diff --git a/emulators/bochs/Makefile b/emulators/bochs/Makefile
index 233700e6a56..b33af2b8525 100644
--- a/emulators/bochs/Makefile
+++ b/emulators/bochs/Makefile
@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.52 2011/12/02 14:36:14 espie Exp $
+# $OpenBSD: Makefile,v 1.53 2011/12/05 14:56:27 giovanni Exp $
 
 COMMENT=	x86 machine simulator
 
 DISTNAME=	bochs-2.5
+REVISION=	1
 CATEGORIES=	emulators
 MASTER_SITES=	${MASTER_SITE_SOURCEFORGE:=bochs/}
 
diff --git a/emulators/bochs/patches/patch-iodev_iodev_h b/emulators/bochs/patches/patch-iodev_iodev_h
new file mode 100644
index 00000000000..28211c38795
--- /dev/null
+++ b/emulators/bochs/patches/patch-iodev_iodev_h
@@ -0,0 +1,23 @@
+$OpenBSD: patch-iodev_iodev_h,v 1.1 2011/12/05 14:56:27 giovanni Exp $
+
+Fix for busmaster DMA transfers from device to memory
+
+--- iodev/iodev.h.orig	Thu Dec  1 04:31:04 2011
++++ iodev/iodev.h	Thu Dec  1 04:32:51 2011
+@@ -648,15 +648,10 @@ BX_CPP_INLINE void DEV_MEM_WRITE_PHYSICAL(bx_phy_addre
+ 
+ BX_CPP_INLINE void DEV_MEM_WRITE_PHYSICAL_BLOCK(bx_phy_address phy_addr, unsigned len, Bit8u *ptr)
+ {
+-  Bit8u *memptr;
+-
+   while(len > 0) { 
+     unsigned remainingInPage = 0x1000 - (phy_addr & 0xfff);
+     if (len < remainingInPage) remainingInPage = len;
+-    memptr = BX_MEM(0)->getHostMemAddr(NULL, phy_addr, BX_WRITE);
+-    if (memptr != NULL) {
+-      memcpy(memptr, ptr, remainingInPage);
+-    }
++    BX_MEM(0)->writePhysicalBlock(phy_addr, remainingInPage, ptr);
+     ptr += remainingInPage;
+     phy_addr += remainingInPage;
+     len -= remainingInPage;
diff --git a/emulators/bochs/patches/patch-memory_memory_cc b/emulators/bochs/patches/patch-memory_memory_cc
new file mode 100644
index 00000000000..07849553f7f
--- /dev/null
+++ b/emulators/bochs/patches/patch-memory_memory_cc
@@ -0,0 +1,19 @@
+$OpenBSD: patch-memory_memory_cc,v 1.3 2011/12/05 14:56:27 giovanni Exp $
+
+Fix for busmaster DMA transfers from device to memory
+
+--- memory/memory.cc.orig	Thu Dec  1 04:34:02 2011
++++ memory/memory.cc	Thu Dec  1 04:35:34 2011
+@@ -365,3 +365,12 @@ inc_one:
+     }
+   }
+ }
++
++void BX_MEM_C::writePhysicalBlock(bx_phy_address addr, unsigned len, void *data)
++{
++  Bit8u *memptr = getHostMemAddr(NULL, addr, BX_WRITE);
++  if (memptr != NULL) {
++    pageWriteStampTable.decWriteStamp(addr);
++    memcpy(memptr, data, len);
++  }
++}
diff --git a/emulators/bochs/patches/patch-memory_memory_h b/emulators/bochs/patches/patch-memory_memory_h
new file mode 100644
index 00000000000..85982d89dd2
--- /dev/null
+++ b/emulators/bochs/patches/patch-memory_memory_h
@@ -0,0 +1,14 @@
+$OpenBSD: patch-memory_memory_h,v 1.1 2011/12/05 14:56:27 giovanni Exp $
+
+Fix for busmaster DMA transfers from device to memory
+
+--- memory/memory.h.orig	Thu Dec  1 04:34:13 2011
++++ memory/memory.h	Thu Dec  1 04:34:53 2011
+@@ -101,6 +101,7 @@ class BOCHSAPI BX_MEM_C : public logfunctions { (publi
+                                       unsigned len, void *data);
+   BX_MEM_SMF void    writePhysicalPage(BX_CPU_C *cpu, bx_phy_address addr,
+                                        unsigned len, void *data);
++  BX_MEM_SMF void    writePhysicalBlock(bx_phy_address addr, unsigned len, void *data);
+   BX_MEM_SMF void    load_ROM(const char *path, bx_phy_address romaddress, Bit8u type);
+   BX_MEM_SMF void    load_RAM(const char *path, bx_phy_address romaddress, Bit8u type);
+ #if (BX_DEBUGGER || BX_DISASM || BX_GDBSTUB)