Introduction
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EPIA XFree86 TV-Out Driver
An alternative video driver
for VIA EPIA motherboards.
Version 0.1 released 20/12/2002
PLEASE NOTE - while this page
is still here in the hope that the driver might continue to be useful
for some people, I no longer have easy access to the neccesary hardware
to develop it any further.
WARNING:
This is highly experimental software - it is probably chock full of
bugs,
and due to its hardware-hitting nature, must be run as 'root'.
You
use this software entirely at your own risk - I will not be held
responsible
for any damage to your system or loss of data resulting from crashes
caused
by this driver.
Background
VIA's EPIA boards include a TV encoder capable of displaying several
different
resolutions, and filling the screen to varying degrees with overscan
control.
VIA have shown an encouraging level of enlightenment with regard to
producing
an XFree86 driver for this encoder, and have bowed to public pressure
in releasing
its source code. The advantage of such a release is that others
can
learn from it and improve it. That's what I have attempted to do
with
this driver.
What does it do?
The archive available for download below contains a modified Trident
XFree86
driver, specifically for machines using the VT8601 NorthBridge VT1621
TV Encoder.
Such machines include the EPIA-5000, EPIA-8000, Jetway B860T and
Lex
Light.
This driver contains the following improvements over VIA's version:
What doesn't it do?
This driver includes no support whatever
for the new EPIA-M series of motherboards - these have a completely
difference
chipset (albeit a similar TV Encoder), and source for its XFree86
driver doesn't
yet appear to be available.
Only the VIA VT1621 TV Encoder is supported,
unlike VIA's driver, which also
supports the CH7005C TV Encoder
Known problems:
In TV-Out mode, video overlays still don't always line up with the
window
- I am investigating ways of fixing this without just having a huge
table
of corrections.
Installation:
The XFree86 driver is provided both as source and binary.
Building the
Trident driver from source requires a full XFree86 source tree, so
you're
probably better off trying to use the binary driver, which is also
provided.
You need to find your existing trident_drv.o file, usually found in
/usr/X11R6/lib/modules/drivers/
and replace it with the version found in the tarball.
You might also need to edit your XFree86Config file, since the options
present
in the VIA Trident driver have been extended:
 Source and
binary (125k)
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