diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 6a3bfef..21a7ca4 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -414,7 +414,7 @@
 	 */
 	.map = {
 		/* PM   PS   SM   SS       MAP */
-		{  P0,  P2,  RV,  RV }, /* 00b */
+		{  P0,  P2,  NA,  NA }, /* 00b */
 		{ IDE, IDE,  P1,  P3 }, /* 01b */
 		{  P0,  P2, IDE, IDE }, /* 10b */
 		{  RV,  RV,  RV,  RV },