only copy the data section if code resides in flash

diff --git a/betty/startup.s b/betty/startup.s
index d6b0184..dc43ab6 100644 (file)
--- a/betty/startup.s
+++ b/betty/startup.s
@@ -102,12 +102,15 @@ handle_reset:
        ldr r0, =stack_limit
        mov sl, r0
 
-       # copy data section
+       # copy data section (only if we are in flash <=> _etext = _data)
 
        ldr r1, =_etext
        ldr r2, =_data
        ldr r3, =_edata
 
+       cmp r1, r2
+       beq start_of_c_code
+
 copy_data_loop:
 
        cmp r2, r3
@@ -117,6 +120,8 @@ copy_data_loop:
 
        # jump to c code
 
+start_of_c_code:
+
        adr lr, loop_forever
        mov r0, #0
        mov r1, #0