LinuxQuestions.org - Serial port module in kernel.

Hi,
I consulted a old thread which talked about this http://www.linuxquestions.org/questi...959/page2.html
I am doing an expermient with TDMA on wifi for which I need access to serial port so that I can log receiving data from Wifi.I figured if I can just have a RTS pin toggled on demand I can do my work.

Reading te post I first recompiled my kernel to modularize serial port.Now if I insmod and serial_core.ko and 8250.ko the serial mode starts working (I test using a loopback test) the dmesg at that time says
"Serial :8250/16550 driver ,4 ports IRQ sharing disbaled"
:serial8250.o: ttyS0 at MMIO 0x70006000 (irq=68) is a Xscale"
SO i assume the port address is 0x70006000
no here is the kernel code I have written.Right now I am just trying to make a square wave to see if I can toggle a pin on deman

Code:

Code:

#include <linux/module.h>

#include <linux/version.h>

#include <linux/types.h>

#include <linux/delay.h>

#include <asm/io.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/serial_reg.h>

#define MOD_NAME "serialmodule"

#define SERIAL_PORT_BASE 0x70006000





int __init enter_module(void)



{



        int n=0;

        int err;







 



 if(!request_region(SERIAL_PORT_BASE,8,MOD_NAME)) 



return 0;



else { 



printk("working");



        //turn off dlab



  outb((~(UART_LCR_DLAB)), SERIAL_PORT_BASE+UART_LCR);



        



        //disable interrupts



    outb((~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI)), SERIAL_PORT_BASE+UART_IER);



                        while(n<50)



        { 



                outb((~(UART_MCR_RTS)), SERIAL_PORT_BASE+UART_MCR);



                



                msleep(500);



                



                



                outb(UART_MCR_RTS, SERIAL_PORT_BASE+UART_MCR);



                msleep(500);



                n++;



        }



        return 0;}



}







void __exit cleanup_module1(void)



{ release_region(SERIAL_PORT_BASE, 8);



}







module_init(enter_module);



module_exit(cleanup_module1);







MODULE_LICENSE("GPL");



MODULE_AUTHOR("ARul Moondra_ISIS");



MODULE_DESCRIPTION("RTS SQAURE WAVE");

This never enters the "else" block also when I rmmod see in dmesg "trying to free nonexistent resource <000000070006000-00000000700060007>"

Can some one help me.I am using trimslice by compulab with kernel 3.1.10