+struct nvram_accessor {
+ u8 (*read)(u8 reg);
+ void (*write)(u8 val, u8 reg);
+};
+
+extern u8 *mem_accessor_base;
+extern struct nvram_accessor *use_nvram, *use_mem;
+
+struct cb_cmos_option_table *get_system_option_table(void);
+void fix_options_checksum_with(const struct nvram_accessor *nvram);