4630 clean stale references to ddi_iopb_alloc and ddi_iopb_free
4634 undocument scsi_hba_attach() and ddi_dma_lim(9s)

@@ -1048,13 +1048,11 @@
             >> dadkp->dad_secshf) << dadkp->dad_secshf;
 
         bp->b_un.b_addr = 0;
         /*
          * use i_ddi_mem_alloc() for now until we have an interface to allocate
-         * memory for DMA which doesn't require a DMA handle. ddi_iopb_alloc()
-         * is obsolete and we want more flexibility in controlling the DMA
-         * address constraints..
+         * memory for DMA which doesn't require a DMA handle.
          */
         if (i_ddi_mem_alloc((dadkp->dad_sd)->sd_dev, &dadk_alloc_attr,
             (size_t)iobp->b_pbytecnt, ((kmsflg == KM_SLEEP) ? 1 : 0), 0, NULL,
             &bp->b_un.b_addr, &rlen, NULL) != DDI_SUCCESS) {
                 freerbuf(bp);