northbridge/intel/x4x: Native raminit

Passes memtest86+ with either one or two sticks of 2GB ram
but memory map needs a hole at 0xa0000000 to 0xc0000000

Change-Id: Ib34d862cb48b49c054a505fffcba1c17aeb39436
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/11307
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/northbridge/intel/x4x/Makefile.inc b/src/northbridge/intel/x4x/Makefile.inc
index 8d1247e..34d9b0f 100644
--- a/src/northbridge/intel/x4x/Makefile.inc
+++ b/src/northbridge/intel/x4x/Makefile.inc
@@ -17,6 +17,8 @@
 ifeq ($(CONFIG_NORTHBRIDGE_INTEL_X4X),y)
 
 romstage-y += early_init.c
+romstage-y += raminit.c
+romstage-y += raminit_ddr2.c
 romstage-y += ram_calc.c
 
 ramstage-y += acpi.c