--- a/arch/mips/include/asm/mach-ar7/spaces.h
+++ b/arch/mips/include/asm/mach-ar7/spaces.h
@@ -20,6 +20,8 @@
 #define UNCAC_BASE	_AC(0xb4000000, UL)	/* 0xa0000000 + PHYS_OFFSET */
 #define IO_BASE		UNCAC_BASE
 
+#define HIGHMEM_START	_AC(0x20000000, UL)
+
 #include <asm/mach-generic/spaces.h>
 
 #endif /* __ASM_AR7_SPACES_H */