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clarify comment in previous

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( this is a hack, should go away when the root cause is fixed etc. )
no functional change
This commit is contained in:
macallan 2021-04-02 16:59:59 +00:00
parent 15fe6af379
commit e99657a23f
1 changed files with 8 additions and 5 deletions
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13
sys/arch/powerpc/oea/ofwoea_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: ofwoea_machdep.c,v 1.60 2021/04/01 22:02:20 macallan Exp $ */
/* $NetBSD: ofwoea_machdep.c,v 1.61 2021/04/02 16:59:59 macallan Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofwoea_machdep.c,v 1.60 2021/04/01 22:02:20 macallan Exp $");
__KERNEL_RCSID(0, "$NetBSD: ofwoea_machdep.c,v 1.61 2021/04/02 16:59:59 macallan Exp $");
#include "ksyms.h"
#include "wsdisplay.h"
@ -379,9 +379,12 @@ restore_ofmap(void)
continue;
/*
* XXX
* my beige G3 throws a DSI trap if we try to map the last page
* of the firmware ROM
* XXX macallan@
* My beige G3 throws a DSI trap if we try to map the last page
* of the 32bit address space. On old world macs the firmware
* ROM occupies 4MB at 0xffc00000, triggering it when we
* restore OF translations. This just works around a bug
* elsewhere in pmap and should go away once fixed there.
*/
if (pa == 0xffc00000 && size == 0x400000)
size = 0x3ff000;