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

*** 76,87 ****
                  pdip = (A_TO_TRAN(ap))->tran_hba_dip;
  
                  /*
                   * 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-                  * ddi_iopb_alloc() is obsolete and we want more flexibility in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.
                   */
                  while (i_ddi_mem_alloc(pdip, &scsi_alloc_attr, datalen,
                      ((callback == SLEEP_FUNC) ? 1 : 0), 0, NULL,
                      &bp->b_un.b_addr, &rlen, NULL) != DDI_SUCCESS) {
                          if (callback == SLEEP_FUNC) {
--- 76,85 ----