From 92f9544d8c2d673322a6e0be487cf8952c95c99b Mon Sep 17 00:00:00 2001
From: marcan <marcan@marcansoft.com>
Date: Thu, 26 Mar 2009 05:15:05 +0100
Subject: [PATCH] Clear stack to 0xDEADBEEF for debugging

---
 start.S | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/start.S b/start.S
index 388cdb7..91a47ad 100644
--- a/start.S
+++ b/start.S
@@ -44,10 +44,24 @@ v_reset:
 	@ Output 0x42 to the debug port
 	mov	r0, #0x42
 	bl	debug_output
-	
+
 	@ Set up a stack
 	ldr	sp, =__stack_addr
 
+	@ clear the stack to a marker value
+	ldr	r1, =__stack_end
+	ldr	r2, =__stack_addr
+	ldr	r3, =0xDEADBEEF
+stk_loop:
+	@ check for the end
+	cmp	r1, r2
+	beq	done_stk
+	@ clear the word and move on
+	str	r3, [r1]
+	add	r1, r1, #4
+	b	stk_loop
+
+done_stk:
 	@ clear BSS
 	ldr	r1, =__bss_start
 	ldr	r2, =__bss_end