While the real-time clock updates its count, values may not be correctly
read or written. On reads, ensure the UIP bit is clear which guarantees
a minimum of 244 microseconds exists before the update begins. Writes
already avoid the problem by disabling the RTC count via the SET bit.
Change-Id: I39e34493113015d32582f1c280fafa9e97f43a40
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/17369
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
5a043fe08d