From: cinap_lenrek@gmx.de
To: 9front@googlegroups.com
Subject: Re: vga
Date: Wed, 11 Jul 2012 19:59:26 +0200 [thread overview]
Message-ID: <8995d16287a898fedf93707fe2eb4455@rei2.9hal> (raw)
In-Reply-To: <dc9e8f9d59c0ebc8706404054a93587d@sp.inri.net>
-m vesa is just a hack to force the vesa driver. -m is
really the monitor to use from vgadb. normally, aux/vga
will try to determine the type of graphics card from
snooping the vga bios (looked up in vgadb) and then run
device specific driver code to set the desired video mode.
vgadb basicly matches some strings in the vga bios and lets
you coose and you parametrize the driver.
realemu is only used for vesa. native graphics driver doesnt
need to run vga bios code. native driver just programs the
various hardware registers to set the desired video mode and
then activates the kernel part of the video driver for stuff
like hardware bliting (acceleration), hardware cursors ect...
(if the driver supports that)
so using video without vesa means you need a graphics card
that plan9 has native drivers for (and some plumbing in
vgadb so it gets activated for your specific card... or
you need to port / write a driver for it. vesa is kind of a
universal driver that doesnt know at all how to program the
hardware, but just runs some code stored in the vga bios under
the supervision of realemu passing thru memory and register
reads/writes to the real hardware.
--
cinap
next prev parent reply other threads:[~2012-07-11 18:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-11 14:52 vga sl
2012-07-11 17:59 ` cinap_lenrek [this message]
2012-07-11 18:29 ` vga sl
2012-07-11 18:06 ` vga cinap_lenrek
2012-07-11 18:30 ` vga sl
2012-07-11 23:38 ` vga cinap_lenrek
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