From c3675af538b2e6f3e812e786e973029d613e8e9f Mon Sep 17 00:00:00 2001
From: StapleButter <thetotalworm@gmail.com>
Date: Thu, 9 Nov 2017 16:02:37 +0100
Subject: [PATCH] properly reset IE/IF, fixes some reset issues.

---
 src/NDS.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/NDS.cpp b/src/NDS.cpp
index d4f6594c..ab7b5a26 100644
--- a/src/NDS.cpp
+++ b/src/NDS.cpp
@@ -290,7 +290,11 @@ void Reset()
     memset(ROMSeed1, 0, 2*8);
 
     IME[0] = 0;
+    IE[0] = 0;
+    IF[0] = 0;
     IME[1] = 0;
+    IE[1] = 0;
+    IF[1] = 0;
 
     PostFlag9 = 0x00;
     PostFlag7 = 0x00;
@@ -395,6 +399,7 @@ void RunSystem(s32 cycles)
             continue;
 
         SchedList[i].WaitCycles -= cycles;
+
         if (SchedList[i].WaitCycles < 1)
         {
             SchedListMask &= ~(1<<i);
@@ -943,6 +948,7 @@ u8 ARM9Read8(u32 addr)
 
     case 0x08000000:
     case 0x09000000:
+        printf("GBA read8 %08X\n", addr);
         return 0xFF;
     }
 
@@ -990,6 +996,7 @@ u16 ARM9Read16(u32 addr)
 
     case 0x08000000:
     case 0x09000000:
+        printf("GBA read16 %08X\n", addr);
         return 0xFFFF;
     }
 
@@ -1037,6 +1044,7 @@ u32 ARM9Read32(u32 addr)
 
     case 0x08000000:
     case 0x09000000:
+        printf("GBA read32 %08X\n", addr);
         return 0xFFFFFFFF;
     }
 
@@ -1105,7 +1113,7 @@ void ARM9Write16(u32 addr, u16 val)
         return;
     }
 
-    //printf("unknown arm9 write16 %08X %04X\n", addr, val);
+    printf("unknown arm9 write16 %08X %04X\n", addr, val);
 }
 
 void ARM9Write32(u32 addr, u32 val)
@@ -1598,6 +1606,8 @@ u32 ARM9IORead32(u32 addr)
     case 0x040000E8: return DMA9Fill[2];
     case 0x040000EC: return DMA9Fill[3];
 
+    case 0x040000F4: return 0; // ???? Golden Sun Dark Dawn keeps reading this
+
     case 0x04000100: return TimerGetCounter(0) | (Timers[0].Cnt << 16);
     case 0x04000104: return TimerGetCounter(1) | (Timers[1].Cnt << 16);
     case 0x04000108: return TimerGetCounter(2) | (Timers[2].Cnt << 16);