Patch mpu configurations when running off SLOT-2 (#1748)

Change the mpu settings when a SLOT-2 device is being used, fixes issues with games like gen5 pokemon, that block the whole address space beyond 0x08000000 when not in use

retail/cardengine/arm9/source/cardengine.c

@@ -189,6 +189,9 @@ void enableIPC_SYNC(void) {
 #endif
 
 extern void slot2MpuFix();
+// fixes mpu protection settings when using a slot2 flashcart
+// to allow running games accessing the slot2 like pokemon
+extern void slot2MpuFixGbaDldi();
 // extern void region0Fix(); // Revert region 0 patch
 extern void sdk5MpuFix();
 extern void resetMpu();
@@ -863,6 +866,7 @@ void cardRead(u32* cacheStruct, u8* dst0, u32 src0, u32 len0) {
 
 	if (__myio_dldi.features & FEATURE_SLOT_GBA) {
 		REG_IE &= ~IRQ_CART;
+		slot2MpuFixGbaDldi();
 	}
 
 	setDeviceOwner();
@@ -1573,6 +1577,10 @@ u32 myIrqEnable(u32 irq) {
 	nocashMessage("myIrqEnable\n");
 	#endif
 
+	if (__myio_dldi.features & FEATURE_SLOT_GBA) {
+		slot2MpuFixGbaDldi();
+	}
+
 	setDeviceOwner();
 	initialize();
 

retail/cardengine/arm9/source/mpuConfig.s

@@ -1,6 +1,21 @@
 .align	4
 .arm
 
+.global slot2MpuFixGbaDldi
+.type slot2MpuFixGbaDldi, STT_FUNC
+slot2MpuFixGbaDldi:
+    mrc p15, 0, r0, c2, c0, 0
+    bic r0, r0, #(1 << 3)
+    mcr p15, 0, r0, c2, c0, 0
+    mrc p15, 0, r0, c3, c0, 0
+    bic r0, r0, #(1 << 3)
+    mcr p15, 0, r0, c3, c0, 0
+    mrc p15, 0, r0, c5, c0, 2
+    bic r0, r0, #(0xF << 12)
+    orr r0, r0, #(3 << 12)
+    mcr p15, 0, r0, c5, c0, 2
+    bx lr
+
 .global slot2MpuFix
 .type	slot2MpuFix STT_FUNC
 slot2MpuFix: