🔨 FYSETC S6 small bootloader target (#22207)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/pins/pins.h

@@ -610,11 +610,11 @@
 #elif MB(VAKE403D)
   #include "stm32f4/pins_VAKE403D.h"            // STM32F4
 #elif MB(FYSETC_S6)
-  #include "stm32f4/pins_FYSETC_S6.h"           // STM32F4                                env:FYSETC_S6
+  #include "stm32f4/pins_FYSETC_S6.h"           // STM32F4                                env:FYSETC_S6 env:FYSETC_S6_8000
 #elif MB(FYSETC_S6_V2_0)
-  #include "stm32f4/pins_FYSETC_S6_V2_0.h"      // STM32F4                                env:FYSETC_S6
+  #include "stm32f4/pins_FYSETC_S6_V2_0.h"      // STM32F4                                env:FYSETC_S6 env:FYSETC_S6_8000
 #elif MB(FYSETC_SPIDER)
-  #include "stm32f4/pins_FYSETC_SPIDER.h"       // STM32F4                                env:FYSETC_S6
+  #include "stm32f4/pins_FYSETC_SPIDER.h"       // STM32F4                                env:FYSETC_S6 env:FYSETC_S6_8000
 #elif MB(FLYF407ZG)
   #include "stm32f4/pins_FLYF407ZG.h"           // STM32F4                                env:FLYF407ZG
 #elif MB(MKS_ROBIN2)

Marlin/src/pins/stm32f4/pins_FYSETC_S6.h

@@ -56,7 +56,9 @@
 //
 // Servos
 //
-#define SERVO0_PIN                          PA3
+#ifndef SERVO0_PIN
+  #define SERVO0_PIN                        PA3
+#endif
 
 //
 // Limit Switches

Marlin/src/pins/stm32f4/pins_FYSETC_SPIDER.h

@@ -68,6 +68,12 @@
 //
 #define X_ENABLE_PIN                        PE9
 
+//
+// Servos
+// Z_MAX_PIN only works in input mode
+//
+#define SERVO0_PIN                          PA2
+
 #if HAS_TMC_UART
   #define X_SERIAL_TX_PIN                   PE7
   #define X_SERIAL_RX_PIN                   PE7

buildroot/share/PlatformIO/boards/marlin_fysetc_s6.json

@@ -21,7 +21,7 @@
   "name": "3D Printer control board",
   "upload": {
     "maximum_ram_size": 131072,
-    "maximum_size": 524288,
+    "maximum_size": 458752,
     "protocol": "stlink",
     "protocols": [
       "jlink",

buildroot/share/PlatformIO/boards/marlin_fysetc_s6_8000.json

@@ -0,0 +1,35 @@
+{
+  "build": {
+    "cpu": "cortex-m4",
+    "extra_flags": "-DSTM32F446xx",
+    "f_cpu": "180000000L",
+    "mcu": "stm32f446ret6",
+    "variant": "MARLIN_FYSETC_S6"
+  },
+  "connectivity": [
+    "can"
+  ],
+  "debug": {
+    "jlink_device": "STM32F446RE",
+    "openocd_target": "stm32f4x",
+    "svd_path": "STM32F446x.svd"
+  },
+  "frameworks": [
+    "arduino",
+    "stm32cube"
+  ],
+  "name": "3D Printer control board",
+  "upload": {
+    "maximum_ram_size": 131072,
+    "maximum_size": 491520,
+    "protocol": "stlink",
+    "protocols": [
+      "jlink",
+      "stlink",
+      "blackmagic",
+      "serial"
+    ]
+  },
+  "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32f446.html",
+  "vendor": "FYSETC"
+}

ini/stm32f4.ini

@@ -76,9 +76,7 @@ platform          = ${common_stm32.platform}
 extends           = common_stm32
 platform_packages = tool-stm32duino
 board             = marlin_fysetc_s6
-build_flags       = ${common_stm32.build_flags}
-  -DVECT_TAB_OFFSET=0x10000
-  -DHAL_PCD_MODULE_ENABLED
+build_flags       = ${common_stm32.build_flags} -DVECT_TAB_OFFSET=0x10000 -DHAL_PCD_MODULE_ENABLED
 extra_scripts     = ${common.extra_scripts}
   pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 debug_tool        = stlink
@@ -86,6 +84,21 @@ upload_protocol   = dfu
 upload_command    = dfu-util -a 0 -s 0x08010000:leave -D "$SOURCE"
 
 #
+# FYSETC S6 new bootloader
+#
+[env:FYSETC_S6_8000]
+platform                    = ${common_stm32.platform}
+extends                     = env:FYSETC_S6
+board                       = marlin_fysetc_s6_8000
+board_build.offset          = 0x8000
+board_upload.offset_address = 0x08008000
+build_flags                 = ${common_stm32.build_flags} -DHAL_PCD_MODULE_ENABLED
+extra_scripts               = ${common.extra_scripts}
+  pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
+  buildroot/share/PlatformIO/scripts/stm32_bootloader.py
+upload_command              = dfu-util -a 0 -s 0x08008000:leave -D "$SOURCE"
+
+#
 # STM32F407VET6 with RAMPS-like shield
 # 'Black' STM32F407VET6 board - https://wiki.stm32duino.com/index.php?title=STM32F407
 # Shield - https://github.com/jmz52/Hardware