From: hackbard <hackbard@sage.physik.uni-augsburg.de>
Date: Mon, 17 Sep 2007 14:05:58 +0000 (+0200)
Subject: only copy the data section if code resides in flash
X-Git-Url: https://hackdaworld.org/gitweb/?a=commitdiff_plain;h=c0321fdefb210dfc4cf43959e76c3c7c49f9e490;p=my-code%2Farm.git

only copy the data section if code resides in flash
---

diff --git a/betty/startup.s b/betty/startup.s
index d6b0184..dc43ab6 100644
--- 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