diff --git a/hw/xfree86/loader/xf86sym.c b/hw/xfree86/loader/xf86sym.c
index d925bed..8a2768d 100644
--- a/hw/xfree86/loader/xf86sym.c
+++ b/hw/xfree86/loader/xf86sym.c
@@ -259,6 +259,7 @@ _X_HIDDEN void *xfree86LookupTab[] = {
     SYMFUNC(xf86UDelay)
     SYMFUNC(xf86IODelay)
     SYMFUNC(xf86SlowBcopy)
+    SYMFUNC(xf86SetReallySlowBcopy)
 #ifdef __alpha__
     SYMFUNC(xf86SlowBCopyToBus)
     SYMFUNC(xf86SlowBCopyFromBus)
diff --git a/hw/xfree86/os-support/misc/SlowBcopy.c b/hw/xfree86/os-support/misc/SlowBcopy.c
index 7694eaa..5cd7168 100644
--- a/hw/xfree86/os-support/misc/SlowBcopy.c
+++ b/hw/xfree86/os-support/misc/SlowBcopy.c
@@ -22,21 +22,37 @@
 #include "xf86_OSlib.h"
 #include "compiler.h"
 
-/* The outb() isn't needed on my machine, but who knows ... -- ost */
+static int really_slow_bcopy;
+
 _X_EXPORT void
-xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
+xf86SetReallySlowBcopy(void)
+{
+	really_slow_bcopy = 1;
+}
+
+#if defined(__i386__) || defined(__x86_64__)
+static void xf86_really_slow_bcopy(unsigned char *src, unsigned char *dst, int len)
 {
     while(len--)
     {
 	*dst++ = *src++;
-#if !defined(__sparc__) && \
-    !defined(__powerpc__) && \
-    !defined(__mips__) && \
-    !defined(__ia64__) && \
-    !defined(__arm__)
 	outb(0x80, 0x00);
+    }
+}
 #endif
+
+/* The outb() isn't needed on my machine, but who knows ... -- ost */
+_X_EXPORT void
+xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
+{
+#if defined(__i386__) || defined(__x86_64__)
+    if (really_slow_bcopy) {
+	xf86_really_slow_bcopy(src, dst, len);
+	return;
     }
+#endif
+    while(len--)
+	*dst++ = *src++;
 }
 
 #ifdef __alpha__
diff --git a/hw/xfree86/os-support/xf86_OSproc.h b/hw/xfree86/os-support/xf86_OSproc.h
index 1bbbf56..6f0391d 100644
--- a/hw/xfree86/os-support/xf86_OSproc.h
+++ b/hw/xfree86/os-support/xf86_OSproc.h
@@ -159,6 +159,7 @@ extern void xf86BusToMem(unsigned char *, unsigned char *, int);
 extern void xf86MemToBus(unsigned char *, unsigned char *, int);
 extern void xf86IODelay(void);
 extern void xf86UDelay(long usec);
+extern void xf86SetReallySlowBcopy(void);
 extern void xf86SlowBcopy(unsigned char *, unsigned char *, int);
 extern int xf86OpenSerial(pointer options);
 extern int xf86SetSerial(int fd, pointer options);