it builds!

.gitignore

@@ -0,0 +1,2 @@
+*.axf
+*.map

Makefile

@@ -0,0 +1,19 @@
+CC=arm-none-eabi-gcc
+ARCH_FLAGS=-mthumb -mcpu=cortex-m0plus
+CFLAGS=$(ARCH_FLAGS) -Os -flto -ffunction-sections -fdata-sections -D__STARTUP_COPY_MULTIPLE -D__STARTUP_CLEAR_BSS_MULTIPLE
+USE_NANO=--specs=nano.specs
+USE_NOHOST=--specs=nosys.specs
+
+# Link for code size
+GC=-Wl,--gc-sections
+
+# Create map file
+MAP=-Wl,-Map=main.map
+
+LDSCRIPTS=-L. -T multi-ram.ld
+
+main.axf: main.c sysinit.c startup_ARMCM0.s
+	$(CC) $^ $(CFLAGS) -fno-exceptions $(USE_NANO) $(USE_NOHOST) $(LDSCRIPTS) $(GC) $(MAP) -o $@
+
+clean:
+	rm -f *.axf *.map

main.c

@@ -0,0 +1,7 @@
+
+void main()
+{
+  for (;;);
+
+  return;
+}

multi-ram.ld

@@ -184,6 +184,7 @@ SECTIONS
 		__bss2_end__ = .;
 	} > RAM2
 	
+	/*
 	.heap (COPY):
 	{
 		__end__ = .;
@@ -191,6 +192,7 @@ SECTIONS
 		*(.heap*)
 		__HeapLimit = .;
 	} > RAM
+	*/
 
 	/* .stack_dummy section doesn't contains any symbols. It is only
 	 * used for linker to calculate size of stack sections, and assign
@@ -202,7 +204,7 @@ SECTIONS
 
 	/* Set stack top to end of RAM, and stack limit move down by
 	 * size of stack_dummy section */
-	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackTop = ORIGIN(RAM) + 0xFF;
 	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
 	PROVIDE(__stack = __StackTop);
 	

startup_ARMCM0.s

@@ -30,11 +30,6 @@
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
    ---------------------------------------------------------------------------*/
-
-/* CHANGING DEFINES */
-#define __STARTUP_COPY_MULTIPLE
-#define __STARTUP_CLEAR_BSS_MULTIPLE
-
 	.syntax	unified
 	.arch	armv6-m
 
@@ -237,7 +232,7 @@ Reset_Handler:
 #ifndef __START
 #define __START _start
 #endif
-	bl	__START
+	bl	_start
 
 	.pool
 	.size	Reset_Handler, . - Reset_Handler