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.
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