SATA_ATAPI_MAX_BYTES_PER_DRQ
nv_put8(cmdhdl, nvp->nvp_hcyl, SATA_ATAPI_MAX_BYTES_PER_DRQ >> 8);
nv_put8(cmdhdl, nvp->nvp_lcyl, SATA_ATAPI_MAX_BYTES_PER_DRQ & 0xff);
scmd->satacmd_lba_mid_lsb = (uint8_t)SATA_ATAPI_MAX_BYTES_PER_DRQ;
(uint8_t)(SATA_ATAPI_MAX_BYTES_PER_DRQ >> 8);