--- zzzz-none-000/linux-2.6.32.61/include/linux/io.h	2013-06-10 09:43:48.000000000 +0000
+++ ar10-7272-687/linux-2.6.32.61/include/linux/io.h	2011-03-22 12:49:22.000000000 +0000
@@ -30,12 +30,20 @@
 #ifdef CONFIG_MMU
 int ioremap_page_range(unsigned long addr, unsigned long end,
 		       unsigned long phys_addr, pgprot_t prot);
+/*--------------------------------------------------------------------------------*\
+ * writep(un)protect virt_addr-area 
+ * ret: 0 ok
+\*--------------------------------------------------------------------------------*/
+int __io_remap_setwriteprotect(unsigned char *virt_addr, unsigned int len, unsigned int wrprotect);
 #else
 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 				     unsigned long phys_addr, pgprot_t prot)
 {
 	return 0;
 }
+static inline int __io_remap_setwriteprotect(unsigned char *virt_addr, unsigned int len, unsigned int wrprotect){
+	return 0;
+}
 #endif
 
 /*