diff --git a/bootloader/flash.ld b/bootloader/flash.ld
index 80bf4a2..8ce0539 100644
--- a/bootloader/flash.ld
+++ b/bootloader/flash.ld
@@ -1,15 +1,16 @@
 ENTRY(Reset_Handler)
 
+StackSize = 0x4000; /* 16KB */
+
 MEMORY
 {
     /*FLASH (rx) :ORIGIN = 0x08000000, LENGTH = 128K*/
     /*ITCM (xrw) :ORIGIN = 0x00000000, LENGTH = 64K*/
     FLASH (xr) :ORIGIN = 0x00000000, LENGTH = 64K
-    DTCM (xrw) :ORIGIN = 0x20000000, LENGTH = 112K
-    STACK (rw) :ORIGIN = 0x2001C000, LENGTH = 16K
+    DTCM (xrw) :ORIGIN = 0x20000000, LENGTH = 128K - StackSize
 }
 
-_stack_top = ORIGIN(STACK) + LENGTH(STACK);
+_stack_top = ORIGIN(DTCM) + LENGTH(DTCM) + StackSize;
 
 SECTIONS
 {