RGE_DTCCR_LO
RGE_WRITE_4(sc, RGE_DTCCR_LO, RGE_ADDR_LO(ss->paddr));
RGE_WRITE_BARRIER_4(sc, RGE_DTCCR_LO);
RGE_WRITE_4(sc, RGE_DTCCR_LO, RGE_ADDR_LO(ss->paddr) | RGE_DTCCR_CMD);
RGE_WRITE_BARRIER_4(sc, RGE_DTCCR_LO);
RGE_READ_BARRIER_4(sc, RGE_DTCCR_LO);
reg = RGE_READ_4(sc, RGE_DTCCR_LO);