SS_RXFIFO
writesl(ss->base + SS_RXFIFO, mi.addr + oi,
writesl(ss->base + SS_RXFIFO, ss->buf,
writesl(ss->base + SS_RXFIFO, mi.addr + oi, todo);
writesl(ss->base + SS_RXFIFO, op->buf,
writesl(ss->base + SS_RXFIFO, mi.addr + in_i, todo);
writesl(ss->base + SS_RXFIFO, op->buf, nwait);
writesl(ss->base + SS_RXFIFO, bf, j);