nb/intel/x4x/raminit: Change reset type on incomplete raminit reset

The checkreset() function checks if raminit previously
succeeded (pmcon2 bit7 == 0). If this is not the case it will issue a
hot reset (writing 0x6 to 0xcf9). On the next attempt to boot the
system BOOT_PATH_RESET path will be taken. This boot path can only
successfully initialize memory if the system was reset from a state
where raminit succeeded, which is not the case here.

This can be fixed by issuing a cold reset instead of a hot reset.

Change-Id: Idbcf034c3777a64cc3fb92dc603d10470a6c8cb6
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19506
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/x4x/raminit.c

@@ -330,7 +330,7 @@ static void checkreset_ddr2(int boot_path)
 		pci_write_config8(PCI_DEV(0, 0, 0), 0xf0, reg8 |  (1 << 2));
 
 		printk(BIOS_DEBUG, "Reset...\n");
-		outb(0x6, 0xcf9);
+		outb(0xe, 0xcf9);
 		asm ("hlt");
 	}
 	pmcon2 |= 0x80;