allow TTYS0_DIV to be set explicitly

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1334 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/config/Options.lb

@@ -395,6 +395,12 @@ define TTYS0_BAUD
 	export always
 	comment "Default baud rate for serial console"
 end
+define TTYS0_DIV
+	default none
+	format "%d"
+	export used
+	comment "Allow UART divisor to be set explicitly"
+end
 define TTYS0_LCS
 	default 0x3
 	format "0x%x"

src/console/uart8250_console.c

@@ -11,11 +11,12 @@
 #define TTYS0_BAUD 115200
 #endif
 
+#ifndef TTYS0_DIV
 #if ((115200%TTYS0_BAUD) != 0)
 #error Bad ttys0 baud rate
 #endif
-
 #define TTYS0_DIV	(115200/TTYS0_BAUD)
+#endif
 
 /* Line Control Settings */
 #ifndef TTYS0_LCS