Re: PCI MGA support (was Re: [Dri-devel] mga cvs changes)

[Ian R. <id...@us...>]

Alan Cox wrote:
> On Gwe, 2004-03-12 at 21:40, Ian Romanick wrote:
> 
>>MGADRIPciInit wouldn't be a complete duplication of MGADRIAgpInit 
>>because I don't intend to (initially) support PCIGART.  Even when 
>>PCIGART is supported, not all chips in the MGA family support it.  Is 
>>the PCI G450 the only one?
> 
> Is there any easy way to find out from the card itself. I've got a PCI
> 220 here. 

Dunno.

> The drivers I've touched which handle PCI bus (VIA, S3 (trying to
> ressurect it) and SIS6326 (buggy still)) all use their own memory
> allocators for the PCI side and don't go into PCIGART world. SiS
> supports only linear textures/buffers in main memory via PCI which is a
> problem to use because of the Linux memory allocator.

 From reading some other messages in the archives, I think the G200 and 
G400, at the very least, work that way.  That basically limits the 
driver to using 64k chunks, right?  I don't think that should be a 
problem for vertex data, command buffers, and texture uploads.  It just 
means you lose the ability to texture from PCI memory.  I'm willing to 
make that sacrifice ATM.