diff --git a/ports/atmel-samd/boards/samd21x18-bootloader-crystalless.ld b/ports/atmel-samd/boards/samd21x18-bootloader-crystalless.ld
index 3b3c58ad2..2adf4fa90 100644
--- a/ports/atmel-samd/boards/samd21x18-bootloader-crystalless.ld
+++ b/ports/atmel-samd/boards/samd21x18-bootloader-crystalless.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd21x18-bootloader-external-flash-crystalless.ld b/ports/atmel-samd/boards/samd21x18-bootloader-external-flash-crystalless.ld
index 7d86dea1f..bddaae99d 100644
--- a/ports/atmel-samd/boards/samd21x18-bootloader-external-flash-crystalless.ld
+++ b/ports/atmel-samd/boards/samd21x18-bootloader-external-flash-crystalless.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd21x18-bootloader-external-flash.ld b/ports/atmel-samd/boards/samd21x18-bootloader-external-flash.ld
index 66bceee00..4e677a079 100644
--- a/ports/atmel-samd/boards/samd21x18-bootloader-external-flash.ld
+++ b/ports/atmel-samd/boards/samd21x18-bootloader-external-flash.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd21x18-bootloader.ld b/ports/atmel-samd/boards/samd21x18-bootloader.ld
index 7e33ed007..3eb97ee02 100644
--- a/ports/atmel-samd/boards/samd21x18-bootloader.ld
+++ b/ports/atmel-samd/boards/samd21x18-bootloader.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd51x18-bootloader-external-flash.ld b/ports/atmel-samd/boards/samd51x18-bootloader-external-flash.ld
index 0fc476889..0bd2a8297 100644
--- a/ports/atmel-samd/boards/samd51x18-bootloader-external-flash.ld
+++ b/ports/atmel-samd/boards/samd51x18-bootloader-external-flash.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd51x19-bootloader-external-flash.ld b/ports/atmel-samd/boards/samd51x19-bootloader-external-flash.ld
index cd65e965d..b6b4f3265 100644
--- a/ports/atmel-samd/boards/samd51x19-bootloader-external-flash.ld
+++ b/ports/atmel-samd/boards/samd51x19-bootloader-external-flash.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd51x19-bootloader.ld b/ports/atmel-samd/boards/samd51x19-bootloader.ld
index 54e16a8f5..4876e8227 100644
--- a/ports/atmel-samd/boards/samd51x19-bootloader.ld
+++ b/ports/atmel-samd/boards/samd51x19-bootloader.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd51x20-bootloader-external-flash.ld b/ports/atmel-samd/boards/samd51x20-bootloader-external-flash.ld
index 148f4dd9f..3a1611279 100644
--- a/ports/atmel-samd/boards/samd51x20-bootloader-external-flash.ld
+++ b/ports/atmel-samd/boards/samd51x20-bootloader-external-flash.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS
diff --git a/ports/atmel-samd/boards/samd51x20-bootloader.ld b/ports/atmel-samd/boards/samd51x20-bootloader.ld
index c8a43e724..d3d37de3b 100644
--- a/ports/atmel-samd/boards/samd51x20-bootloader.ld
+++ b/ports/atmel-samd/boards/samd51x20-bootloader.ld
@@ -13,7 +13,7 @@ MEMORY
 /* top end of the stack */
 /* stack must be double-word (8 byte) aligned */
 _estack = ORIGIN(RAM) + LENGTH(RAM) - 8;
-_bootloader_dbl_tap = _estack;
+_bootloader_dbl_tap = ORIGIN(RAM) + LENGTH(RAM) - 4;
 
 /* define output sections */
 SECTIONS