[src/trunk]: src/sys/arch/macppc/stand/ofwboot Don't set garbages into BAT re...

[tsutsui <tsutsui%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/99921a71a7d0
branches:  trunk
changeset: 339516:99921a71a7d0
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun Jul 26 14:24:29 2015 +0000

description:
Don't set garbages into BAT registers, which was broken in rev 1.25.

Should fix PR port-macppc/50018 (though there is no response for 3 weeks),
and should be pulled up to netbsd-7.

diffstat:

 sys/arch/macppc/stand/ofwboot/Locore.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 0e54b2d3c5bb -r 99921a71a7d0 sys/arch/macppc/stand/ofwboot/Locore.c
--- a/sys/arch/macppc/stand/ofwboot/Locore.c    Sun Jul 26 14:01:53 2015 +0000
+++ b/sys/arch/macppc/stand/ofwboot/Locore.c    Sun Jul 26 14:24:29 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: Locore.c,v 1.25 2014/02/26 21:42:40 macallan Exp $     */
+/*     $NetBSD: Locore.c,v 1.26 2015/07/26 14:24:29 tsutsui Exp $      */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -75,6 +75,7 @@
 "       cmpi    0,1,%r0,0x02   \n" /* 601 CPU = 0x0001 */
 "       blt     1f             \n" /* skip over non-601 BAT setup */
        /*non PPC 601 BATs*/
+"      li      %r0,0           \n"
 "      mtibatu 0,%r0           \n"
 "      mtibatu 1,%r0           \n"
 "      mtibatu 2,%r0           \n"
@@ -93,7 +94,8 @@
 "      b 2f                    \n"
 
        /* PPC 601 BATs*/
-"1:    mtibatu 0,%r0           \n"
+"1:    li      %r0,0           \n"
+"      mtibatu 0,%r0           \n"
 "              mtibatu 1,%r0           \n"
 "              mtibatu 2,%r0           \n"
 "              mtibatu 3,%r0           \n"