Index: uspace/drv/bus/isa/isa.c
===================================================================
--- uspace/drv/bus/isa/isa.c	(revision 3c5b86c2ca53284195eca328c9cf627b285959a3)
+++ uspace/drv/bus/isa/isa.c	(revision 7e9e652913a5985f37d6cd1f38ebc993db6a8849)
@@ -78,6 +78,8 @@
 typedef struct {
 	fibril_mutex_t mutex;
-	uint16_t vendor_id;
-	uint16_t device_id;
+	uint16_t pci_vendor_id;
+	uint16_t pci_device_id;
+	uint8_t pci_class;
+	uint8_t pci_subclass;
 	ddf_dev_t *dev;
 	ddf_fun_t *fctl;
@@ -598,14 +600,19 @@
 static void isa_functions_add(isa_bus_t *isa)
 {
+#define BASE_CLASS_BRIDGE	0x06
+#define SUB_CLASS_BRIDGE_ISA	0x01
+	bool isa_bridge = ((isa->pci_class == BASE_CLASS_BRIDGE) &&
+	    (isa->pci_subclass == SUB_CLASS_BRIDGE_ISA));
+
 #define VENDOR_ID_SUN	0x108e
 #define DEVICE_ID_EBUS	0x1000
-	bool ebus = ((isa->vendor_id == VENDOR_ID_SUN) &&
-	    (isa->device_id == DEVICE_ID_EBUS));
-
-	const char *conf_path;
-	if (ebus)
-		conf_path = EBUS_CHILD_FUN_CONF_PATH; 
-	else
+	bool ebus = ((isa->pci_vendor_id == VENDOR_ID_SUN) &&
+	    (isa->pci_device_id == DEVICE_ID_EBUS));
+
+	const char *conf_path = NULL;
+	if (isa_bridge)
 		conf_path = ISA_CHILD_FUN_CONF_PATH;
+	else if (ebus)
+		conf_path = EBUS_CHILD_FUN_CONF_PATH;
 
 	char *conf = fun_conf_read(conf_path);
@@ -639,8 +646,14 @@
 	}
 
-	rc = pci_config_space_read_16(sess, PCI_VENDOR_ID, &isa->vendor_id);
+	rc = pci_config_space_read_16(sess, PCI_VENDOR_ID, &isa->pci_vendor_id);
 	if (rc != EOK)
 		return rc;
-	rc = pci_config_space_read_16(sess, PCI_DEVICE_ID, &isa->device_id);
+	rc = pci_config_space_read_16(sess, PCI_DEVICE_ID, &isa->pci_device_id);
+	if (rc != EOK)
+		return rc;
+	rc = pci_config_space_read_8(sess, PCI_BASE_CLASS, &isa->pci_class);
+	if (rc != EOK)
+		return rc;
+	rc = pci_config_space_read_8(sess, PCI_SUB_CLASS, &isa->pci_subclass);
 	if (rc != EOK)
 		return rc;