[PATCH] AMD64 On-CPU GART support + more

Jung-uk Kim jkim at niksun.com
Mon Jun 14 21:22:15 GMT 2004

On Monday 14 June 2004 04:46 pm, Jung-uk Kim wrote:
> Since the latest DRM is imported, I made my AMD64 on-CPU GART[1]
> working (patch attached).  This driver has some ugliness because of
> its nature: driver is for AGP bridge but directly touches north
> bridge registers (of multiple north bridges if you have multiple
> CPUs).  Ideally we can attach child driver here for each bridge but
> it is just a part of its functions so that I didn't want to create
> a full-blown driver.  The second ugliness comes from the agp_sis.c
> and agp_via.c.  They fall back to 'generic host to PCI bridge' if
> it is not supported but it finds a bridge.  I believe this has to
> be removed.  The kludge is 'AGP_AMD64_GART' in kernel
> configuration. This kludge can be removed when the 'fallback'
> match/probe is removed.  For now, 'AGP_AMD64_GART' is required to
> test this driver. If anyone is interested, please cleanup/fix them.
> :-(

Oops, agp_via.c has a bad merge.  Sorry.

Jung-uk Kim

> It's tested with Via K8T800 (both FreeBSD/i386 and FreeBSD/amd64)
> but it should work with other bridges/tunnels.  XFree86 snapshot
> (after Mesa 6.1 import) + DRI snapshot worked fine with MGA 400 and
> Radeon RV280 in FreeBSD/i386.  In FreeBSD/amd64, MGA 400 works but
> Radeon RV280 doesn't work but I believe it's DRM/DRI's problem, i.
> e., Radeon SAREA handles.
> Cheers,
> Jung-uk Kim
> [1] BIOS and Kernel Developer's Guide for AMD Athlon? 64 and AMD
> Opteron(tm) Processors (3.6.12-15)
> http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_
> * PS: I think the current agp_via.c doesn't support K8T800 or other
> AGP v3 bridges correctly.  If anyone is interested, let me know.
> ;-)

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