diff --git a/src/southbridge/intel/i82801jx/bootblock.c b/src/southbridge/intel/i82801jx/bootblock.c
index fb2d5337b3..01faef34af 100644
--- a/src/southbridge/intel/i82801jx/bootblock.c
+++ b/src/southbridge/intel/i82801jx/bootblock.c
@@ -36,4 +36,7 @@ static void bootblock_southbridge_init(void)
 	/* Enable RCBA */
 	pci_write_config32(PCI_DEV(0, 0x1f, 0), RCBA,
 			(uintptr_t)DEFAULT_RCBA | 1);
+
+	/* Enable upper 128bytes of CMOS. */
+	RCBA32(0x3400) = (1 << 2);
 }