Fixes for IAP in RAM

Author: dc42

src/Hardware/Cache.cpp

@@ -152,6 +152,7 @@ void Cache::Disable() noexcept
 	if (enabled)
 	{
 #if SAME70
+		SCB_CleanDCache();
 		SCB_DisableICache();
 		SCB_DisableDCache();
 #elif SAM4E

src/Linux/LinuxInterface.cpp

@@ -15,6 +15,7 @@
 #include "Tools/Filament.h"
 #include "RepRap.h"
 #include "RepRapFirmware.h"
+#include <Hardware/Cache.h>
 
 #if HAS_LINUX_INTERFACE
 
@@ -268,6 +269,13 @@ void LinuxInterface::Spin()
 
 			// Launch the IAP binary
 			case LinuxRequest::StartIap:
+				reprap.EmergencyStop();			// turn off heaters etc.
+				Cache::Disable();				// this also flushes the data cache
+#if USE_MPU
+				//TODO consider setting flash memory to strongly-ordered instead
+				ARM_MPU_Disable();
+#endif
+
 #if !IAP_IN_RAM
 				// Lock the whole IAP flash area again and start the IAP binary
 				flash_lock(IAP_IMAGE_START, IAP_IMAGE_END, nullptr, nullptr);

src/Version.h

@@ -20,7 +20,7 @@
 #endif
 
 #ifndef DATE
-# define DATE "2019-12-16b1"
+# define DATE "2019-12-16b3"
 #endif
 
 #define AUTHORS "reprappro, dc42, chrishamm, t3p3, dnewman, printm3d"