--- zzzz-none-000/linux-3.10.107/arch/mips/include/asm/setup.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mips/include/asm/setup.h	2021-02-04 17:41:59.000000000 +0000
@@ -5,6 +5,14 @@
 
 extern void setup_early_printk(void);
 
+#ifdef CONFIG_EARLY_PRINTK_8250
+extern void setup_8250_early_printk_port(unsigned long base,
+	unsigned int reg_shift, unsigned int timeout);
+#else
+static inline void setup_8250_early_printk_port(unsigned long base,
+	unsigned int reg_shift, unsigned int timeout) {}
+#endif
+
 extern void set_handler(unsigned long offset, void *addr, unsigned long len);
 extern void set_uncached_handler(unsigned long offset, void *addr, unsigned long len);