--- zzzz-none-000/linux-2.6.32.61/arch/mips/include/asm/mach-generic/dma-coherence.h	2013-06-10 09:43:48.000000000 +0000
+++ ar9-7330-650/linux-2.6.32.61/arch/mips/include/asm/mach-generic/dma-coherence.h	2011-07-20 07:23:51.000000000 +0000
@@ -68,4 +68,12 @@
 #endif
 }
 
+static inline int plat_addr_is_coherent(unsigned long addr)
+{
+    if((addr & 0xE0000000) == 0xA0000000) {
+        return 1;
+    }
+	return 0;
+}
+
 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */