DM: updated magic number to match circuitpython stuff

Author: deanm1278

bootloaders/metroM4/METRO_M4_sam_ba.bin

@@ -35,8 +35,8 @@
  * BOOT_DOUBLE_TAP_ADDRESS must point to a free SRAM cell that must not
  * be touched from the loaded application.
  */
-#define BOOT_DOUBLE_TAP_ADDRESS           (0x2002FFFCul)
-#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *) BOOT_DOUBLE_TAP_ADDRESS))
+#define BOOT_DOUBLE_TAP_ADDRESS           (HSRAM_ADDR + HSRAM_SIZE - 4)
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)BOOT_DOUBLE_TAP_ADDRESS))
 
 /*
  * If BOOT_LOAD_PIN is defined the bootloader is started if the selected

bootloaders/metroM4/METRO_M4_sam_ba.elf

@@ -35,8 +35,8 @@
  * BOOT_DOUBLE_TAP_ADDRESS must point to a free SRAM cell that must not
  * be touched from the loaded application.
  */
-#define BOOT_DOUBLE_TAP_ADDRESS           (0x2002FFFCul)
-#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *) BOOT_DOUBLE_TAP_ADDRESS))
+#define BOOT_DOUBLE_TAP_ADDRESS           (HSRAM_ADDR + HSRAM_SIZE - 4)
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)BOOT_DOUBLE_TAP_ADDRESS))
 
 /*
  * If BOOT_LOAD_PIN is defined the bootloader is started if the selected

bootloaders/metroM4/METRO_M4_sam_ba.hex

@@ -78,7 +78,7 @@ uint32_t* pulSketch_Start_Address;
   }
 
 #if defined(BOOT_DOUBLE_TAP_ADDRESS)
-  #define DOUBLE_TAP_MAGIC 0x07738135
+  #define DOUBLE_TAP_MAGIC 0xf01669efUL
   //if (PM->RCAUSE.bit.POR)
   if( RSTC->RCAUSE.bit.POR )
   {

bootloaders/metroM4/board_definitions_feather_m4.h

@@ -55,8 +55,8 @@ static void banzai() {
 
 #if defined(__SAMD51__)
 	//THESE MUST MATCH THE BOOTLOADER
-	#define DOUBLE_TAP_MAGIC 			0x07738135
-	#define BOOT_DOUBLE_TAP_ADDRESS     0x2002FFFCul
+	#define DOUBLE_TAP_MAGIC 			0xf01669efUL
+	#define BOOT_DOUBLE_TAP_ADDRESS     (HSRAM_ADDR + HSRAM_SIZE - 4)
 
 	unsigned long *a = (unsigned long *)BOOT_DOUBLE_TAP_ADDRESS;
 	*a = DOUBLE_TAP_MAGIC;