PBA               687 dev/pci/if_em.c 	E1000_WRITE_REG(&sc->hw, PBA, pba);
PBA              1604 dev/pci/if_em.c 	rx_buffer_size = ((E1000_READ_REG(&sc->hw, PBA) & 0xffff) << 10 );
PBA               626 dev/pci/if_em_hw.c         E1000_WRITE_REG(hw, PBA, E1000_PBA_8K);