From a472b10b6843db8a21e9f4a26fda66355b9befd3 Mon Sep 17 00:00:00 2001
From: Romain Goyet <romain.goyet@numworks.com>
Date: Tue, 15 Jan 2019 13:35:07 +0100
Subject: [PATCH] [ion/f730] Add JUMP_TO_EXTERNAL_FLASH

---
 ion/src/f730/boot/rt0.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/ion/src/f730/boot/rt0.cpp b/ion/src/f730/boot/rt0.cpp
index 852cd7edb..6e10b70ac 100644
--- a/ion/src/f730/boot/rt0.cpp
+++ b/ion/src/f730/boot/rt0.cpp
@@ -57,12 +57,11 @@ void start() {
   size_t bssSectionLength = (&_bss_section_end_ram - &_bss_section_start_ram);
   memset(&_bss_section_start_ram, 0, bssSectionLength);
 
+#define JUMP_TO_EXTERNAL_FLASH 1
+#if JUMP_TO_EXTERNAL_FLASH
   /* Initialize the FPU as early as possible.
    * For example, static C++ objects are very likely to manipulate float values */
   Ion::Device::initFPU();
-
-#if 1
-  Ion::Device::initMPU();
 #endif
 
   /* Call static C++ object constructors
@@ -85,9 +84,18 @@ void start() {
   }
 #endif
 
+#if JUMP_TO_EXTERNAL_FLASH
   Ion::Device::init();
 
+  typedef void(*ISR)(void);
+
+//  non_inlined_ion_main();
+
+  ISR externalFlashReset = *(ISR *)(0x90000004);
+  externalFlashReset();
+#else
   non_inlined_ion_main();
+#endif
 
   abort();
 }