In order to get better performance, map dram as cached after dram ready
in romstage.
BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui. Need a futher check after dram
calibration code ready.
Change-Id: Ie541fe08ee1d5b260abbabc0a5c18fb04e602b9c
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27304
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>