diff --git a/bsp/fm3/board.h b/bsp/fm3/board.h
index 95fb18e416b4ae10ea198537621bce4c23c75f3b..251b4b31f26c16ee3f521b646c777388c31cf85b 100644
--- a/bsp/fm3/board.h
+++ b/bsp/fm3/board.h
@@ -34,7 +34,7 @@
 //MB9BF505 : 48
 //MB9BF506 : 64
 #define FM3_SRAM_SIZE         32
-#define FM3_SRAM_END          (0x20000000 + FM3_SRAM_SIZE * 1024)
+#define FM3_SRAM_END          (0x1FFFC000 + FM3_SRAM_SIZE * 1024)
 
 void rt_hw_led_on(int n);
 void rt_hw_led_off(int n);
diff --git a/bsp/fm3/mb9bf500r.icf b/bsp/fm3/mb9bf500r.icf
index 5abdf95d14f1160e86afc686cf817b7385b0bb5f..ff723823ce6e9b9cf4385e6b241ad9ee1954b415 100644
--- a/bsp/fm3/mb9bf500r.icf
+++ b/bsp/fm3/mb9bf500r.icf
@@ -6,11 +6,11 @@ define symbol __ICFEDIT_intvec_start__ = 0x00000000;
 /*-Memory Regions-*/
 define symbol __ICFEDIT_region_ROM_start__   = 0x00000000;
 define symbol __ICFEDIT_region_ROM_end__     = 0x0003FFFF;
-define symbol __ICFEDIT_region_RAM_start__   = 0x20000000;
+define symbol __ICFEDIT_region_RAM_start__   = 0x1FFFC000;
 define symbol __ICFEDIT_region_RAM_end__     = 0x20007FFF;
 /*-Sizes-*/
 define symbol __ICFEDIT_size_cstack__   = 0x800;
-define symbol __ICFEDIT_size_heap__     = 0x400;
+define symbol __ICFEDIT_size_heap__     = 0x0;
 /**** End of ICF editor section. ###ICF###*/