From 663bc8a8cd02b92da172ac53f03ed71f3ba082de Mon Sep 17 00:00:00 2001
From: davidhay <davidhay@localhost>
Date: Sat, 21 Mar 2009 19:33:39 +0000
Subject: [PATCH] fatalerror if the SH4 mmu is turned on.

looks like quite a few NaomiGDs need it.. Ikaruga, Border Down, Senko etc. etc.
---
 src/emu/cpu/sh4/sh4comn.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/emu/cpu/sh4/sh4comn.c b/src/emu/cpu/sh4/sh4comn.c
index a1447684a12..75e0b0fae8f 100644
--- a/src/emu/cpu/sh4/sh4comn.c
+++ b/src/emu/cpu/sh4/sh4comn.c
@@ -641,6 +641,12 @@ WRITE32_HANDLER( sh4_internal_w )
 
 	switch( offset )
 	{
+	case MMUCR: // MMU Control
+		if (data & 1)
+			fatalerror("SH4: MMUCR write enables MMU\n");
+	
+		break;
+	
 		// Memory refresh
 	case RTCSR:
 		sh4->m[RTCSR] &= 255;