids issues with STM32F0 MCUs, which seem to pause timers if UINT32_MAX
+// is written to the register. STM32F4 timers do not manifest this issue,
+// even when writing to 16 bit timers.
+//
+// The range of the timer can be queried at runtime using IS_TIM_32B_COUNTER_INSTANCE.
+// This is a more expensive check than a simple compile-time constant, so its
+// implementation is deferred until the desire for a 32-bit range outweighs the cost
+// of adding a run-time check and HAL_TIMER_TYPE_MAX is refactored to allow unique
+// values for each timer.
 #define hal_timer_t uint32_t
-#define HAL_TIMER_TYPE_MAX 0xFFFFFFFF // Timers can be 16 or 32 bit
+#define HAL_TIMER_TYPE_MAX UINT16_MAX
 
 #ifndef STEP_TIMER_NUM
   #define STEP_TIMER_NUM        0  // Timer Index for Stepper
@@ -61,14 +71,14 @@
 #define ENABLE_TEMPERATURE_INTERRUPT() HAL_timer_enable_interrupt(TEMP_TIMER_NUM)
 #define DISABLE_TEMPERATURE_INTERRUPT() HAL_timer_disable_interrupt(TEMP_TIMER_NUM)
 
-extern void Step_Handler(HardwareTimer *htim);
-extern void Temp_Handler(HardwareTimer *htim);
+extern void Step_Handler();
+extern void Temp_Handler();
 
 #ifndef HAL_STEP_TIMER_ISR
-  #define HAL_STEP_TIMER_ISR() void Step_Handler(HardwareTimer *htim)
+  #define HAL_STEP_TIMER_ISR() void Step_Handler()
 #endif
 #ifndef HAL_TEMP_TIMER_ISR
-  #define HAL_TEMP_TIMER_ISR() void Temp_Handler(HardwareTimer *htim)
+  #define HAL_TEMP_TIMER_ISR() void Temp_Handler()
 #endif
 
 // ------------------------
@@ -90,8 +100,6 @@ bool HAL_timer_interrupt_enabled(const uint8_t timer_num);
 // Exposed here to allow all timer priority information to reside in timers.cpp
 void SetTimerInterruptPriorities();
 
-//TIM_TypeDef* HAL_timer_device(const uint8_t timer_num); no need to be public for now. not public = not used externally
-
 // FORCE_INLINE because these are used in performance-critical situations
 FORCE_INLINE bool HAL_timer_initialized(const uint8_t timer_num) {
   return timer_instance[timer_num] != NULL;
diff --git a/Marlin/src/core/boards.h b/Marlin/src/core/boards.h
index e280d955b..c8e1f2875 100644
--- a/Marlin/src/core/boards.h
+++ b/Marlin/src/core/boards.h
@@ -282,7 +282,7 @@
 
 #define BOARD_STM32F103RE             4000  // STM32F103RE Libmaple-based STM32F1 controller
 #define BOARD_MALYAN_M200             4001  // STM32C8T6  Libmaple-based STM32F1 controller
-#define BOARD_MALYAN_M200_V2          4002  // STM32F070RB  Libmaple-based STM32F0 controller
+#define BOARD_MALYAN_M200_V2          4002  // STM32F070CB  STM32F0 controller
 #define BOARD_STM3R_MINI              4003  // STM32F103RE  Libmaple-based STM32F1 controller
 #define BOARD_GTM32_PRO_VB            4004  // STM32F103VET6 controller
 #define BOARD_MORPHEUS                4005  // STM32F103C8 / STM32F103CB  Libmaple-based STM32F1 controller
diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
index 2dfb2b53b..9f120b8b0 100644
--- a/Marlin/src/pins/pins.h
+++ b/Marlin/src/pins/pins.h
@@ -480,7 +480,7 @@
 // STM32 ARM Cortex-M0
 //
 #elif MB(MALYAN_M200_V2)
-  #include "stm32f0/pins_MALYAN_M200_V2.h"      // STM32F0                                env:STM32F070RB_malyan
+  #include "stm32f0/pins_MALYAN_M200_V2.h"      // STM32F0                                env:STM32F070RB_malyan env:STM32F070CB_malyan
 #elif MB(MALYAN_M300)
   #include "stm32f0/pins_MALYAN_M300.h"         // STM32F070                              env:malyan_M300
 
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h b/Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h
index d3510b1ff..009b1b65f 100644
--- a/Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h
+++ b/Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h
@@ -21,7 +21,7 @@
  */
 #pragma once
 
-#ifndef TARGET_STM32F4
+#ifndef STM32F4
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #elif HOTENDS > 1 || E_STEPPERS > 1
   #error "BIGTREE BTT002 V1.0 supports up to 1 hotends / E-steppers."
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
index ea643322b..55d1a37aa 100644
--- a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
+++ b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
@@ -21,7 +21,7 @@
  */
 #pragma once
 
-#ifndef TARGET_STM32F4
+#ifndef STM32F4
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #elif HOTENDS > 8 || E_STEPPERS > 8
   #error "BIGTREE GTR V1.0 supports up to 8 hotends / E-steppers."
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h b/Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h
index 56c509562..9e6a43c36 100644
--- a/Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h
+++ b/Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h
@@ -21,7 +21,7 @@
  */
 #pragma once
 
-#ifndef TARGET_STM32F4
+#ifndef STM32F4
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #endif
 
diff --git a/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h b/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
index 3b513b31c..90f9e5001 100644
--- a/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
+++ b/Marlin/src/pins/stm32f4/pins_RUMBA32_common.h
@@ -42,11 +42,12 @@
 // Configure Timers
 // TIM6 is used for TONE
 // TIM7 is used for SERVO
-// TIMER_SERIAL defaults to TIM7 so we'll override it here
-//
-#define STEP_TIMER                            10
-#define TEMP_TIMER                            14
-#define TIMER_SERIAL                        TIM9
+// TIMER_SERIAL defaults to TIM7 and must be overridden in the platformio.h file if SERVO will also be used.
+//              This will be difficult to solve from the Arduino IDE, without modifying the RUMBA32 variant
+//              included with the STM32 framework.
+
+#define STEP_TIMER 10
+#define TEMP_TIMER 14
 #define HAL_TIMER_RATE                     F_CPU
 
 //
diff --git a/buildroot/share/PlatformIO/boards/LERDGE.json b/buildroot/share/PlatformIO/boards/LERDGE.json
index 21df8db48..011814a13 100644
--- a/buildroot/share/PlatformIO/boards/LERDGE.json
+++ b/buildroot/share/PlatformIO/boards/LERDGE.json
@@ -15,7 +15,8 @@
       ]
     ],
     "mcu": "stm32f407zgt6",
-    "variant": "LERDGE"
+    "variant": "LERDGE",
+    "ldscript": "LERDGE.ld"
   },
   "debug": {
     "jlink_device": "STM32F407ZG",
diff --git a/buildroot/share/PlatformIO/boards/malyanM200v2.json b/buildroot/share/PlatformIO/boards/malyanM200v2.json
index 9e301ee79..765a0c0a0 100644
--- a/buildroot/share/PlatformIO/boards/malyanM200v2.json
+++ b/buildroot/share/PlatformIO/boards/malyanM200v2.json
@@ -4,7 +4,7 @@
     "extra_flags": "-DSTM32F070xB",
     "f_cpu": "48000000L",
     "mcu": "stm32f070rbt6",
-    "variant": "MALYANM200_F070CB",
+    "variant": "MALYANMx00_F070CB",
     "vec_tab_addr": "0x8002000"
   },
   "debug": {
diff --git a/buildroot/share/PlatformIO/boards/fysetc_s6.json b/buildroot/share/PlatformIO/boards/marlin_fysetc_s6.json
similarity index 94%
rename from buildroot/share/PlatformIO/boards/fysetc_s6.json
rename to buildroot/share/PlatformIO/boards/marlin_fysetc_s6.json
index 489a15b9e..286e46ffb 100644
--- a/buildroot/share/PlatformIO/boards/fysetc_s6.json
+++ b/buildroot/share/PlatformIO/boards/marlin_fysetc_s6.json
@@ -4,7 +4,7 @@
     "extra_flags": "-DSTM32F446xx",
     "f_cpu": "180000000L",
     "mcu": "stm32f446ret6",
-    "variant": "FYSETC_S6"
+    "variant": "MARLIN_FYSETC_S6"
   },
   "connectivity": [
     "can"
@@ -32,4 +32,4 @@
   },
   "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32f446.html",
   "vendor": "FYSETC"
-}
\ No newline at end of file
+}
diff --git a/buildroot/share/PlatformIO/scripts/fysetc_STM32S6.py b/buildroot/share/PlatformIO/scripts/fysetc_STM32S6.py
deleted file mode 100644
index f6598ede6..000000000
--- a/buildroot/share/PlatformIO/scripts/fysetc_STM32S6.py
+++ /dev/null
@@ -1,33 +0,0 @@
-from os.path import join
-Import("env")
-
-import os,shutil
-from SCons.Script import DefaultEnvironment
-from platformio import util
-
-env = DefaultEnvironment()
-platform = env.PioPlatform()
-board = env.BoardConfig()
-
-FRAMEWORK_DIR = platform.get_package_dir("framework-arduinoststm32")
-#FRAMEWORK_DIR = platform.get_package_dir("framework-arduinoststm32@3.10500.190327")
-CMSIS_DIR = os.path.join(FRAMEWORK_DIR, "CMSIS", "CMSIS")
-assert os.path.isdir(FRAMEWORK_DIR)
-assert os.path.isdir(CMSIS_DIR)
-assert os.path.isdir("buildroot/share/PlatformIO/variants")
-
-mcu_type = board.get("build.mcu")[:-2]
-variant = board.get("build.variant")
-series = mcu_type[:7].upper() + "xx"
-variant_dir = os.path.join(FRAMEWORK_DIR, "variants", variant)
-
-source_dir = os.path.join("buildroot/share/PlatformIO/variants", variant)
-assert os.path.isdir(source_dir)
-
-if not os.path.isdir(variant_dir):
-    os.mkdir(variant_dir)
-
-for file_name in os.listdir(source_dir):
-    full_file_name = os.path.join(source_dir, file_name)
-    if os.path.isfile(full_file_name):
-        shutil.copy(full_file_name, variant_dir)
diff --git a/buildroot/share/PlatformIO/variants/FYSETC_S6/PeripheralPins.c b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/PeripheralPins.c
similarity index 100%
rename from buildroot/share/PlatformIO/variants/FYSETC_S6/PeripheralPins.c
rename to buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/PeripheralPins.c
diff --git a/buildroot/share/PlatformIO/variants/FYSETC_S6/PinNamesVar.h b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/PinNamesVar.h
similarity index 100%
rename from buildroot/share/PlatformIO/variants/FYSETC_S6/PinNamesVar.h
rename to buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/PinNamesVar.h
diff --git a/buildroot/share/PlatformIO/variants/FYSETC_S6/ldscript.ld b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/ldscript.ld
similarity index 100%
rename from buildroot/share/PlatformIO/variants/FYSETC_S6/ldscript.ld
rename to buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/ldscript.ld
diff --git a/buildroot/share/PlatformIO/variants/FYSETC_S6/variant.cpp b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/variant.cpp
similarity index 100%
rename from buildroot/share/PlatformIO/variants/FYSETC_S6/variant.cpp
rename to buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/variant.cpp
diff --git a/buildroot/share/PlatformIO/variants/FYSETC_S6/variant.h b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/variant.h
similarity index 99%
rename from buildroot/share/PlatformIO/variants/FYSETC_S6/variant.h
rename to buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/variant.h
index da6a8249e..ee4b1ef29 100644
--- a/buildroot/share/PlatformIO/variants/FYSETC_S6/variant.h
+++ b/buildroot/share/PlatformIO/variants/MARLIN_FYSETC_S6/variant.h
@@ -115,7 +115,7 @@ extern "C" {
 #define NUM_ANALOG_FIRST        80
 
 // PWM resolution
-#define PWM_RESOLUTION          12
+// #define PWM_RESOLUTION          12
 #define PWM_FREQUENCY           20000 // >= 20 Khz => inaudible noise for fans
 #define PWM_MAX_DUTY_CYCLE      255
 
diff --git a/buildroot/tests/STM32F070CB_malyan-tests b/buildroot/tests/STM32F070CB_malyan-tests
new file mode 100644
index 000000000..20bd111fa
--- /dev/null
+++ b/buildroot/tests/STM32F070CB_malyan-tests
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+#
+# Build tests for STM32F070CB Malyan M200 v2
+#
+
+# exit on first failure
+set -e
+
+restore_configs
+opt_set MOTHERBOARD BOARD_MALYAN_M200_V2
+opt_set SERIAL_PORT -1
+exec_test $1 $2 "Malyan M200 v2 Default Config"
+
+# cleanup
+restore_configs
diff --git a/platformio.ini b/platformio.ini
index e3ff6c152..f46e60996 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -661,13 +661,10 @@ board     = nxp_lpc1769
 # HAL/STM32 Base Environment values
 #
 [common_stm32]
-platform      = ststm32@~6.1.0
-platform_packages = framework-arduinoststm32@>=4.10700,<4.10800
-lib_ignore    = SoftwareSerial
+platform      = ststm32@~8.0
 build_flags   = ${common.build_flags}
-  -IMarlin/src/HAL/STM32 -std=gnu++14
+  -std=gnu++14
   -DUSBCON -DUSBD_USE_CDC
-  -DUSBD_VID=0x0483
   -DTIM_IRQ_PRIO=13
 build_unflags = -std=gnu++11
 src_filter    = ${common.default_src_filter} +<src/HAL/STM32>
@@ -676,7 +673,7 @@ src_filter    = ${common.default_src_filter} +<src/HAL/STM32>
 # HAL/STM32F1 Common Environment values
 #
 [common_stm32f1]
-platform      = ${common_stm32.platform}
+platform      = ststm32@~6.1
 build_flags   = !python Marlin/src/HAL/STM32F1/build_flags.py
   ${common.build_flags} -std=gnu++14 -DHAVE_SW_SERIAL
 build_unflags = -std=gnu11 -std=gnu++11
@@ -828,7 +825,6 @@ platform      = ${common_stm32.platform}
 extends       = common_stm32
 board         = armed_v1
 build_flags   = ${common_stm32.build_flags}
-  '-DUSB_PRODUCT="ARMED_V1"'
   -O2 -ffreestanding -fsigned-char -fno-move-loop-invariants -fno-strict-aliasing
 
 #
@@ -1008,20 +1004,29 @@ lib_ignore    = ${common_stm32f1.lib_ignore}
 platform    = ${common_stm32.platform}
 extends     = common_stm32
 board       = malyanM200v2
-build_flags = ${common_stm32.build_flags} -DSTM32F0xx -DUSB_PRODUCT=\"STM32F070RB\" -DHAL_PCD_MODULE_ENABLED
-  -O2 -ffreestanding -fsigned-char -fno-move-loop-invariants -fno-strict-aliasing -std=gnu11 -std=gnu++11
+build_flags = ${common_stm32.build_flags} -DHAL_PCD_MODULE_ENABLED
+  -O2 -ffreestanding -fsigned-char -fno-move-loop-invariants -fno-strict-aliasing
   -DCUSTOM_STARTUP_FILE
-lib_ignore  = SoftwareSerial
+
+#
+# Malyan M200 v2 (STM32F070CB)
+#
+[env:STM32F070CB_malyan]
+platform    = ${common_stm32.platform}
+extends     = common_stm32
+board       = malyanm200_f070cb
+build_flags = ${common_stm32.build_flags}
+  -DHAL_PCD_MODULE_ENABLED -DDISABLE_GENERIC_SERIALUSB -DHAL_UART_MODULE_ENABLED -DCUSTOM_STARTUP_FILE
 
 #
 # Malyan M300 (STM32F070CB)
 #
 [env:malyan_M300]
-platform    = ststm32@>=6.1.0,<6.2.0
+platform    = ${common_stm32.platform}
+extends     = common_stm32
 board       = malyanm300_f070cb
-build_flags = ${common.build_flags}
-  -DUSBCON -DUSBD_VID=0x0483 "-DUSB_MANUFACTURER=\"Unknown\"" "-DUSB_PRODUCT=\"MALYAN_M300\""
-  -DHAL_PCD_MODULE_ENABLED -DUSBD_USE_CDC -DDISABLE_GENERIC_SERIALUSB -DHAL_UART_MODULE_ENABLED
+build_flags = ${common_stm32.build_flags}
+  -DHAL_PCD_MODULE_ENABLED -DDISABLE_GENERIC_SERIALUSB -DHAL_UART_MODULE_ENABLED
 src_filter  = ${common.default_src_filter} +<src/HAL/STM32>
 
 #
@@ -1074,13 +1079,11 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = STEVAL_STM32F401VE
 build_flags       = ${common_stm32.build_flags}
-  -DTARGET_STM32F4 -DARDUINO_STEVAL -DSTM32F401xE
-  -DUSB_PRODUCT=\"STEVAL_F401VE\"
+  -DARDUINO_STEVAL -DSTM32F401xE
   -DDISABLE_GENERIC_SERIALUSB -DUSBD_USE_CDC_COMPOSITE -DUSE_USB_FS
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
   buildroot/share/PlatformIO/scripts/STEVAL__F401XX.py
-lib_ignore        = SoftwareSerial
 
 #
 # FLYF407ZG
@@ -1090,8 +1093,7 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = FLYF407ZG
 build_flags       = ${common_stm32.build_flags}
-  -DSTM32F4 -DUSB_PRODUCT=\"STM32F407ZG\"
-  -DTARGET_STM32F4 -DVECT_TAB_OFFSET=0x8000
+  -DVECT_TAB_OFFSET=0x8000
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 
@@ -1101,14 +1103,13 @@ extra_scripts     = ${common.extra_scripts}
 [env:FYSETC_S6]
 platform          = ${common_stm32.platform}
 extends           = common_stm32
-platform_packages = ${common_stm32.platform_packages}
-   tool-stm32duino
-board             = fysetc_s6
+platform_packages = tool-stm32duino
+board             = marlin_fysetc_s6
 build_flags       = ${common_stm32.build_flags}
-  -DTARGET_STM32F4 -DVECT_TAB_OFFSET=0x10000
-  -DHAL_PCD_MODULE_ENABLED '-DUSB_PRODUCT="FYSETC_S6"'
+  -DVECT_TAB_OFFSET=0x10000
+  -DHAL_PCD_MODULE_ENABLED
 extra_scripts     = ${common.extra_scripts}
-  pre:buildroot/share/PlatformIO/scripts/fysetc_STM32S6.py
+  pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 debug_tool        = stlink
 upload_protocol   = dfu
 upload_command    = dfu-util -a 0 -s 0x08010000:leave -D "$SOURCE"
@@ -1123,12 +1124,10 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = blackSTM32F407VET6
 build_flags       = ${common_stm32.build_flags}
-  -DTARGET_STM32F4 -DARDUINO_BLACK_F407VE
-  -DUSB_PRODUCT=\"BLACK_F407VE\"
+  -DARDUINO_BLACK_F407VE
   -DUSBD_USE_CDC_COMPOSITE -DUSE_USB_FS
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
-lib_ignore        = SoftwareSerial
 
 #
 # BigTreeTech SKR Pro (STM32F407ZGT6 ARM Cortex-M4)
@@ -1138,8 +1137,7 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = BigTree_SKR_Pro
 build_flags       = ${common_stm32.build_flags}
-  -DUSB_PRODUCT=\"STM32F407ZG\"
-  -DTARGET_STM32F4 -DSTM32F407_5ZX -DVECT_TAB_OFFSET=0x8000
+  -DSTM32F407_5ZX -DVECT_TAB_OFFSET=0x8000
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 #upload_protocol   = stlink
@@ -1151,14 +1149,13 @@ debug_init_break  =
 # Bigtreetech GTR V1.0 (STM32F407IGT6 ARM Cortex-M4)
 #
 [env:BIGTREE_GTR_V1_0]
-platform          = ststm32@>=5.7.0,<6.2.0
+platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = BigTree_GTR_v1
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 build_flags       = ${common_stm32.build_flags}
-  -DUSB_PRODUCT=\"STM32F407IG\"
-  -DTARGET_STM32F4 -DSTM32F407IX -DVECT_TAB_OFFSET=0x8000
+  -DSTM32F407IX -DVECT_TAB_OFFSET=0x8000
 
 #
 # BigTreeTech BTT002 V1.0 (STM32F407VGT6 ARM Cortex-M4)
@@ -1168,8 +1165,7 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 board             = BigTree_Btt002
 build_flags       = ${common_stm32.build_flags}
-  -DUSB_PRODUCT=\"STM32F407VG\"
-  -DTARGET_STM32F4 -DSTM32F407_5VX -DVECT_TAB_OFFSET=0x8000
+  -DSTM32F407_5VX -DVECT_TAB_OFFSET=0x8000
   -DHAVE_HWSERIAL2
   -DHAVE_HWSERIAL3
   -DPIN_SERIAL2_RX=PD_6
@@ -1226,10 +1222,10 @@ platform      = ${common_stm32.platform}
 extends       = common_stm32
 build_flags   = ${common_stm32.build_flags}
   -Os
-  "-DUSB_PRODUCT=\"RUMBA32\""
   -DHAL_PCD_MODULE_ENABLED
   -DDISABLE_GENERIC_SERIALUSB
   -DHAL_UART_MODULE_ENABLED
+  -DTIMER_SERIAL=TIM9
 board         = rumba32_f446ve
 upload_protocol = dfu
 monitor_speed = 500000