From: Stephen Wille Padnos <spadnos@sover.net>
To: Bodo Eggert <7eggert@gmx.de>
Cc: linux-kernel@vger.kernel.org, geert@linux-m68k.org
Subject: Re: HARDWARE: Open-Source-Friendly Graphics Cards -- Viable?
Date: Sun, 24 Oct 2004 21:44:49 -0400 [thread overview]
Message-ID: <417C5A91.40008@sover.net> (raw)
In-Reply-To: <Pine.LNX.4.58.0410232104510.3984@be1.lrz>
Bodo Eggert wrote:
>Geert Uytterhoeven wrote:
>
>
>> <>On Wed, 20 Oct 2004, Jon Smirl wrote:
>
>>>If you implement VGA you will be able to boot and work in any x86
>>>system without writing any code other than the BIOS.
>>>
>>>
>>Ugh... I prefer _not_ to have VGA compatibility.
>>
>>
>If you want to be able to see the BIOS, you'll need some legacy emulation,
>but it should be enough to implement MDA output.
>
>
Nope. The PC BIOS looks for "expansion ROMs", and calls initialization
routines in the ones it finds. It then expects to be able to call INT
10 to position the cursor and print text (and read the cursor position,
what's on screen, etc.). You could have a BIOS on a network card that
provides the necessary interrupt routines, but actually talks to a
remote X server for display functions. (yes - it might need to
advertise itself as a video device for this to work)
>Since some VGA cards used to depend on the MDA/CGA BIOS routines, most
>(all?) BIOS variants will implement all nescensary IO functions. You'll
>need some MDA registers for the cursor position (that don't even clash with
>EGA/VGA/CGA), 4K mapped memory at B000:0000 and a loop translating the text.
>
>
Right - all video cards provide these BIOS routines (including one the
one being considered here). They aren't in the system BIOS. (Not that
there are no broken BIOSes around, but strictly speaking, there is no
need at all for the system BIOS to know anything about the display card
being used)
- Steve
next prev parent reply other threads:[~2004-10-25 1:44 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-23 19:06 HARDWARE: Open-Source-Friendly Graphics Cards -- Viable? Bodo Eggert
2004-10-25 1:44 ` Stephen Wille Padnos [this message]
2004-10-25 8:23 ` Vojtech Pavlik
-- strict thread matches above, loose matches on Subject: below --
2004-11-17 14:35 Sid Boyce
2004-11-17 14:46 ` Chris Wedgwood
2004-11-23 13:47 ` Karel Kulhavy
2004-11-23 22:48 ` Timothy Miller
2004-11-24 1:22 ` Sid Boyce
[not found] <6.1.2.0.1.20041026082223.0231edd8@mail.javagear.com>
2004-10-26 15:44 ` Timothy Miller
2004-10-26 16:35 ` Jesper Juhl
2004-10-26 16:57 ` Jeff Garzik
2004-10-26 21:14 ` Helge Hafting
2004-10-26 21:41 ` Timothy Miller
2004-10-22 17:15 Stephen Lewis
2004-10-23 4:45 ` Gene Heskett
2004-10-23 7:06 ` Stephen Lewis
2004-10-22 10:31 John Ripley
2004-10-22 12:58 ` Moritz Muehlenhoff
2004-10-22 17:33 ` Timothy Miller
2004-10-22 3:47 Roy Butler
2004-10-22 17:04 ` Timothy Miller
2004-10-24 18:17 ` Mail Lists
2004-10-25 12:17 ` Bernd Eckenfels
2004-10-21 17:44 John Ripley
2004-10-21 18:26 ` Timothy Miller
2004-10-21 21:36 ` Greg Buchholz
2004-10-21 22:40 ` Timothy Miller
2004-10-21 23:25 ` Jon Smirl
2004-10-21 23:40 ` Greg Buchholz
2004-10-22 16:48 ` Timothy Miller
2004-10-22 16:50 ` Chris Friesen
2004-10-22 17:41 ` Timothy Miller
2004-10-25 23:10 ` Tonnerre
2004-10-26 0:32 ` Werner Almesberger
2004-10-22 15:59 ` Troy Benjegerdes
2004-10-21 17:08 Greg Buchholz
2004-10-22 2:18 ` Tim Connors
2004-10-21 15:54 John Ripley
2004-10-21 18:09 ` Timothy Miller
2004-10-21 21:32 ` Baruch Even
2004-10-25 23:30 ` Werner Almesberger
2004-10-21 4:48 Albert Cahalan
2004-10-21 16:19 ` Timothy Miller
2004-10-20 23:48 Timothy Miller
2004-10-21 0:30 ` J.A. Magallon
2004-10-21 0:47 ` Timothy Miller
2004-10-22 20:09 ` Geert Uytterhoeven
2004-10-21 1:25 ` Zan Lynx
2004-10-21 15:52 ` Timothy Miller
2004-10-20 22:02 Timothy Miller
2004-10-20 22:17 ` Andre Eisenbach
2004-10-21 1:31 ` Jon Valvatne
2004-10-21 16:09 ` Timothy Miller
2004-10-24 19:47 ` Pavel Machek
2004-10-20 22:26 ` David Lang
2004-10-21 14:46 ` Timothy Miller
2004-10-21 17:25 ` David Lang
2004-10-21 18:15 ` Timothy Miller
2004-10-21 18:32 ` Antonio Vargas
2004-10-22 9:53 ` Raphael Jacquot
2004-10-24 9:03 ` Tonnerre
2004-10-25 1:33 ` Stephen Wille Padnos
2004-10-25 1:48 ` Stephen Wille Padnos
2004-10-25 2:29 ` Gene Heskett
2004-10-22 10:16 ` Christian Leber
2004-10-22 17:31 ` Timothy Miller
2004-10-21 19:30 ` Kendall Bennett
2004-10-22 17:05 ` Tobias Diedrich
2004-10-22 17:12 ` Timothy Miller
2004-10-26 2:36 ` Dave Airlie
2004-10-26 3:55 ` Jon Smirl
2004-10-20 22:28 ` Jim Nelson
2004-10-21 14:51 ` Timothy Miller
2004-10-21 22:03 ` Jim Nelson
2004-10-20 22:29 ` Kasper Sandberg
2004-10-21 14:53 ` Timothy Miller
2004-10-21 15:06 ` Simon Braunschmidt
2004-10-21 18:00 ` Timothy Miller
2004-10-20 23:10 ` Alan Cox
2004-10-21 15:10 ` Timothy Miller
2004-10-21 15:25 ` Jon Smirl
2004-10-21 18:03 ` Timothy Miller
2004-10-21 15:32 ` Alan Cox
2004-10-21 19:30 ` Kendall Bennett
2004-10-22 17:15 ` Timothy Miller
2004-10-21 1:08 ` Jon Smirl
2004-10-21 1:11 ` Jon Smirl
2004-10-21 2:00 ` Stephen Wille Padnos
2004-10-21 16:08 ` Timothy Miller
2004-10-21 16:34 ` Stephen Wille Padnos
2004-10-21 23:38 ` Jan Knutar
2004-10-22 4:30 ` Jan Rychter
2004-10-22 17:00 ` Timothy Miller
2004-10-22 17:00 ` Chris Friesen
2004-10-22 18:47 ` Jeff Garzik
2004-10-22 19:22 ` Timothy Miller
2004-10-22 19:33 ` Jeff Garzik
2004-10-22 19:56 ` Timothy Miller
2004-10-22 20:43 ` Jeff Garzik
2004-10-22 20:27 ` Alan Cox
2004-10-23 17:20 ` Francois Romieu
2004-10-23 21:17 ` Alan Cox
2004-10-24 0:06 ` Francois Romieu
2004-10-22 20:51 ` Jeff Garzik
2004-10-22 19:32 ` Roland Dreier
2004-10-24 10:40 ` Helge Hafting
2004-10-25 15:39 ` Timothy Miller
2004-10-21 21:57 ` J.A. Magallon
2004-10-22 9:48 ` Raphael Jacquot
2004-10-21 20:23 ` "Fernando O. Korndörfer"
2004-10-22 9:02 ` Raphael Jacquot
2004-10-21 15:13 ` Timothy Miller
2004-10-21 15:36 ` Shaun Kruger
2004-10-21 18:05 ` Timothy Miller
2004-10-21 19:30 ` Kendall Bennett
2004-10-22 8:49 ` Adrian Cox
2004-10-22 20:10 ` Geert Uytterhoeven
2004-10-23 13:17 ` Adrian Cox
2004-10-22 20:10 ` Geert Uytterhoeven
2004-10-22 22:07 ` Timothy Miller
2004-10-24 10:45 ` Helge Hafting
2004-10-25 15:47 ` Timothy Miller
2004-10-28 9:07 ` Helge Hafting
2004-10-29 16:00 ` Timothy Miller
2004-10-21 2:29 ` Kurt Wall
2004-10-21 16:10 ` Timothy Miller
2004-10-21 16:22 ` Pascal Patry
2004-10-21 12:20 ` Adrian Bunk
2004-10-21 13:14 ` Simon Braunschmidt
2004-10-21 17:34 ` Jurriaan
2004-10-21 16:26 ` Timothy Miller
2004-10-21 17:42 ` Alan Cox
2004-10-21 19:09 ` Timothy Miller
2004-10-21 17:53 ` Tobias Diedrich
2004-10-21 23:02 ` Florian Schmidt
2004-10-24 1:04 ` Lee Revell
2004-10-22 1:08 ` Rene Herman
2004-10-23 5:40 ` Kevin Puetz
2004-10-23 17:02 ` Rene Herman
2004-10-23 22:19 ` Lee Revell
2004-10-24 11:10 ` Rene Herman
2004-10-22 10:57 ` Helge Hafting
2004-10-22 19:47 ` Giuseppe Bilotta
2004-10-22 20:15 ` Giuseppe Bilotta
2004-10-25 15:29 ` Tonnerre
2004-10-25 15:53 ` Timothy Miller
2004-10-25 16:32 ` Giuliano Pochini
2004-10-28 9:37 ` Helge Hafting
2004-10-28 11:40 ` Geert Uytterhoeven
2004-10-28 12:21 ` David Greaves
2004-10-29 16:04 ` Timothy Miller
2004-10-22 22:27 ` Clemens Schwaighofer
2004-10-23 14:36 ` Markus Törnqvist
2004-10-24 8:18 ` Tonnerre
2004-10-25 11:54 ` Stuart Longland
2004-10-25 16:38 ` Lars Roland
2004-10-25 17:08 ` Timothy Miller
2004-10-26 21:02 ` Helge Hafting
2004-10-26 21:38 ` Timothy Miller
2004-10-25 22:52 ` Tonnerre
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