add second tty to initab again. kernel patch verified to work on asus wl500gx.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1995 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/default/etc/inittab

@@ -1,3 +1,4 @@
 ::sysinit:/etc/init.d/rcS
 ::shutdown:/sbin/halt
 tts/0::askfirst:/bin/ash --login
+tts/1::askfirst:/bin/ash --login

target/linux/linux-2.4/patches/generic/210-fix-irq-serial.patch

@@ -0,0 +1,21 @@
+--- linux-2.4.30/drivers/char/serial.c	2005-06-29 20:44:46.000000000 +0200
++++ linux-2.4.30.serial/drivers/char/serial.c	2005-06-29 21:15:12.000000000 +0200
+@@ -5455,18 +5455,6 @@
+ 		       sizeof(struct rs_multiport_struct));
+ #endif
+ 	}
+-#ifdef CONFIG_SERIAL_CONSOLE
+-	/*
+-	 *	The interrupt of the serial console port
+-	 *	can't be shared.
+-	 */
+-	if (sercons.flags & CON_CONSDEV) {
+-		for(i = 0; i < NR_PORTS; i++)
+-			if (i != sercons.index &&
+-			    rs_table[i].irq == rs_table[sercons.index].irq)
+-				rs_table[i].irq = 0;
+-	}
+-#endif
+ 	show_serial_version();
+ 
+ 	/* Initialize the tty_driver structure */