diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 3f4aa0c99ee4dccaf096330732887bc5be153f79..03f6338acc8fb7223e040078b1f196d28835c444 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -6,6 +6,7 @@ menu "Serial ATA (prod) and Parallel ATA (experimental) drivers"
 
 config ATA
 	tristate "ATA device support"
+	depends on BLOCK
 	depends on !(M32R || M68K) || BROKEN
 	depends on !SUN4 || BROKEN
 	select SCSI
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 25929123ffff3fdd6a927aa4113a232c2c074708..cef2e70d64f8d57d2e62bbec19a5fda752e05d40 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1041,7 +1041,7 @@ static void ahci_host_intr(struct ata_port *ap)
 	/* hmmm... a spurious interupt */
 
 	/* some devices send D2H reg with I bit set during NCQ command phase */
-	if (ap->sactive && status & PORT_IRQ_D2H_REG_FIS)
+	if (ap->sactive && (status & PORT_IRQ_D2H_REG_FIS))
 		return;
 
 	/* ignore interim PIO setup fis interrupts */
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 5719704eb0ee5a6d5699399cf2edb3b12f174f18..5250187ffce2a610f456e3814d019bc3a4b656b6 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -432,9 +432,9 @@ static const struct piix_map_db ich8_map_db = {
 	.present_shift = 8,
 	.map = {
 		/* PM   PS   SM   SS       MAP */
-		{  P0,  NA,  P1,  NA }, /* 00b (hardwired) */
+		{  P0,  P2,  P1,  P3 }, /* 00b (hardwired when in AHCI) */
 		{  RV,  RV,  RV,  RV },
-		{  RV,  RV,  RV,  RV }, /* 10b (never) */
+		{  IDE,  IDE,  NA,  NA }, /* 10b (IDE mode) */
 		{  RV,  RV,  RV,  RV },
 	},
 };
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 06daaa3736a2cbcd35efde2e377d0ad90cfc5d98..7645f2b30ccf2f35547025ed3f07e85700dcf9eb 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -981,6 +981,15 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
 		mask = (1 << 2) | (1 << 0);
 		if ((tmp8 & mask) != mask)
 			legacy_mode = (1 << 3);
+#if defined(CONFIG_NO_ATA_LEGACY)
+		/* Some platforms with PCI limits cannot address compat
+		   port space. In that case we punt if their firmware has
+		   left a device in compatibility mode */
+		if (legacy_mode) {
+			printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
+			return -EOPNOTSUPP;
+		}
+#endif
 	}
 
 	rc = pci_request_regions(pdev, DRV_NAME);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d0a7ad5ed518d3f6d314c4fede714676def3a26b..b03d5a340dc810723368d1cc4fbf73b703e9628d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -143,7 +143,7 @@ enum {
 	ATA_DFLAG_CFG_MASK	= (1 << 8) - 1,
 
 	ATA_DFLAG_PIO		= (1 << 8), /* device limited to PIO mode */
-	ATA_DFLAG_NCQ_OFF	= (1 << 9), /* devied limited to non-NCQ mode */
+	ATA_DFLAG_NCQ_OFF	= (1 << 9), /* device limited to non-NCQ mode */
 	ATA_DFLAG_SUSPENDED	= (1 << 10), /* device suspended */
 	ATA_DFLAG_INIT_MASK	= (1 << 16) - 1,