Re: [Linux-fbdev-devel] no console switching

[Manousaridis A. <am...@in...>]

Thanks for you quick reply.

Geert Uytterhoeven wrote:
> On Tue, 11 Nov 2003, Manousaridis Angelos wrote:
> 
>>I am trying to implement a framebuffer device without console support. I 
>>want to display only graphics, no text at all.
>>
>>Is there a way to avoid the console take over?
> 
> Disable CONFIG_VT_CONSOLE.

I did that. there is no change.

>>I don't have the actuall graphics device yet, so I have created an 
>>initial version of the driver looking a lot like the vfb device.
>>I set the dispsw variable of the display structure to fbcon_dummy.
>>When I load the module I see this:
>>
>>fbcon_setup: No support for fontwidth 8
>>fbcon_setup: type 0 (aux 0, depth 8) not supported
> 
> That's harmless, and caused by fbcon_dummy.
> 
>>Console: switching to colour frame buffer device 80x30
>>fb0: Teralogic 751 frame buffer device
>>
>>The module count increases to 63 and I cannot unload the module.
> 
> Because the virtual console subsystem uses 63 virtual consoles by default, and
> increases the module counter for each of them.

In the register_fremabuffer routine, this is called for the first 
framebuffer that is registered:

  take_over_console(&fb_con, first_fb_vc, last_fb_vc, fbcon_is_default)

This is what I don't like. When that happens, I cannot free fb0.
There is a give_up_console function but it is never called.


>>If I comment this line causing the owner variable to be undefined, the 
>>module count does not increase and the module can be unloaded.
>>But It seems that the device is NOT unregistered. When I load the module 
> 
> 
> Your module_cleanup() routine must unregister your fb_info.
> 

It does call unregister_framebuffer, but it returns "device busy" 
because fb0 is used as the system console.

I want either to avoid this :
"Console: switching to colour frame buffer device 80x30"
(which means take_over_console will not be called)
or, if I can't do that, to be able to take back by first framebuffer 
(fb0) from the console, so that I can unregister it.

What am I missing here?

--
Manousaridis Angelos