if (nvram.version <= 4)
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
-@@ -57,6 +57,7 @@ void (*_dma_cache_wback)(unsigned long s
+@@ -58,6 +58,7 @@ void (*_dma_cache_wback)(unsigned long s
void (*_dma_cache_inv)(unsigned long start, unsigned long size);
EXPORT_SYMBOL(_dma_cache_wback_inv);