SYNCRFD
SYNCRFD(rfd, 0, RFD_PKT_OFFSET, DDI_DMA_SYNC_FORDEV);
SYNCRFD(rfd, RFD_CTL_OFFSET, 2, DDI_DMA_SYNC_FORDEV);
SYNCRFD(rfd, RFD_STS_OFFSET, 2, DDI_DMA_SYNC_FORKERNEL);
SYNCRFD(rfd, 0, 0, DDI_DMA_SYNC_FORKERNEL);