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

@@ -341,13 +341,11 @@
         *datap = (caddr_t)0;
         bzero((caddr_t)&local, sizeof (struct buf));
 
         /*
          * 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-         * is obsolete and we want more flexibility in controlling the DMA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(pdip, &scsi_alloc_attr, datalen,
             ((func == SLEEP_FUNC) ? 1 : 0), 0, NULL, &local.b_un.b_addr, &rlen,
             NULL) != DDI_SUCCESS) {
                 return (pkt);