Hi, I'm using /dev/gpiog, but I'm having problems. When i test: mask = 0xff << 8; ioctl(devfd, _IO(ETRAXGPIO_IOCTYPE, IO_CLRBITS),mask); sleep(1); ioctl(devfd, _IO(ETRAXGPIO_IOCTYPE, IO_SETBITS),mask); I don't see change in my lp0 ( i have connected led's). How can I change one bit of lp0? I'm using kernel 2.4.19. Thank. Antonio Redondo.