--- sys/dev/pms/freebsd/driver/ini/src/agdef.h.orig
+++ sys/dev/pms/freebsd/driver/ini/src/agdef.h
@@ -62,7 +62,7 @@
 #define AGTIAPI_MAX_DEVICE_7H       256 /*Max devices per channel in 7H */
 #define AGTIAPI_MAX_DEVICE_8H       512 /*Max devices per channel in 8H*/
 #define AGTIAPI_MAX_CAM_Q_DEPTH     1024
-#define AGTIAPI_NSEGS               (btoc(maxphys) + 1)
+#define AGTIAPI_NSEGS               (MIN(btoc(maxphys), 64) + 1)
 /*
 ** Adapter specific defines 
 */
--- sys/dev/pms/freebsd/driver/ini/src/agtiapi.c.orig
+++ sys/dev/pms/freebsd/driver/ini/src/agtiapi.c
@@ -1834,7 +1834,7 @@
     cpi->max_target = maxTargets - 1;
     cpi->max_lun = AGTIAPI_MAX_LUN;
     /* Max supported I/O size, in bytes. */
-    cpi->maxio = ulmin(1024 * 1024, maxphys);
+    cpi->maxio = ctob(AGTIAPI_NSEGS - 1);
     cpi->initiator_id = 255;
     strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
     strlcpy(cpi->hba_vid, "PMC", HBA_IDLEN);
@@ -2629,9 +2629,11 @@
     {
       AGTIAPI_PRINTK("agtiapi_PrepareSGListCB: error status 0x%x\n", error);
       bus_dmamap_unload(pmcsc->buffer_dmat, pccb->CCB_dmamap);
-      bus_dmamap_destroy(pmcsc->buffer_dmat, pccb->CCB_dmamap);
       agtiapi_FreeCCB(pmcsc, pccb);
-      ccb->ccb_h.status = CAM_REQ_CMP;
+      if (error == EFBIG)
+        ccb->ccb_h.status = CAM_REQ_TOO_BIG;
+      else
+        ccb->ccb_h.status = CAM_REQ_CMP_ERR;
       xpt_done(ccb);
       return;
     }
@@ -2643,9 +2645,8 @@
                     " AGTIAPI_MAX_DMA_SEGS %d\n", 
                     nsegs, AGTIAPI_MAX_DMA_SEGS );
     bus_dmamap_unload(pmcsc->buffer_dmat, pccb->CCB_dmamap);
-    bus_dmamap_destroy(pmcsc->buffer_dmat, pccb->CCB_dmamap);
     agtiapi_FreeCCB(pmcsc, pccb);
-    ccb->ccb_h.status = CAM_REQ_CMP;
+    ccb->ccb_h.status = CAM_REQ_TOO_BIG;
     xpt_done(ccb);   
     return;
   }
@@ -3689,9 +3690,11 @@
       AGTIAPI_PRINTK( "agtiapi_PrepareSMPSGListCB: error status 0x%x\n",
                       error );
       bus_dmamap_unload( pmcsc->buffer_dmat, pccb->CCB_dmamap );
-      bus_dmamap_destroy( pmcsc->buffer_dmat, pccb->CCB_dmamap );
       agtiapi_FreeCCB( pmcsc, pccb );
-      ccb->ccb_h.status = CAM_REQ_CMP;
+      if (error == EFBIG)
+        ccb->ccb_h.status = CAM_REQ_TOO_BIG;
+      else
+        ccb->ccb_h.status = CAM_REQ_CMP_ERR;
       xpt_done( ccb );
       return;
     }
@@ -3703,9 +3706,8 @@
                     "AGTIAPI_MAX_DMA_SEGS %d\n",
                     nsegs, AGTIAPI_MAX_DMA_SEGS );
     bus_dmamap_unload( pmcsc->buffer_dmat, pccb->CCB_dmamap );
-    bus_dmamap_destroy( pmcsc->buffer_dmat, pccb->CCB_dmamap );
     agtiapi_FreeCCB( pmcsc, pccb );
-    ccb->ccb_h.status = CAM_REQ_CMP;
+    ccb->ccb_h.status = CAM_REQ_TOO_BIG;
     xpt_done( ccb );
     return;
   }
@@ -4410,7 +4412,7 @@
   if ((pccb = agtiapi_GetCCB(pmcsc)) == NULL)
   {
     AGTIAPI_PRINTK("agtiapi_QueueSMP: GetCCB ERROR\n");
-    ccb->ccb_h.status = CAM_REQ_CMP;
+    ccb->ccb_h.status = CAM_REQ_CMP_ERR;
     xpt_done(ccb);
     return tiBusy;
   }