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Re: Subject: Re: [Qemu-devel] VGA BIOS source code

From: Vladimir N. Oleynik
Subject: Re: Subject: Re: [Qemu-devel] VGA BIOS source code
Date: Wed, 02 Jun 2004 15:41:34 +0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040117


> The VMware driver idea is just an extension of it to add some
> acceleration primitives, and of course it is much more complicated.

The Vmware driver more simples of Bocsh VBE really.
The Bochs VBE have banking video memory and used standart VGA registers
for control.
The Vmware chip have framebufer only, don`t control by VGA-registers
and its "acceleration primitives" may be switch off by capatibiles mask
(to 0).
But Vmware chip is PCI only.

> Adding real hardware support (such as a Cirrus Logic VGA card) will also
> be more complicated than the Bochs VESA VBE layer.

The Cirrus Logic chips have very very hard logic for emulation:
very many bits tangled expressions :-(


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