diff -urN linux.old/arch/mips/mm/init.c linux.dev/arch/mips/mm/init.c
--- linux.old/arch/mips/mm/init.c	2006-06-08 20:21:20.000000000 +0200
+++ linux.dev/arch/mips/mm/init.c	2006-06-08 20:19:40.000000000 +0200
@@ -149,7 +149,7 @@
 	kmap_init();
 #endif
 
-	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+	max_dma = virt_to_phys((char *) (256 * 1024 * 1024)) >> PAGE_SHIFT;
 	low = max_low_pfn;
 	high = highend_pfn;