--- xorg-server-1.7.5.orig/hw/xfree86/os-support/linux/lnx_video.c	2010-02-16 01:24:23.000000000 +0100
+++ xorg-server-1.7.5/hw/xfree86/os-support/linux/lnx_video.c	2010-03-07 16:38:06.000000000 +0100
@@ -497,7 +497,7 @@ volatile unsigned char *ioBase = NULL;
 Bool
 xf86EnableIO(void)
 {
-#if defined(__powerpc__)
+#if defined(__powerpc__) || defined(__mips__)
 	int fd;
 	unsigned int ioBase_phys;
 #endif
@@ -537,6 +537,13 @@ xf86EnableIO(void)
 	ioperm(0x40,4,0); /* trap access to the timer chip */
 	ioperm(0x60,4,0); /* trap access to the keyboard controller */
 # endif
+#else
+	fd = open("/dev/mem", O_RDWR);
+	if (IOPortBase == NULL) {
+		IOPortBase = (volatile unsigned char *)mmap(0, 0x20000,
+			PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x1fd00000);
+	}
+	close(fd);
 #endif
 	ExtendedEnabled = TRUE;