nb/intel/x4x: Change memory layout to improve MTRR
This change also makes sure that the sum the uma regions (TSEG, GSM,
GSM) is 4MiB aligned. This is needed to avoid cbmem_top floating between
2 usable ram region, since cbmem_top is aligned 4MiB down to easy MTRR
setup for ramstage. At least tianocore requires this and fails to boot
Better MTRR are achieved by making the memory 'hole' till 4GiB exactly
This code mimics how it is done in nb/intel/gm45 and achieves similar
TSEG is enabled and set to 8M since this makes it easier to reuse the
common smm setup / parallel mp code and makes it possible to cache the
ramstage in there like how it's done on newer targets.
TESTED on Intel DG43GT.
Signed-off-by: Arthur Heymans <email@example.com>
Tested-by: build bot (Jenkins) <firstname.lastname@example.org>
Reviewed-by: Nico Huber <email@example.com>
4 files changed