From 5ccf8d6b972be025befee344e873c492191e75ae Mon Sep 17 00:00:00 2001
From: Gabriel Ozouf <gabriel.ozouf@numworks.com>
Date: Thu, 25 Mar 2021 16:41:05 +0100
Subject: [PATCH] [ion/device/external_flash] Add dsb instruction in method
 wait

This mimics the behavior of InternalFlash::wait, and fixes a bug found
on the bench when reading the flashed firmware.
---
 ion/src/device/shared/drivers/external_flash.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ion/src/device/shared/drivers/external_flash.cpp b/ion/src/device/shared/drivers/external_flash.cpp
index 65b6bcdb3..8e8886421 100644
--- a/ion/src/device/shared/drivers/external_flash.cpp
+++ b/ion/src/device/shared/drivers/external_flash.cpp
@@ -1,4 +1,5 @@
 #include "external_flash.h"
+#include <drivers/cache.h>
 #include <drivers/config/external_flash.h>
 #include <drivers/config/clocks.h>
 #include <ion/timing.h>
@@ -179,6 +180,7 @@ static inline void send_read_command(Command c, uint8_t * address, uint8_t * dat
 }
 
 static inline void wait() {
+  Cache::dsb();
   ExternalFlashStatusRegister::StatusRegister1 statusRegister1(0);
   do {
     send_read_command(Command::ReadStatusRegister1, reinterpret_cast<uint8_t *>(FlashAddressSpaceSize), reinterpret_cast<uint8_t *>(&statusRegister1), sizeof(statusRegister1));