From 5924485defc0bf00f3beba76246d2be5cf588d81 Mon Sep 17 00:00:00 2001
From: Kelvin Lawson <kelvinl@users.sf.net>
Date: Tue, 17 Sep 2013 17:06:06 +0100
Subject: [PATCH] dm36x: Copy vector table from initial 0x80000000 to required
 location on ARM, 0x00000000.

---
 ports/arm/platforms/dm36x/atomport-private.c | 10 +++++++---
 ports/arm/platforms/dm36x/system.ld          |  2 ++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/ports/arm/platforms/dm36x/atomport-private.c b/ports/arm/platforms/dm36x/atomport-private.c
index 5cd1758..7986240 100644
--- a/ports/arm/platforms/dm36x/atomport-private.c
+++ b/ports/arm/platforms/dm36x/atomport-private.c
@@ -37,7 +37,7 @@
  
 
 /** Imports required by C startup code */
-extern unsigned long _end_text, _start_data, _end_data, _start_bss, _end_bss;
+extern unsigned long _start_vectors, _end_vectors, _end_text, _start_data, _end_data, _start_bss, _end_bss;
 extern int main(void);
 
 
@@ -61,9 +61,13 @@ extern void _mainCRTStartup (void) __attribute__((weak));
 void _mainCRTStartup(void)
 {
     unsigned long *src;
-#ifdef ROM
     unsigned long *dst;
-#endif
+
+    // Copy vector table from SRAM to IRAM0 (ARM vector table must be at 0x00000000)
+    src = &_start_vectors;
+    dst = (unsigned long *)0x00000000;
+    while(src < &_end_vectors)
+        *(dst++) = *(src++);
 
 #ifdef ROM
     // Running from ROM: copy data section to RAM
diff --git a/ports/arm/platforms/dm36x/system.ld b/ports/arm/platforms/dm36x/system.ld
index c6c5219..cacbfeb 100644
--- a/ports/arm/platforms/dm36x/system.ld
+++ b/ports/arm/platforms/dm36x/system.ld
@@ -24,7 +24,9 @@ SECTIONS
     
     .text :
     {
+        _start_vectors = .;
         *(.vectors)
+        _end_vectors = .;
         /* Startup assembly */
         *(.startup)
         *(.init)