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-rw-r--r--include/asm-m68k/io.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-m68k/io.h b/include/asm-m68k/io.h
index 50ea087..531f420 100644
--- a/include/asm-m68k/io.h
+++ b/include/asm-m68k/io.h
@@ -28,6 +28,10 @@
#include <asm/byteorder.h>
+#ifndef _IO_BASE
+#define _IO_BASE 0
+#endif
+
#define __raw_readb(addr) (*(volatile u8 *)(addr))
#define __raw_readw(addr) (*(volatile u16 *)(addr))
#define __raw_readl(addr) (*(volatile u32 *)(addr))