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-rw-r--r--include/asm-ppc/io.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-ppc/io.h b/include/asm-ppc/io.h
index 03289bc..11dfa1c 100644
--- a/include/asm-ppc/io.h
+++ b/include/asm-ppc/io.h
@@ -13,6 +13,9 @@
#define SIO_CONFIG_RA 0x398
#define SIO_CONFIG_RD 0x399
+#ifndef _IO_BASE
+#define _IO_BASE 0
+#endif
#define readb(addr) in_8((volatile u8 *)(addr))
#define writeb(b,addr) out_8((volatile u8 *)(addr), (b))