The used RTC6110SA has issues to enter backup mode when the power supply
decreases too slow when the mainboard is turned off. Switch to backup
mode "primary cell" to make sure backup mode will be entered correctly
on power-off. In addition set IOCUTEN to minimize the backup current
consumption of the RTC.
Change-Id: I9733aa9f2981a25f6d42279eff0c4980e5eb5a5a
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/20413
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
c439109359