From 4c0f07e3925a807fc67822ab724a7b6289c29d09 Mon Sep 17 00:00:00 2001
From: Dale Rahn <drahn@cvs.openbsd.org>
Date: Sat, 3 Mar 2001 05:40:02 +0000
Subject: Change how PCI bus memory base address is found for powerpc. This is
 probably quite a hack. however some bridges have multiple "memory" segment
 according to the openfirmware data. one is the pci device probe register
 area, and the one or two more that are real address regions. Such as base
 0x80000000 sz 0x10000000, base 0x90000000 sz 0x10000000. This should really
 be one region but detecting the "last" region to avoid the first region
 causes the wrong base address to be picked. Currently this hardcodes it to
 0x80000000 because it seems to work for "normal" pci currently. openfirmware
 puts full address in the field and the other devices seem to work on tested
 machines.

---
 sys/arch/powerpc/pci/mpcpcibus.c | 36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

diff --git a/sys/arch/powerpc/pci/mpcpcibus.c b/sys/arch/powerpc/pci/mpcpcibus.c
index b2309155132..b156544fa11 100644
--- a/sys/arch/powerpc/pci/mpcpcibus.c
+++ b/sys/arch/powerpc/pci/mpcpcibus.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mpcpcibus.c,v 1.22 2000/10/19 04:53:06 drahn Exp $ */
+/*	$OpenBSD: mpcpcibus.c,v 1.23 2001/03/03 05:40:01 drahn Exp $ */
 
 /*
  * Copyright (c) 1997 Per Fogelstrom
@@ -411,28 +411,18 @@ mpcpcibrattach(parent, self, aux)
 						prange[found].base;
 				}
 
-				found = 0;
-				/* find mem base, flag == 0x02000000 */
-				for (i = 0; i < rangelen ; i++)
-				{
-					if (prange[i].flags == 0x02000000) {
-						/* find last? */
-						found = i;
-					}
-				}
-				/* found the mem space ranges */
-				if (prange[found].flags == 0x02000000) {
-					sc->sc_membus_space.bus_base =
-						prange[found].base;
-
-				}
-				if ( (sc->sc_iobus_space.bus_base == 0) ||
-					(sc->sc_membus_space.bus_base == 0)) {
-					printf("io or memory base not found"
-						"mem %x io %x\n",
-						sc->sc_membus_space.bus_base,
-						sc->sc_iobus_space.bus_base);
-				}
+				/* the mem space ranges 
+				 * apple openfirmware always puts full
+				 * addresses in config information,
+				 * it is not necessary to have correct bus
+				 * base address, but since 0 is reserved
+				 * and all IO and device memory will be in
+				 * upper 2G of address space, set to
+				 * 0x80000000
+				 */
+                         
+				sc->sc_membus_space.bus_base = 0x80000000;
+				sc->sc_membus_space.bus_reverse = 1;
 
 			}
 
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