RTC_HDR_UPM
head->ch_cnflags |= RTC_HDR_UPM;
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {
if ((head->ch_cnflags & RTC_HDR_UPM) == 0) {