Using RAM_D3 start as flag for system_bootloader

STM32H723VGTX_RAM.ld

@@ -43,8 +43,9 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-  RAM_EXEC (xrw)  : ORIGIN = 0x24000000, LENGTH = 320K
-  DTCMRAM  (xrw)  : ORIGIN = 0x20000000, LENGTH = 128K
+  RAM_EXEC (xrw)  : ORIGIN = 0x24000000, LENGTH = 319K
+  RAM_NOINIT(xrw) : ORIGIN = 0x2404fc00, LENGTH = 1K
+  DTCMRAM  (xrw)  : ORIGIN = 0x20000000, LENGTH = 127K
   ITCMRAM (xrw)   : ORIGIN = 0x00000000, LENGTH = 64K
   RAM_D2  (xrw)   : ORIGIN = 0x30000000, LENGTH = 32K
   RAM_D3  (xrw)   : ORIGIN = 0x38000000, LENGTH = 16K
@@ -161,6 +162,12 @@ SECTIONS
     . = ALIGN(8);
   } >DTCMRAM
 
+
+    .noinit :
+  {
+    KEEP(*(.noinitdata))
+  } >DTCMRAM2
+
   /* Remove information from the standard libraries */
   /DISCARD/ :
   {