Actually,
I've just examined the code for reading on alpha, and regardless of
a Jensen or other type of alpha it's always the same for a 32bit read.
So can you reverse your patch and try this....
Alan.
Index: r200_screen.c
===================================================================
RCS file: /X11R6/x-cvs/xc/lib/GL/mesa/src/drv/r200/r200_screen.c,v
retrieving revision 1.6
diff -u -r1.6 r200_screen.c
--- r200_screen.c 2 Dec 2003 13:02:39 -0000 1.6
+++ r200_screen.c 11 Dec 2003 00:53:47 -0000
@@ -65,6 +65,18 @@
#define PCI_CHIP_RV200_QW 0x5157 /* Radeon 7500 - not an R200 at all */
#endif
+#ifdef __alpha__
+
+#define mem_barrier() __asm__ __volatile__("mb" : : : "memory")
+
+int
+xf86ReadMmio32(pointer Base, register unsigned long Offset)
+{
+ mem_barrier();
+ return *(volatile CARD32*)((unsigned long)Base+(Offset));
+}
+#endif
+
static r200ScreenPtr __r200Screen;
static int getSwapInfo( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo );
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