KCS_IBF
while (bmc_read(sc, _KCS_STATUS_REGISTER) & KCS_IBF)
return (kcs_wait(sc, KCS_IBF, 0, "write_cmd"));
return (kcs_wait(sc, KCS_IBF, 0, "write_data"));
sts = kcs_wait(sc, KCS_IBF | KCS_OBF, KCS_OBF, "read_data");
sts = kcs_wait(sc, KCS_IBF, 0, "recv");
printf(" IBF: %2x\n", v & KCS_IBF);