Add a minimal bus_space_mmap which always fails. The MEMC can only map DRAM

into the user's address space -- I/O devices can only ever be got at by the
kernel.

sys/arch/arm26/include/bus.h

@@ -1,4 +1,4 @@
-/* $NetBSD: bus.h,v 1.5 2001/06/12 20:16:23 bjh21 Exp $ */
+/* $NetBSD: bus.h,v 1.6 2001/09/11 11:38:59 bjh21 Exp $ */
 
 /*-
  * Copyright (c) 2000 Ben Harris
@@ -70,6 +70,9 @@ extern int bus_space_shift(bus_space_tag_t, bus_space_handle_t, int,
 #define bus_space_alloc(t, rs, re, s, a, b, c, ap, hp) (-1)
 #define bus_space_free(t, h, s) /* Do nothing */
 
+/* Mapping bus space into user address space (impossible on arm26) */
+#define bus_space_mmap(t, a, o, p, f) (-1)
+
 /* Used by ne2000.c */
 #define BUS_SPACE_ALIGNED_POINTER ALIGNED_POINTER