Add SDRAMPWR_4DIMM Kconfig option (not user-visible in menuconfig).

Each Intel 440BX board should select this option if it has 4 DIMM
slots on the PCB, and _not_ select it (it defaults to 'n') if it
has 3 DIMMs on the PCB.

Signed-off-by: Keith Hui <buurin@gmail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5204 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/northbridge/intel/i440bx/raminit.c

@@ -292,7 +292,11 @@ static const long register_values[] = {
 	 *         0 = 3 clocks of RAS# precharge
 	 *         1 = 2 clocks of RAS# precharge
 	 */
-	SDRAMC + 0, 0x00, 0x00,
+#if CONFIG_SDRAMPWR_4DIMM
+	SDRAMC + 0, 0x00, 0x10, /* The board has 4 DIMM slots. */
+#else
+	SDRAMC + 0, 0x00, 0x00, /* The board has 3 DIMM slots.*/
+#endif
 	SDRAMC + 1, 0x00, 0x00,
 
 	/* PGPOL - Paging Policy Register