BGE_MBX_RX_JUMBO_PROD_LO
bge_writembx(sc, BGE_MBX_RX_JUMBO_PROD_LO, BGE_JUMBO_RX_RING_CNT - 1);
bge_writembx(sc, BGE_MBX_RX_JUMBO_PROD_LO, 0);
bge_writembx(sc, BGE_MBX_RX_JUMBO_PROD_LO, (sc->bge_jumbo +