nb/intel/sandybridge/raminit: Set REFIx9 according to spec

Set tREFIx9 to 8.9*tREFI/1024 as suggested in
xeon-e3-1200v3-vol-2-datasheet.pdf chapter 4.2.15 or
2nd-gen-core-family-mobile-vol-2-datasheet chapter 2.14.1.

Use the minimum value of REFI*8.9 and tRASmax as suggested by
3rd-gen-core-desktop-vol-2-datasheet.pdf chapter 2.13.9.

Change-Id: Ifd32a70f28aa75418030b0e4d1fc7d539a315f83
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/22259
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
1 file changed