NV_ADMA_CPB_COUNT
writew(0, mmio + NV_ADMA_CPB_COUNT);
writew(0, mmio + NV_ADMA_CPB_COUNT);
writew(0, mmio + NV_ADMA_CPB_COUNT);
u8 cpb_count = readb(mmio + NV_ADMA_CPB_COUNT);
writew(0, mmio + NV_ADMA_CPB_COUNT);