diff -ur ../xorg-build/lib/libpciaccess/src/linux_devmem.c libpciaccess/src/linux_devmem.c
--- ../xorg-build/lib/libpciaccess/src/linux_devmem.c	2008-11-25 06:42:15.000000000 -0500
+++ libpciaccess/src/linux_devmem.c	2008-12-05 00:34:34.000000000 -0500
@@ -125,7 +125,7 @@
 	size_t bytes;
 
 	for (bytes = 0; bytes < rom_size; /* empty */) {
-	    const ssize_t got = pread(fd, buffer, rom_size - bytes, 
+	    const ssize_t got = pread64(fd, buffer, rom_size - bytes, 
 				      rom_base + bytes);
 	    if (got == -1) {
 		err = errno;
diff -ur ../xorg-build/lib/libpciaccess/src/linux_sysfs.c libpciaccess/src/linux_sysfs.c
--- ../xorg-build/lib/libpciaccess/src/linux_sysfs.c	2008-11-25 06:42:15.000000000 -0500
+++ libpciaccess/src/linux_sysfs.c	2008-12-05 00:51:38.000000000 -0500
@@ -365,6 +365,10 @@
     write( fd, "0", 1 );
 
     close( fd );
+    if (total_bytes < rom_size) {
+        /* Failed to read entire ROM, falling back to /dev/mem  */
+        err = pci_device_linux_devmem_read_rom(dev, buffer);
+    }
     return err;
 }