From 2d9a70b11af0bd00f770544466013f69fc1b6e75 Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Sun, 4 Jan 2004 01:14:07 +0000
Subject: Working kluge to ``enable'' the on-board SCSI controller on 187 and
 197, if it is not the boot device and has not been expliictely ``enabled'' in
 the BUG.

Will definitely help netboot installations...
---
 sys/arch/mvme88k/dev/bugio.c     | 11 ++++++++++-
 sys/arch/mvme88k/dev/ssh.c       | 20 ++++++++++++++++++--
 sys/arch/mvme88k/include/bugio.h |  3 ++-
 3 files changed, 30 insertions(+), 4 deletions(-)

(limited to 'sys/arch')

diff --git a/sys/arch/mvme88k/dev/bugio.c b/sys/arch/mvme88k/dev/bugio.c
index a8ae21fcf9f..6aa80ba0dc3 100644
--- a/sys/arch/mvme88k/dev/bugio.c
+++ b/sys/arch/mvme88k/dev/bugio.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bugio.c,v 1.10 2003/09/01 19:14:01 miod Exp $ */
+/*	$OpenBSD: bugio.c,v 1.11 2004/01/04 01:14:04 miod Exp $ */
 /*  Copyright (c) 1998 Steve Murphree, Jr. */
 
 #include <sys/param.h>
@@ -173,3 +173,12 @@ bugbrdid(struct mvmeprom_brdid *id)
 
 	bcopy(ptr, id, sizeof(struct mvmeprom_brdid));
 }
+
+void
+bugdiskrd(struct mvmeprom_dskio *dio)
+{
+	BUGCTXT();
+	__asm__ __volatile__ ("or r2, r0, %0" : : "r" (dio));
+	MVMEPROM_CALL(MVMEPROM_DSKRD);
+	OSCTXT();
+}
diff --git a/sys/arch/mvme88k/dev/ssh.c b/sys/arch/mvme88k/dev/ssh.c
index d9b6bc732b5..1a2bd72f0d5 100644
--- a/sys/arch/mvme88k/dev/ssh.c
+++ b/sys/arch/mvme88k/dev/ssh.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ssh.c,v 1.21 2004/01/02 23:48:01 miod Exp $	*/
+/*	$OpenBSD: ssh.c,v 1.22 2004/01/04 01:14:04 miod Exp $	*/
 
 /*
  * Copyright (c) 1994 Michael L. Hitch
@@ -52,6 +52,8 @@
 #include <machine/autoconf.h>
 #include <machine/cmmu.h>
 #include <machine/pmap.h>
+#include <machine/bugio.h>
+#include <machine/prom.h>
 
 #include <scsi/scsi_all.h>
 #include <scsi/scsiconf.h>
@@ -216,9 +218,23 @@ sshmatch(pdp, vcf, args)
 	 * For some reason, if the SCSI hardware is not ``warmed'' by the
 	 * BUG (netboot or boot from external SCSI controller), badvaddr()
 	 * will always fail, although the hardware is there.
+	 * Since the BUG will do the right thing, we'll defer a dummy read
+	 * from the controller and retry.
 	 */
 	if (brdtyp == BRD_187 || brdtyp == BRD_197) {
-		/* do something to enable the controller??? */
+		struct mvmeprom_dskio dio;
+		char buf[MVMEPROM_BLOCK_SIZE];
+
+#ifdef DEBUG
+		printf("sshmatch: trying to warm up controller\n");
+#endif
+		bzero(&dio, sizeof dio);
+		dio.pbuffer = buf;
+		dio.blk_cnt = 1;
+		bugdiskrd(&dio);
+
+		if (badvaddr((vaddr_t)IIOV(ca->ca_vaddr), 4) == 0)
+			return (1);
 	}
 
 	return (0);
diff --git a/sys/arch/mvme88k/include/bugio.h b/sys/arch/mvme88k/include/bugio.h
index 2f58b700b47..cdc62d71d66 100644
--- a/sys/arch/mvme88k/include/bugio.h
+++ b/sys/arch/mvme88k/include/bugio.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bugio.h,v 1.13 2002/03/14 01:26:39 millert Exp $ */
+/*	$OpenBSD: bugio.h,v 1.14 2004/01/04 01:14:06 miod Exp $ */
 
 #ifndef __MACHINE_BUGIO_H__
 #define __MACHINE_BUGIO_H__
@@ -15,5 +15,6 @@ void bugoutstr(char *, char *);
 void bugrtcrd(struct mvmeprom_time *);
 void bugreturn(void);
 void bugbrdid(struct mvmeprom_brdid *);
+void bugdiskrd(struct mvmeprom_dskio *);
 
 #endif /* __MACHINE_BUGIO_H__ */
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