Re: [Linux-fbdev-devel] 2 pm3fb questions/problesm ...

[Petr V. <VAN...@vc...>]

On 19 Jun 01 at 16:48, Sven LUTHER wrote:
> 
> BTW, any idea about the 'initial garbage when using pm3fb' problem ?

And this is what? Do you mean that vgacon -> pm3fb switch during
bootup does not preserve contents of screen? Make sure that
on enter to register_framebuffer() pm3fb is in VGA mode, memory
is mapped at 0xB8000 and SEQ/GDC/CRTC are set for VGA text mode.
During register_framebuffer() vgacon reads VGA videoram, then
_set_var (I believe that implicitly through your console_switch) of 
your framebuffer is invoked, and screen is repainted using putcs...

So you should have some currcon variable in your fbinfo:

fbinfo.currcon = -1;
register_framebuffer(&fbinfo);
if (fbinfo.currcon == -1) {
   /* we are second head... */
   yourfb_set_var(.....);
}

and your fbinfo_select_console should do:

fbinfo.currcon = new_console;
yourfb_set_var(.....);

and all code which changes memory layout and enables/disables VGA emulation
should be executed only from inside yourfb_set_var and not before
call to register_framebuffer.
                                                Best regards,
                                                        Petr Vandrovec
                                                        van...@vc...