as a stop-gap measure to allow boot-from-disk to work on hppa,

add some padding to the end of struct scsipi_xfer on that platform.

doc/HACKS

@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.46 2005/05/11 13:10:21 chs Exp $
+# $NetBSD: HACKS,v 1.47 2005/05/18 13:58:10 chs Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -455,3 +455,14 @@ port	hppa
 		gcc 3.3.3 generates bad code for dfa.c with -O2,
 		reduce optimization to -O1 to avoid the bug.
 	kcah
+
+	hack	hppa boot-from-disk memory corruption
+	cdate	Wed May 18 06:56:07 PDT 2005
+	who	chs
+	file	src/sys/dev/scsipi/scsipiconf.h : 1.98
+	descr
+		There is some bug with DMA on hppa that corrupts scsipi_xfer
+		structures, but it only shows up when booting from disk.
+		For now, we'll add some padding to scsipi_xfer so that
+		the corrupted memory is not otherwise used.
+	kcah

sys/dev/scsipi/scsipiconf.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: scsipiconf.h,v 1.97 2005/02/27 00:27:48 perry Exp $	*/
+/*	$NetBSD: scsipiconf.h,v 1.98 2005/05/18 13:58:10 chs Exp $	*/
 
 /*-
  * Copyright (c) 1998, 1999, 2000, 2004 The NetBSD Foundation, Inc.
@@ -533,6 +533,11 @@ struct scsipi_xfer {
 
 	struct	scsipi_generic cmdstore
 	    __attribute__ ((aligned (4)));/* stash the command in here */
+
+#ifdef __hppa__
+	/* XXX temp hack until we fix the memory corruption bug */
+	u_int8_t pad[32];
+#endif
 };
 
 /*