asus/{p2b-x,p3b-f},intel/i440bx: Move mainboard_romstage_entry()

Change-Id: I3598f548c2d122906fda09c85b5a1c82b0da993b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38255
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/i440bx/romstage.c b/src/northbridge/intel/i440bx/romstage.c
new file mode 100644
index 0000000..1dee03a
--- /dev/null
+++ b/src/northbridge/intel/i440bx/romstage.c
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/romstage.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <southbridge/intel/i82371eb/i82371eb.h>
+#include <northbridge/intel/i440bx/raminit.h>
+
+void mainboard_romstage_entry(void)
+{
+	mainboard_enable_serial();
+	console_init();
+
+	i82371eb_early_init();
+
+	sdram_initialize();
+	cbmem_initialize_empty();
+}