+void __udelay(unsigned long);
+unsigned long get_timer(unsigned long);
+int vprintf(const char *, va_list);
+unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base);
+int strict_strtoul(const char *cp, unsigned int base, unsigned long *res);
+char *getenv (const char *name);
+int setenv (const char *varname, const char *varvalue);
+long simple_strtol(const char *cp, char **endp, unsigned int base);
+int strcmp(const char *cs, const char *ct);
+unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
+unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base);
+#if defined(CONFIG_CMD_I2C) && \
+ (!defined(CONFIG_DM_I2C) || defined(CONFIG_DM_I2C_COMPAT))