esm_bmc_ready
if (esm_bmc_ready(sc, ESM2_CTRL_REG, ESM2_TC_READY,
if (esm_bmc_ready(sc, ESM2_CTRL_REG, ESM2_TC_EC2HDB,
int esm_bmc_ready(struct esm_softc *, int, u_int8_t, u_int8_t, int);
if (esm_bmc_ready(sc, ESM2_CTRL_REG, ESM2_TC_ECBUSY, 0, 1) != 0) {