CMD_ENTRIES
bzero(&ld->txp_cmdring, sizeof(struct txp_cmd_desc) * CMD_ENTRIES);
boot->br_cmd_siz = CMD_ENTRIES * sizeof(struct txp_cmd_desc);
sc->sc_cmdring.size = CMD_ENTRIES * sizeof(struct txp_cmd_desc);
boot->br_resp_siz = CMD_ENTRIES * sizeof(struct txp_rsp_desc);
struct txp_cmd_desc txp_cmdring[CMD_ENTRIES];