FD_BDCnt_SHIFT
int i, bd_count = (le32_to_cpu(fd->fd.FDCtl) & FD_BDCnt_MASK) >> FD_BDCnt_SHIFT;
txfd->fd.FDCtl = cpu_to_le32(FD_CownsFD | (1 << FD_BDCnt_SHIFT));
int bd_count = (fdctl & FD_BDCnt_MASK) >> FD_BDCnt_SHIFT;