On Tue, Jan 14, 2003 at 11:51:53PM -0500, David Dawes scrawled: > On Tue, Jan 14, 2003 at 09:51:13AM -0800, Tim Roberts wrote: > >On Tue, 14 Jan 2003 07:51:10 -0500 (EST), Vladimir Dergachev wrote: > >> > >>One thing I don't understand about this is that this is an integrated > >>graphics chipset, right ? I.e. it uses part of system RAM for video RAM. > >>There is no code in radeon driver to deal with this yet. > > > >And there doesn't need to be. The allocation of video RAM from system RAM is > >done by the BIOS very early in boot time. The physical address of the video > >RAM gets stuffed into the PCI BAR register. The driver doesn't know or care > >whether that address is physically on an AGP bus, or in system RAM. > > > >The Savage driver is an example. The Savage/IX uses shared memory, whereas the > >Savage/MX has its own separate VRAM. The driver doesn't care at all. > > I guess the Intel integrated graphics chips (810/815, 830M, 845G) are > a little different then, with the agpgart kernel driver allowing additional > system memory to be mapped into the video address space at runtime.
There's also a BIOS option to do this early ... -- Daniel Stone <[EMAIL PROTECTED]> Developer, Trinity College, University of Melbourne
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