diff --git a/BaS_gcc/Makefile b/BaS_gcc/Makefile
index ac0c945..77af505 100644
--- a/BaS_gcc/Makefile
+++ b/BaS_gcc/Makefile
@@ -9,7 +9,7 @@
 
 # can be either "Y" or "N" (without quotes). "Y" for using the m68k-elf-, "N" for using the m68k-atari-mint
 # toolchain
-COMPILE_ELF=N
+COMPILE_ELF=Y
 
 ifeq (Y,$(COMPILE_ELF))
 TCPREFIX=m68k-elf-
diff --git a/BaS_gcc/include/mmu.h b/BaS_gcc/include/mmu.h
index 75561c7..9cf962c 100644
--- a/BaS_gcc/include/mmu.h
+++ b/BaS_gcc/include/mmu.h
@@ -56,11 +56,22 @@
 
 #define SCA_PAGE_ID		6	/* indicates video memory page */
 
+/*
+ * MMU page sizes
+ */
 #define MMU_PAGE_SIZE_1M	0
 #define MMU_PAGE_SIZE_4K	1
 #define MMU_PAGE_SIZE_8K	2
 #define MMU_PAGE_SIZE_1K	3
 
+/*
+ * MMU cache modes
+ */
+#define MMU_CACHE_WRITETHROUGH		0
+#define MMU_CACHE_COPYBACK			1
+#define MMU_CACHE_NOCACHE_PRECISE	2
+#define MMU_CACHE_NOCACHE_IMPRECISE	3
+
 /*
  * global variables from linker script
  */
diff --git a/BaS_gcc/sys/mmu.c b/BaS_gcc/sys/mmu.c
index 3d8707e..a402459 100644
--- a/BaS_gcc/sys/mmu.c
+++ b/BaS_gcc/sys/mmu.c
@@ -337,6 +337,49 @@ void mmu_init(void)
 }
 
 
+/*
+ * TODO: this would be nicer in an include file
+ */
+extern uint8_t _MBAR[];
+extern uint8_t _RAMBAR0[];
+extern uint8_t _RAMBAR1[];
+extern uint8_t _SYS_SRAM[];
+extern uint8_t _SYS_SRAM_SIZE[];
+
+static struct mmu_mapping
+{
+	uint32_t phys;
+	uint32_t virt;
+	uint32_t length;
+	uint32_t pagesize;
+	uint32_t flags;
+} memory_map[] =
+{
+	{
+		_RAMBAR0,
+		_RAMBAR0,
+		_RAMBAR0_SIZE,
+		MMU_PAGE_SIZE_1K,
+		MMU_CACHE_WRITETHROUGH,
+	},
+	{
+		_RAMBAR1,
+		_RAMBAR1,
+		_RAMBAR1_SIZE,
+		MMU_PAGE_SIZE_1K,
+		MMU_CACHE_WRITETHROUGH,
+	},
+	{
+		_SYS_SRAM,
+		_SYS_SRAM,
+		_SYS_SRAM_SIZE,
+		MMU_PAGE_SIZE_1K,
+		MMU_CACHE_WRITETHROUGH,
+	}
+};
+
+static int num_mmu_maps = sizeof(memory_map) / sizeof(struct mmu_mapping);
+
 /*
  * handle an access error 
  * upper level routine called from access_exception inside exceptions.S
@@ -383,11 +426,6 @@ bool access_exception(uint32_t pc, uint32_t format_status)
 		}
 		else
 		{
-			extern uint8_t _RAMBAR0[];
-			extern uint8_t _RAMBAR1[];
-			extern uint8_t _SYS_SRAM[];
-			extern uint8_t _SYS_SRAM_SIZE[];
-
 			uint32_t flags;
 
 			/* TODO: MBAR, MMUBAR, PCI MEMORY, PCI IO, DMA BUFFERS */