--- zzzz-none-000/linux-3.10.107/arch/x86/boot/early_serial_console.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/x86/boot/early_serial_console.c	2021-02-04 17:41:59.000000000 +0000
@@ -2,8 +2,6 @@
 
 #define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */
 
-#define XMTRDY          0x20
-
 #define DLAB		0x80
 
 #define TXR             0       /*  Transmit register (WRITE) */
@@ -74,8 +72,8 @@
 			static const int bases[] = { 0x3f8, 0x2f8 };
 			int idx = 0;
 
-			if (!strncmp(arg + pos, "ttyS", 4))
-				pos += 4;
+			/* += strlen("ttyS"); */
+			pos += 4;
 
 			if (arg[pos++] == '1')
 				idx = 1;