HFCUSB_B1_RX
if ((channel == HFC_CHAN_B1) && (hw->fifos[HFCUSB_B1_RX].active))
start_isoc_chain(hw->fifos + HFCUSB_B1_RX,
if ((channel == HFC_CHAN_B1) && (!hw->fifos[HFCUSB_B1_RX].active))
hw->fifos[HFCUSB_B1_RX].bch = &hw->bch[0];