soc/intel/apollolake: cache the MMIO BIOS region

If the boot media is memory mapped temporarily mark it as write
protect MTRR type so that memory-mapped accesses are faster.

Depthcharge payload loading was sped up by 75ms using this.

BUG=chrome-os-partner:56656,chrome-os-partner:59682

Change-Id: Iba87a51a05559d81b8e00fa4f6824dacf7a661f5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17372
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

0 files changed, 0 insertions, 0 deletions