On Sun, 20 Aug 2000, Michael Levinger wrote:
> I finally got a Diamond SiS 6326 card to work under RedHat, after
> observing it works well under Mandrake. It seems the linux kernel(s)
> recognize only the first 4MB of this card's RAM (Diamon says the card has
> 8MB RAM) and thus you need tospecify 4MB under Xconfigurator. I suppose
> this is the way that Diamond configures their AGP shared memory stuff, and
> it seems LINUX is not too keen on those tricks. If someone knows more
> about this, please enlighten me.
You are wrong about this - the card does have 8MB of ram. The problem
is that the chipset itself was only designed for 4MB, so some things (for
example the cursor shape) can only reside in the first 4MB. This means
that the driver needs to order the frame buffer/pixmap cache/cursor/etc
in a way that would keep all things that need to be in the low 4MB. The
author of the driver chose not to do that, so the only solution is to
limit all the driver access to 4MB. Other chipsets have similar problem
(for example i740).
--
Matan Ziv-Av [EMAIL PROTECTED]
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