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

[Romain D. <do...@ir...>]

Petr Vandrovec wrote:

> So you should not have garbage problem on your machine.

I dont, but Sven Luther is plagued with a x86 box :-)

> Then you cannot take over vgacon...

So, in theory, neither do pm2fb and skeletonfb ?

I think then that skeletonfb should be flagged as such,
and all hardware driver that are non-VGA aware also.
(if it's already documented somewhere, apology,
I'm used to ignore everything that's labelled VGA :-)

> Only thing you can do is read read first and last console from
> video=vc: kernel parameter, and then at the beginning of your
> code you can call con_save_screen for all these terminals you
> are taking over. Then replace console's con_save_screen handler
> with NULL. But it is very dangerous, incompatible and so on...

I haven't ever used any of this stuff, so I guess it's
really (supposed to be) handled by fbgen or fbcon...

> It is much better just restore GDC/SEQ/CRTC state (you need
> to restore only registers needed for proper reading characters
> from videoram, ~10 registers) to their values on enter to your
> driver just before you do call to register_framebuffer().

Given I understand almost nothing in those bits, I assume it's
the VGA cruft I don't want to understand :-)

-- 
DOLBEAU Romain               | l'histoire est entierement vraie, puisque
ENS Cachan / Ker Lann        |     je l'ai imaginee d'un bout a l'autre
do...@ir...             |           -- Boris Vian