diff --git a/sys/arch/dreamcast/dev/maple/mmemcard.c b/sys/arch/dreamcast/dev/maple/mmemcard.c
index 08e8a4f1f2b2..617dbf96f5e9 100644
--- a/sys/arch/dreamcast/dev/maple/mmemcard.c
+++ b/sys/arch/dreamcast/dev/maple/mmemcard.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: mmemcard.c,v 1.9 2007/03/04 05:59:44 christos Exp $	*/
+/*	$NetBSD: mmemcard.c,v 1.10 2007/03/06 23:50:20 he Exp $	*/
 
 /*-
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mmemcard.c,v 1.9 2007/03/04 05:59:44 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mmemcard.c,v 1.10 2007/03/06 23:50:20 he Exp $");
 
 #include <sys/param.h>
 #include <sys/buf.h>
@@ -869,7 +869,7 @@ mmemdone(struct mmem_softc *sc, struct mmem_pt *pt, int err)
 	KASSERT(bp);
 
 	if (err) {
-		bcnt = sc->sc_iobuf - bp->b_data;
+		bcnt = (char *)sc->sc_iobuf - (char *)bp->b_data;
 		bp->b_resid = bp->b_bcount - bcnt;
 
 		/* raise error if no block is read */
@@ -886,7 +886,8 @@ mmemdone(struct mmem_softc *sc, struct mmem_pt *pt, int err)
 		/* terminate current transfer */
 		sc->sc_bp = NULL;
 		s = splbio();
-		disk_unbusy(&pt->pt_dk, sc->sc_iobuf - bp->b_data,
+		disk_unbusy(&pt->pt_dk,
+		    (char *)sc->sc_iobuf - (char *)bp->b_data,
 		    sc->sc_stat == MMEM_READ);
 		biodone(bp);
 		splx(s);
diff --git a/sys/arch/evbppc/evbppc/disksubr.c b/sys/arch/evbppc/evbppc/disksubr.c
index 27e12dc73f26..a23378b609df 100644
--- a/sys/arch/evbppc/evbppc/disksubr.c
+++ b/sys/arch/evbppc/evbppc/disksubr.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: disksubr.c,v 1.11 2006/11/25 13:09:14 scw Exp $	*/
+/*	$NetBSD: disksubr.c,v 1.12 2007/03/07 00:20:57 he Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.11 2006/11/25 13:09:14 scw Exp $");
+__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.12 2007/03/07 00:20:57 he Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -94,7 +94,8 @@ readdisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp,
 	}
 
 	for (dlp = (struct disklabel *)bp->b_data;
-	    dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - sizeof(*dlp));
+	    dlp <= (struct disklabel *)((char *)bp->b_data + lp->d_secsize -
+		sizeof(*dlp));
 	    dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
 		if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
 			if (msg == NULL)
@@ -240,7 +241,8 @@ writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp,
 	if ((error = biowait(bp)) != 0)
 		goto done;
 	for (dlp = (struct disklabel *)bp->b_data;
-	    dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - sizeof(*dlp));
+	    dlp <= (struct disklabel *)((char *)bp->b_data + lp->d_secsize -
+		sizeof(*dlp));
 	    dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
 		if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
 		    dkcksum(dlp) == 0) {