MIC-5345 is Advantech ATCA blade, it has RTC synchronization to make sure blade boot up with synced time.
Everyone who use MIC-5345 and need to use RTC data its OS
Please refer to FAQ for detail in ATCA RTC sync mechanism.
RTC Limitations on MIC-5345:
Because of RTC power design , there’s a limitation on MIC-5345D that BIOS time is ceased when blade is off (Power Cut).
MIC-5345D (Dual CPU) : RTC power source Super CAP
MIC-5345S (Single CPU) : RTC power source Battery
There's demonstration on RTC settings in attached file and came out an conclusion/workaround in below.
### BIOS only update SEL time when leaving BIOS setup menu, means update by command “hwclock -w” only update RTC but won’t trigger BIOS to overwrite IPMC time.
### There’re three workarounds for keeping MIC-5345D RTC time when RTC sync has been set to 0x02 or 0x04
(1) Set BIOS time at 1st boot --> Save & Exit
(2) Set IPMC SEL time in OS through command “ipmitool sel time set “MM/DD/YYYY hh:mm:ss””. The time will be updated in next boot
ex. Set SEL time (This command is only available when RTC sync is NOT set to 00h)
# ipmitool sel time set “10/11/2018 16:00:30” or
# ipmitool sel time set "`date '+%m/%d/%Y %H:%M:%S'`"
ex. Check SEL time
# ipmitool sel time get
(3) Add coin battery to treat MIC-5345D as MIC-5345S