Hi I want to access to the GPIO on a Intel Atom N450. I have already read the kernel GPIO documentation http://www.mjmwired.net/kernel/Documentation/gpio.txt And by sysfs (/sys/class/gpio) echo 19 > export shows me an error of permisions Do i have to recompile the kernel like with this instructions ? http://elinux.org/GPIO I really would prefer to make a char driver , I already have one for OMAP technology, on that case in order to access to gpio is necessary to do this : #define PIN_LED GPIO_TO_PIN(6, 12) #define MUX_LED DA850_GPIO6_12 /*Free gpio */ gpio_free(PIN_LED); /*Configure in mux.h */ ret = davinci_cfg_reg (MUX_LED); if (ret<0) { return ret; } /*Ask permision to turn it on */ ret = gpio_request(PIN_LED, "led"); if (ret) { return ret; } /*Configure as out put */ gpio_direction_output(PIN_LED, 1); /*TURN ON */ gpio_set_value(PIN_LED, 1); But how can I do the GPIO_TO_PIN(6, 12) on Atom technology ? Thanks a lot for your help Regards Sincerely yours Victor Rodriguez