Serial support

Index: linux-2.6.25-source/drivers/serial/Kconfig
===================================================================
--- linux-2.6.25-source.orig/drivers/serial/Kconfig
+++ linux-2.6.25-source/drivers/serial/Kconfig
@@ -1353,3 +1353,15 @@
 	  Support for Console on SC2681/SC2692 serial ports.
 
 endmenu
+
+config SERIAL_COOPERATIVE
+	bool "coLinux serial device support"
+	depends on COOPERATIVE
+	default y
+	help
+	  say Y, if you have colinux
+
+config SERIAL_COOPERATIVE_CONSOLE
+	bool "coLinux serial console support"
+	depends on SERIAL_COOPERATIVE=y
+	select SERIAL_CORE_CONSOLE
Index: linux-2.6.25-source/drivers/serial/Makefile
===================================================================
--- linux-2.6.25-source.orig/drivers/serial/Makefile
+++ linux-2.6.25-source/drivers/serial/Makefile
@@ -67,3 +67,4 @@
 obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
 obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
 obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
+obj-$(CONFIG_SERIAL_COOPERATIVE) += coserial.o
Index: linux-2.6.25-source/drivers/serial/coserial.c
===================================================================
--- linux-2.6.25-source.orig/drivers/serial/coserial.c
+++ linux-2.6.25-source/drivers/serial/coserial.c
@@ -170,11 +170,17 @@
 {
 }
 
+static int cocd_chars_in_buffer(struct tty_struct *tty)
+{
+	return 0;
+}
+
 static struct tty_operations cocd_ops = {
 	.open = cocd_open,
 	.close = cocd_close,
 	.write = cocd_write,
 	.write_room = cocd_write_room,
+	.chars_in_buffer = cocd_chars_in_buffer,
 	.set_termios = cocd_set_termios,
 };