--- hw/xfree86/os-support/bus/linuxPci.c
+++ hw/xfree86/os-support/bus/linuxPci.c
@@ -493,6 +493,7 @@ xf86MapDomainMemory(int ScreenNum, int F
      * legacy_mem interface is unavailable.
      */
     if ((Base > 1024*1024) || ((fd = linuxOpenLegacy(dev, "legacy_mem")) < 0))
+    fallback:
 	return linuxMapPci(ScreenNum, Flags, dev, Base, Size,
 			   PCIIOC_MMAP_IS_MEM);
     else
@@ -501,6 +502,8 @@ xf86MapDomainMemory(int ScreenNum, int F
     if (fd >= 0)
 	close(fd);
     if (addr == NULL || addr == MAP_FAILED) {
+        if (errno == ENXIO)
+	    goto fallback;
 	perror("mmap failure");
 	FatalError("xf86MapDomainMem():  mmap() failure\n");
     }