MCX_CMDQ_ADDR_LO
r = mcx_rd(sc, MCX_CMDQ_ADDR_LO);
mcx_wr(sc, MCX_CMDQ_ADDR_LO, MCX_DMA_DVA(&sc->sc_cmdq_mem));
mcx_bar(sc, MCX_CMDQ_ADDR_LO, sizeof(uint32_t),
mcx_wr(sc, MCX_CMDQ_ADDR_LO, MCX_DMA_DVA(&sc->sc_cmdq_mem) |
mcx_bar(sc, MCX_CMDQ_ADDR_LO, sizeof(uint64_t),
mcx_wr(sc, MCX_CMDQ_ADDR_LO, MCX_CMDQ_INTERFACE_DISABLED);