SCF_SG
scb->flags &= ~(SCF_SG | SCF_DIR); /* for xfer_data_in */
if (scb->flags & SCF_SG) {
if (scb->flags & SCF_SG) { /* S/G xfer */
if (scb->flags & SCF_SG) { /* S/G xfer */
cblk->flags |= SCF_SG; /* Turn on SG list flag */