Date: Fri, 21 May 2004 02:09:30 -0600 From: Scott Long <scottl@freebsd.org> To: Jung-uk Kim <jkim@niksun.com> Cc: freebsd-current@freebsd.org Subject: Re: Test your agp(4) before blaming on DRM/DRI! Message-ID: <40ADB93A.4020504@freebsd.org> In-Reply-To: <200405181244.28716.jkim@niksun.com> References: <200405181244.28716.jkim@niksun.com>
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Jung-uk Kim wrote: > I was trying to make my Intel i815 and VIA K8T800 chipsets working > with agp(4) and I found that there were number of issues in the > driver. These issues were mainly from adding PCI IDs blindly without > verifying proper documentation. On top of that, some drivers do not > care whether the bridge is supported or not and just attach as > 'generic' bridge, e. g., agp_sis.c and agp_via.c. This gives users > false hope and I believe this is wrong. > > I found the following from DRI website: > > http://dri.sourceforge.net/res/testgart.c > > and SuSE Linux had little newer package: > > http://www.suse.de/us/private/products/suse_linux/prof/packages_professional/testgart.html > > I modified SuSE's to work with FreeBSD. Test your GART before blaming > on DRM/DRI! If aperture size is reported differently from BIOS > setting, that is not supported correctly, e. g., i815 - different > aperture size encoding and registers. If writeback test fails, > that's more serious problem, e. g., K8T800 - doesn't work at all for > me. > > BTW, you have to unload your drm driver (or recompile kernel if you > compiled it in) before you test agp. > > I hope this helps many confused users. > > Cheers, > > Jung-uk Kim > > > * PS: Is there anybody working on AMD64 on-CPU GART driver like this? > > http://fxr.watson.org/fxr/source/drivers/char/agp/amd64-agp.c?v=linux-2.6.1 > > Documentation is here (Section 3.6.11-14): > > http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF There has been talk about adding support for this into the busdma framework. Another nice TODO item if anyone wants it. Scott
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