RE: Incorporating Cirrus 7543 driver code into SVGA lib

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From: Marc E. Fiuczynski (mef@cs.washington.edu)
Date: Sat 09 Nov 2002 - 23:32:08 IST


I tried forcing the driver to recognise the 7543 as a 7548, which didn't
seem to work. It only recognized 512K of video ram, which doesn't allow me
to drive the thing at 800x600 with a decent resolution.

-----Original Message-----
From: Matan Ziv-Av [mailto:matan@svgalib.org]
Sent: Saturday, November 09, 2002 1:25 AM
To: Marc E. Fiuczynski
Cc: linux-svgalib@svgalib.org
Subject: Re: Incorporating Cirrus 7543 driver code into SVGA lib

On Fri, 8 Nov 2002, Marc E. Fiuczynski wrote:

> svgalib + zgv seem like the right solution. Now to the question the list
has
> likely been asked too often: has support for the Cirrus 7543 been added
> lately? I've searched the mailing list archives, I've used google on news

No work was done on the cirrus driver in a long time.
There seems to be support for the 7548, though. It is possible thsat
forcing the cirrus driver to recognise your card as a 7548 might be
enough to make it work.

> groups and the web, and I've peeked into the source release of both
svgalib
> 1.4.x and 1.9.x source release. It seems that I am out of luck, but I
wanted
> to check in with you first before I go about adding support myself.
>
> XFree86 3.3.6 has support for this chipset, as I have used it on the
> previously mentioned laptops and even peeked a bit at the code. I would be
> willing to attempt porting the code from XFree86. It seems that I could
just
> merge the 7543 support directly into svgalib. Unforunately, I have not
been
> able to locate a spec doc. for the Cirrus 7543 on the net. Anyone know
where
> I might find that?

You are a few years to late. All datasheets were available from cirrus'
weebsite. Unfortunately, they are not there now, and I did not download
the LCD controllers datasheets.
You idea of porting the code from the X driver to the svgalib driver
should work with no problem.


--
Matan Ziv-Av.                         matan@svgalib.org



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