diff --git a/sys/arch/mac68k/dev/if_sn.c b/sys/arch/mac68k/dev/if_sn.c
index f66c653c1ca7..1cc3ce930ce0 100644
--- a/sys/arch/mac68k/dev/if_sn.c
+++ b/sys/arch/mac68k/dev/if_sn.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_sn.c,v 1.43 2007/03/04 06:00:07 christos Exp $	*/
+/*	$NetBSD: if_sn.c,v 1.44 2007/03/05 21:31:30 he Exp $	*/
 
 /*
  * National Semiconductor  DP8393X SONIC Driver
@@ -16,7 +16,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_sn.c,v 1.43 2007/03/04 06:00:07 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_sn.c,v 1.44 2007/03/05 21:31:30 he Exp $");
 
 #include "opt_inet.h"
 
@@ -595,7 +595,7 @@ sonicput(struct sn_softc *sc, struct mbuf *m0, int mtd_next)
 
 	if (totlen < ETHERMIN + ETHER_HDR_LEN) {
 		int pad = ETHERMIN + ETHER_HDR_LEN - totlen;
-		memset(mtdp->mtd_buf + totlen, 0, pad);
+		memset((char*)mtdp->mtd_buf + totlen, 0, pad);
 		totlen = ETHERMIN + ETHER_HDR_LEN;
 	}
 
@@ -793,12 +793,12 @@ initialise_rda(struct sn_softc *sc)
 
 	/* link the RDA's together into a circular list */
 	for (i = 0; i < (sc->sc_nrda - 1); i++) {
-		p_rda = sc->p_rda + (i * RXPKT_SIZE(sc));
+		p_rda = (char*)sc->p_rda + (i * RXPKT_SIZE(sc));
 		v_rda = sc->v_rda + ((i+1) * RXPKT_SIZE(sc));
 		SWO(bitmode, p_rda, RXPKT_RLINK, LOWER(v_rda));
 		SWO(bitmode, p_rda, RXPKT_INUSE, 1);
 	}
-	p_rda = sc->p_rda + ((sc->sc_nrda - 1) * RXPKT_SIZE(sc));
+	p_rda = (char*)sc->p_rda + ((sc->sc_nrda - 1) * RXPKT_SIZE(sc));
 	SWO(bitmode, p_rda, RXPKT_RLINK, LOWER(sc->v_rda) | EOL);
 	SWO(bitmode, p_rda, RXPKT_INUSE, 1);
 
@@ -985,7 +985,7 @@ sonictxint(struct sn_softc *sc)
 static void 
 sonicrxint(struct sn_softc *sc)
 {
-	void *	rda;
+	void *rda;
 	int orra;
 	int len;
 	int rramark;
@@ -993,7 +993,7 @@ sonicrxint(struct sn_softc *sc)
 	int bitmode = sc->bitmode;
 	u_int16_t rxpkt_ptr;
 
-	rda = sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));
+	rda = (char*)sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));
 
 	while (SRO(bitmode, rda, RXPKT_INUSE) == 0) {
 		u_int status = SRO(bitmode, rda, RXPKT_STATUS);
@@ -1002,7 +1002,7 @@ sonicrxint(struct sn_softc *sc)
 		rxpkt_ptr = SRO(bitmode, rda, RXPKT_PTRLO);
 		len = SRO(bitmode, rda, RXPKT_BYTEC) - FCSSIZE;
 		if (status & RCR_PRX) {
-			void *pkt = sc->rbuf[orra & RBAMASK] +
+			void *pkt = (char*)sc->rbuf[orra & RBAMASK] +
 			    m68k_page_offset(rxpkt_ptr);
 			if (sonic_read(sc, pkt, len))
 				sc->sc_if.if_ipackets++;
@@ -1056,14 +1056,16 @@ sonicrxint(struct sn_softc *sc)
 		SWO(bitmode, rda, RXPKT_INUSE, 1);
 		SWO(bitmode, rda, RXPKT_RLINK,
 			SRO(bitmode, rda, RXPKT_RLINK) | EOL);
-		SWO(bitmode, (sc->p_rda + (rdamark * RXPKT_SIZE(sc))), RXPKT_RLINK,
-			SRO(bitmode, (sc->p_rda + (rdamark * RXPKT_SIZE(sc))),
+		SWO(bitmode, ((char*)sc->p_rda + (rdamark * RXPKT_SIZE(sc))),
+			RXPKT_RLINK,
+			SRO(bitmode, ((char*)sc->p_rda +
+			    (rdamark * RXPKT_SIZE(sc))),
 			RXPKT_RLINK) & ~EOL);
 		sc->sc_rdamark = sc->sc_rxmark;
 
 		if (++sc->sc_rxmark >= sc->sc_nrda)
 			sc->sc_rxmark = 0;
-		rda = sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));
+		rda = (char*)sc->p_rda + (sc->sc_rxmark * RXPKT_SIZE(sc));
 	}
 }
 
@@ -1142,7 +1144,7 @@ sonic_get(struct sn_softc *sc, void *pkt, int datalen)
 		}
 
 		if (mp == &top) {
-			void *newdata = (void *)
+			char *newdata = (char *)
 			    ALIGN(m->m_data + sizeof(struct ether_header)) -
 			    sizeof(struct ether_header);
 			len -= newdata - m->m_data; 
@@ -1152,7 +1154,7 @@ sonic_get(struct sn_softc *sc, void *pkt, int datalen)
 		m->m_len = len = min(datalen, len);
 
 		memcpy(mtod(m, void *), pkt, len);
-		pkt += len;
+		pkt = (char*)pkt + len;
 		datalen -= len;
 		*mp = m;
 		mp = &m->m_next;