Re: I'm going mad: /dev/tty - device not configured!

[James S. <jsi...@ac...>]

On Thu, 21 Sep 2000, Paolo Scaffardi wrote:

> Please, could you explain me differences between /dev/tty, /dev/tty0 and
> /dev/console?

/dev/console. 
    This is the system console. What display the kernel messages get
    sent to. 

/dev/tty 
    TTY the current process is attached to. Could be a VT, serial console,
    or even a modem.

/dev/tty0
    The current video terminal that is being displayed.

> I have an embedded linux box with a custom keyboard and a custom frame
> buffer. The keyboard driver sends scancodes to 'handle_scancode' in
> keyboard.c and it is not registered as console, or any type of device.

To get your keyboard to work with the console you need a function like

void __init xxxkbd_init_hw(void) {
}

Where xxx is what you want to call your keybaord driver. Take a look at
pckbd_init_hw. See in tty_io.c tty_init is called which calls kbd_init
which in turn calls kbd_init_hw which calls the specific xxxkbd_init_hw
function. This sets up your keyboard for the console system. Of course
you will need a little more than this to get the keyboard working right
but these are the key parts you need. Understand also the standard tree
only works with one keyboard at a time.
 
> The only problem is that when using other programs, like GII, that opens
> /dev/tty to access the keyboard, they dont work and report:
> 
>     /dev/tty - device not configured
>
> Who has to register /dev/tty? How could my keyboard be reached by /dev/tty?
> 
> I'm going mad... 8-(((

See above.

MS: (n) 1. A debilitating and surprisingly widespread affliction that
renders the sufferer barely able to perform the simplest task. 2. A disease.

James Simmons  [jsi...@li...]               ____/| 
fbdev/console/gfx developer                             \ o.O| 
http://www.linux-fbdev.org                               =(_)= 
http://linuxgfx.sourceforge.net                            U
http://linuxconsole.sourceforge.net