support loading extra RSA keys from dsikeys.bin file (to dump from haxed DSi)

src/DSi.cpp

@@ -68,6 +68,8 @@ DSi_SDHost* SDIO;
 u64 ConsoleID;
 u8 eMMC_CID[16];
 
+u8 ITCMInit[0x8000];
+
 
 bool Init()
 {
@@ -112,6 +114,8 @@ void Reset()
     NDMACnt[0] = 0; NDMACnt[1] = 0;
     for (int i = 0; i < 8; i++) NDMAs[i]->Reset();
 
+    memcpy(NDS::ARM9->ITCM, ITCMInit, 0x8000);
+
     DSi_I2C::Reset();
     DSi_AES::Reset();
 
@@ -303,6 +307,22 @@ bool LoadNAND()
         fclose(f);
     }
 
+    memset(ITCMInit, 0, 0x8000);
+
+    f = fopen("dsikeys.bin", "rb");
+    if (f)
+    {
+        // first 0x2524 bytes are loaded to 0x01FFC400
+
+        u32 dstaddr = 0x01FFC400;
+        fread(&ITCMInit[dstaddr & 0x7FFF], 0x2524, 1, f);
+        fclose(f);
+    }
+    else
+    {
+        printf("DSi keys not found\n");
+    }
+
     return true;
 }