Fixed missing NOLOAD directive in STM32F405 linker scripts causing the linker to emit initialisation data for the BSS section at address 0x2000 0000 and, consequently, making the flasher to wipe up the settings region in MCU's internal flash.

platform/mcu/STM32F4xx/linker_script_MDx.ld

@@ -175,7 +175,9 @@ SECTIONS
     } > smallram
     _bss_end = .;
 
-    .bss2 :
+    /* Second BSS section located in the "large" RAM, explicitly request to not
+       initialize it */
+    .bss2 (NOLOAD) :
     {
         *(.bss2)
         . = ALIGN(8);

platform/mcu/STM32F4xx/linker_script_Mod17.ld

@@ -174,7 +174,9 @@ SECTIONS
     } > smallram
     _bss_end = .;
 
-    .bss2 :
+    /* Second BSS section located in the "large" RAM, explicitly request to not
+       initialize it */
+    .bss2 (NOLOAD) :
     {
         *(.bss2)
         . = ALIGN(8);