MFI_FRAME_SGL64
hdr->mfh_flags |= MFI_FRAME_IEEE_SGL | MFI_FRAME_SGL64;
hdr->mfh_flags |= MFI_FRAME_SGL64;
hdr->mfh_flags = htole16(MFI_FRAME_DIR_READ | MFI_FRAME_SGL64);