Revert back the DMA_VALID bit used for spider. This breaks
support for spider !

We need a better solution for this on the long run, in order
to support multiple types of IOMMU. Unfortunately, AXON
seems to behave in similar ways to spider in this regard.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-2.6.16-rc1/arch/powerpc/platforms/cell/iommu.h
===================================================================
--- linux-2.6.16-rc1.orig/arch/powerpc/platforms/cell/iommu.h
+++ linux-2.6.16-rc1/arch/powerpc/platforms/cell/iommu.h
@@ -55,7 +55,7 @@ enum {
 
 	/* The high bit needs to be set on every DMA address,
 	   only 2GB are addressable */
-	CELL_DMA_VALID	  = 0x80000000,
+	CELL_DMA_VALID	  = 0x00000000,		/* removed for AXON -- saw */
 	CELL_DMA_MASK	  = 0x7fffffff,
 };
 

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