--- secbuf.c    2008-02-02 02:30:41.000000000 +0100
+++ secbuf.c    2019-01-14 20:00:38.265565570 +0100
@@ -51,7 +51,8 @@
    */
   *((unsigned int*)p_mmap) = round_up;
   p_no_access_page = p_mmap;
-  vsf_sysutil_memprotect(p_no_access_page, page_size, kVSFSysUtilMapProtNone);
+  /* fix issue with MIPS SCACHE on MT7621 (and no sense to hide value of mapped block size) */
+  vsf_sysutil_memprotect(p_no_access_page, page_size, kVSFSysUtilMapProtReadOnly);

   p_mmap += page_size;
   if (page_offset)