diff --git a/sys/dev/aic7xxx/aic7xxx.c b/sys/dev/aic7xxx/aic7xxx.c
index 7c6923b56fd..268aa2063d7 100644
--- a/sys/dev/aic7xxx/aic7xxx.c
+++ b/sys/dev/aic7xxx/aic7xxx.c
@@ -37,7 +37,7 @@
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
- * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.c#129 $
+ * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.c#130 $
  *
  * $FreeBSD$
  */
@@ -3573,7 +3573,7 @@ ahc_handle_ign_wide_residue(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
 
 		sgptr = ahc_inb(ahc, SCB_RESIDUAL_SGPTR);
 		if ((sgptr & SG_LIST_NULL) != 0
-		 && ahc_inb(ahc, DATA_COUNT_ODD) == 1) {
+		 && (ahc_inb(ahc, SCB_LUN) & SCB_XFERLEN_ODD) != 0) {
 			/*
 			 * If the residual occurred on the last
 			 * transfer and the transfer request was
@@ -3586,25 +3586,27 @@ ahc_handle_ign_wide_residue(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
 			uint32_t data_addr;
 			uint32_t sglen;
 
-			/* Pull in the rest of the sgptr */
-			sgptr |= (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 3) << 24)
-			      | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 2) << 16)
-			      | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 1) << 8);
-			sgptr &= SG_PTR_MASK;
-			data_cnt = (ahc_inb(ahc, SCB_RESIDUAL_DATACNT+3) << 24)
-				 | (ahc_inb(ahc, SCB_RESIDUAL_DATACNT+2) << 16)
-				 | (ahc_inb(ahc, SCB_RESIDUAL_DATACNT+1) << 8)
-				 | (ahc_inb(ahc, SCB_RESIDUAL_DATACNT));
+			/* Pull in all of the sgptr */
+			sgptr = ahc_inl(ahc, SCB_RESIDUAL_SGPTR);
+			data_cnt = ahc_inl(ahc, SCB_RESIDUAL_DATACNT);
 
-			data_addr = (ahc_inb(ahc, SHADDR + 3) << 24)
-				  | (ahc_inb(ahc, SHADDR + 2) << 16)
-				  | (ahc_inb(ahc, SHADDR + 1) << 8)
-				  | (ahc_inb(ahc, SHADDR));
+			if ((sgptr & SG_LIST_NULL) != 0) {
+				/*
+				 * The residual data count is not updated
+				 * for the command run to completion case.
+				 * Explicitly zero the count.
+				 */
+				data_cnt &= ~AHC_SG_LEN_MASK;
+			}
+
+			data_addr = ahc_inl(ahc, SHADDR);
 
 			data_cnt += 1;
 			data_addr -= 1;
+			sgptr &= SG_PTR_MASK;
 
 			sg = ahc_sg_bus_to_virt(scb, sgptr);
+
 			/*
 			 * The residual sg ptr points to the next S/G
 			 * to load so we must go back one.
@@ -3630,19 +3632,17 @@ ahc_handle_ign_wide_residue(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
 				 */
 				sg++;
 				sgptr = ahc_sg_virt_to_bus(scb, sg);
-				ahc_outb(ahc, SCB_RESIDUAL_SGPTR + 3,
-					 sgptr >> 24);
-				ahc_outb(ahc, SCB_RESIDUAL_SGPTR + 2,
-					 sgptr >> 16);
-				ahc_outb(ahc, SCB_RESIDUAL_SGPTR + 1,
-					 sgptr >> 8);
-				ahc_outb(ahc, SCB_RESIDUAL_SGPTR, sgptr);
 			}
-
-			ahc_outb(ahc, SCB_RESIDUAL_DATACNT + 3, data_cnt >> 24);
-			ahc_outb(ahc, SCB_RESIDUAL_DATACNT + 2, data_cnt >> 16);
-			ahc_outb(ahc, SCB_RESIDUAL_DATACNT + 1, data_cnt >> 8);
-			ahc_outb(ahc, SCB_RESIDUAL_DATACNT, data_cnt);
+			ahc_outl(ahc, SCB_RESIDUAL_SGPTR, sgptr);
+			ahc_outl(ahc, SCB_RESIDUAL_DATACNT, data_cnt);
+			/*
+			 * Toggle the "oddness" of the transfer length
+			 * to handle this mid-transfer ignore wide
+			 * residue.  This ensures that the oddness is
+			 * correct for subsequent data transfers.
+			 */
+			ahc_outb(ahc, SCB_LUN,
+				 ahc_inb(ahc, SCB_LUN) ^ SCB_XFERLEN_ODD);
 		}
 	}
 }
diff --git a/sys/dev/aic7xxx/aic7xxx.h b/sys/dev/aic7xxx/aic7xxx.h
index adabee6ae95..13dd8119113 100644
--- a/sys/dev/aic7xxx/aic7xxx.h
+++ b/sys/dev/aic7xxx/aic7xxx.h
@@ -37,7 +37,7 @@
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
- * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.h#76 $
+ * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.h#77 $
  *
  * $FreeBSD$
  */
@@ -93,7 +93,7 @@ struct seeprom_descriptor;
 #define	SCB_GET_CHANNEL(ahc, scb) \
 	SCSIID_CHANNEL(ahc, (scb)->hscb->scsiid)
 #define	SCB_GET_LUN(scb) \
-	((scb)->hscb->lun)
+	((scb)->hscb->lun & LID)
 #define SCB_GET_TARGET_OFFSET(ahc, scb)	\
 	(SCB_GET_TARGET(ahc, scb) + (SCB_IS_SCSIBUS_B(ahc, scb) ? 8 : 0))
 #define SCB_GET_TARGET_MASK(ahc, scb) \
diff --git a/sys/dev/aic7xxx/aic7xxx.reg b/sys/dev/aic7xxx/aic7xxx.reg
index 49bc1f2b37c..810ec700d9f 100644
--- a/sys/dev/aic7xxx/aic7xxx.reg
+++ b/sys/dev/aic7xxx/aic7xxx.reg
@@ -39,7 +39,7 @@
  *
  * $FreeBSD$
  */
-VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.reg#38 $"
+VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.reg#39 $"
 
 /*
  * This file is processed by the aic7xxx_asm utility for use in assembling
@@ -1080,7 +1080,8 @@ scb {
 		mask	OID				0x0f
 	}
 	SCB_LUN {
-		mask	LID				0xff
+		field	SCB_XFERLEN_ODD			0x80
+		mask	LID				0x3f
 		size	1
 	}
 	SCB_TAG {
@@ -1239,7 +1240,6 @@ register SG_CACHE_PRE {
 	access_mode WO
 	address			0x0fc
 	mask	SG_ADDR_MASK	0xf8
-	field	ODD_SEG		0x04
 	field	LAST_SEG	0x02
 	field	LAST_SEG_DONE	0x01
 }
@@ -1248,7 +1248,6 @@ register SG_CACHE_SHADOW {
 	access_mode RO
 	address			0x0fc
 	mask	SG_ADDR_MASK	0xf8
-	field	ODD_SEG		0x04
 	field	LAST_SEG	0x02
 	field	LAST_SEG_DONE	0x01
 }
@@ -1478,14 +1477,6 @@ scratch_ram {
 		field	ENAUTOATNI	0x04
 		field	ENAUTOATNP	0x02
 	}
-
-	/*
-	 * Track whether the transfer byte count for
-	 * the current data phase is odd.
-	 */
-	DATA_COUNT_ODD {
-		size		1
-	}
 }
 
 scratch_ram {
diff --git a/sys/dev/aic7xxx/aic7xxx.seq b/sys/dev/aic7xxx/aic7xxx.seq
index 19d19d8ac13..332fff74d84 100644
--- a/sys/dev/aic7xxx/aic7xxx.seq
+++ b/sys/dev/aic7xxx/aic7xxx.seq
@@ -40,7 +40,7 @@
  * $FreeBSD$
  */
 
-VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.seq#54 $"
+VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.seq#55 $"
 PATCH_ARG_LIST = "struct ahc_softc *ahc"
 PREFIX = "ahc_"
 
@@ -437,7 +437,7 @@ select_out:
 	mov	SCBPTR, WAITING_SCBH;
 	mov	WAITING_SCBH,SCB_NEXT;
 	mov	SAVED_SCSIID, SCB_SCSIID;
-	mov	SAVED_LUN, SCB_LUN;
+	and	SAVED_LUN, LID, SCB_LUN;
 	call	set_transfer_settings;
 	if ((ahc->flags & AHC_TARGETROLE) != 0) {
 		test	SSTAT0, TARGET	jz initiator_select;
@@ -461,7 +461,7 @@ select_out:
 		/*
 		 * Start out with a simple identify message.
 		 */
-		or	SCB_LUN, MSG_IDENTIFYFLAG call target_outb;
+		or	SAVED_LUN, MSG_IDENTIFYFLAG call target_outb;
 
 		/*
 		 * If we are the result of a tagged command, send
@@ -768,16 +768,12 @@ idle_sg_avail:
 		/* Does the hardware have space for another SG entry? */
 		test	DFSTATUS, PRELOAD_AVAIL jz return;
 		bmov 	HADDR, CCSGRAM, 7;
-		test	HCNT[0], 0x1 jz . + 2;
-		xor	DATA_COUNT_ODD, 0x1;
 		bmov	SCB_RESIDUAL_DATACNT[3], CCSGRAM, 1;
 		if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
 			mov	SCB_RESIDUAL_DATACNT[3] call set_hhaddr;
 		}
 		call	sg_advance;
 		mov	SINDEX, SCB_RESIDUAL_SGPTR[0];
-		test	DATA_COUNT_ODD, 0x1 jz . + 2;
-		or	SINDEX, ODD_SEG;
 		test	SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz . + 2;
 		or	SINDEX, LAST_SEG;
 		mov	SG_CACHE_PRE, SINDEX;
@@ -875,7 +871,6 @@ data_phase_initialize:
 		call	calc_mwi_residual;
 	}
 	and	SCB_RESIDUAL_SGPTR[0], ~SG_FULL_RESID;
-	and	DATA_COUNT_ODD, 0x1, HCNT[0];
 
 	if ((ahc->features & AHC_ULTRA2) == 0) {
 		if ((ahc->features & AHC_CMD_CHAN) != 0) {
@@ -910,8 +905,6 @@ data_phase_inbounds:
 		mov	SINDEX, SCB_RESIDUAL_SGPTR[0];
 		test	SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz . + 2;
 		or	SINDEX, LAST_SEG;
-		test	DATA_COUNT_ODD, 0x1 jz . + 2;
-		or	SINDEX, ODD_SEG;
 		mov	SG_CACHE_PRE, SINDEX;
 		mov	DFCNTRL, DMAPARAMS;
 ultra2_dma_loop:
@@ -1006,10 +999,8 @@ sgptr_fixup:
 		adc	SCB_RESIDUAL_SGPTR[3], -1;
 sgptr_fixup_done:
 		and	SCB_RESIDUAL_SGPTR[0], SG_ADDR_MASK, SG_CACHE_SHADOW;
-		clr	DATA_COUNT_ODD;
-		test	SG_CACHE_SHADOW, ODD_SEG jz . + 2;
-		or	DATA_COUNT_ODD, 0x1;
-		clr	SCB_RESIDUAL_DATACNT[3]; /* We are not the last seg */
+		/* We are not the last seg */
+		and	SCB_RESIDUAL_DATACNT[3], ~SG_LAST_SEG;
 residuals_correct:
 		/*
 		 * Go ahead and shut down the DMA engine now.
@@ -1246,9 +1237,6 @@ sg_load_done:
 		} else {
 			call	set_stcnt_from_hcnt;
 		}
-		/* Track odd'ness */
-		test	HCNT[0], 0x1 jz . + 2;
-		xor	DATA_COUNT_ODD, 0x1;
 
 		if ((ahc->flags & AHC_TARGETROLE) != 0) {
 			test	SSTAT0, TARGET jnz data_phase_loop;
@@ -1350,7 +1338,7 @@ residual_update_done:
 		 */
 		test	DFCNTRL, DIRECTION jz target_ITloop;
 		test	SSTAT1, REQINIT	jnz .;
-		test	DATA_COUNT_ODD, 0x1 jz target_ITloop;
+		test	SCB_LUN, SCB_XFERLEN_ODD jz target_ITloop;
 		test	SCSIRATE, WIDEXFER jz target_ITloop;
 		/*
 		 * Issue an Ignore Wide Residue Message.
@@ -1510,7 +1498,7 @@ p_mesgout:
 	cmp	SINDEX, MSG_IDENTIFYFLAG jne p_mesgout_from_host;
 	test	SCB_CONTROL,MK_MESSAGE	jnz host_message_loop;
 p_mesgout_identify:
-	or	SINDEX, MSG_IDENTIFYFLAG|DISCENB, SCB_LUN;
+	or	SINDEX, MSG_IDENTIFYFLAG|DISCENB, SAVED_LUN;
 	test	SCB_CONTROL, DISCENB jnz . + 2;
 	and	SINDEX, ~DISCENB;
 /*
@@ -1587,7 +1575,7 @@ if ((ahc->features & AHC_WIDE) != 0) {
 	mvi	ARG_1	call inb_next;
 	cmp	ARG_1, 0x01 jne mesgin_reject;
 	test	SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz . + 2;
-	test	DATA_COUNT_ODD, 0x1	jz mesgin_done;
+	test	SCB_LUN, SCB_XFERLEN_ODD jnz mesgin_done;
 	mvi	IGN_WIDE_RES call set_seqint;
 	jmp	mesgin_done;
 }
@@ -1716,7 +1704,7 @@ mesgin_disconnect:
 	}
 	test	SCB_CONTROL, TAG_ENB jnz await_busfree;
 	mov	ARG_1, SCB_TAG;
-	mov	SAVED_LUN, SCB_LUN;
+	and	SAVED_LUN, LID, SCB_LUN;
 	mov	SCB_SCSIID	call set_busy_target;
 	jmp	await_busfree;
 
@@ -1859,7 +1847,7 @@ mesgin_identify:
 		 * at a time.  So, if the lun doesn't match, look
 		 * for a tag message.
 		 */
-		mov	A, SCB_LUN;
+		and	A, LID, SCB_LUN;
 		cmp	SAVED_LUN, A	je setup_SCB_id_lun_okay;
 		if ((ahc->flags & AHC_PAGESCBS) != 0) {
 			/*
@@ -1917,7 +1905,7 @@ setup_SCB:
 		or	SEQ_FLAGS, 0x8;
 	}
 setup_SCB_id_okay:
-	mov	A, SCB_LUN;
+	and	A, LID, SCB_LUN;
 	cmp	SAVED_LUN, A	jne not_found_cleanup_scb;
 setup_SCB_id_lun_okay:
 	if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
diff --git a/sys/dev/aic7xxx/aic7xxx_inline.h b/sys/dev/aic7xxx/aic7xxx_inline.h
index f066b8f8829..2cc8a17ed8b 100644
--- a/sys/dev/aic7xxx/aic7xxx_inline.h
+++ b/sys/dev/aic7xxx/aic7xxx_inline.h
@@ -37,7 +37,7 @@
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  *
- * $Id: //depot/aic7xxx/aic7xxx/aic7xxx_inline.h#42 $
+ * $Id: //depot/aic7xxx/aic7xxx/aic7xxx_inline.h#43 $
  *
  * $FreeBSD$
  */
@@ -454,6 +454,13 @@ ahc_queue_scb(struct ahc_softc *ahc, struct scb *scb)
 		panic("Attempt to queue invalid SCB tag %x:%x\n",
 		      scb->hscb->tag, scb->hscb->next);
 
+	/*
+	 * Setup data "oddness".
+	 */
+	scb->hscb->lun &= LID;
+	if (ahc_get_transfer_length(scb) & 0x1)
+		scb->hscb->lun |= SCB_XFERLEN_ODD;
+
 	/*
 	 * Keep a history of SCBs we've downloaded in the qinfifo.
 	 */