Index: uspace/drv/bus/isa/isa.c
===================================================================
--- uspace/drv/bus/isa/isa.c	(revision 6dbc500575fd3e95d06574770eed576843ec89aa)
+++ uspace/drv/bus/isa/isa.c	(revision f18d01b62077976f96e7a6debddd5a6a217d2d37)
@@ -67,4 +67,5 @@
 
 #include <device/hw_res.h>
+#include <device/pio_window.h>
 
 #include "i8237.h"
@@ -79,4 +80,5 @@
 	ddf_dev_t *dev;
 	ddf_fun_t *fctl;
+	pio_window_t pio_win;
 	list_t functions;
 } isa_bus_t;
@@ -405,7 +407,10 @@
 	hw_resource_t *resources = fun->hw_resources.resources;
 
+	isa_bus_t *isa = isa_bus(ddf_fun_get_dev(fun->fnode));
+
 	if (count < ISA_MAX_HW_RES) {
 		resources[count].type = IO_RANGE;
 		resources[count].res.io_range.address = addr;
+		resources[count].res.io_range.address += isa->pio_win.io.base;
 		resources[count].res.io_range.size = len;
 		resources[count].res.io_range.endianness = LITTLE_ENDIAN;
@@ -604,4 +609,7 @@
 static int isa_dev_add(ddf_dev_t *dev)
 {
+	async_sess_t *sess;
+	int rc;
+
 	ddf_msg(LVL_DEBUG, "isa_dev_add, device handle = %d",
 	    (int) ddf_dev_get_handle(dev));
@@ -614,4 +622,18 @@
 	isa->dev = dev;
 	list_initialize(&isa->functions);
+
+	sess = ddf_dev_parent_sess_create(dev, EXCHANGE_SERIALIZE);
+	if (sess == NULL) {
+		ddf_msg(LVL_ERROR, "isa_dev_add failed to connect to the "
+		    "parent driver.");
+		return ENOENT;
+	}
+
+	rc = pio_window_get(sess, &isa->pio_win);
+	if (rc != EOK) {
+		ddf_msg(LVL_ERROR, "isa_dev_add failed to get PIO window "
+		    "for the device.");
+		return rc;
+	}	
 
 	/* Make the bus device more visible. Does not do anything. */