Date: Fri, 16 Dec 2005 11:23:15 -0800 From: Eric Anholt <eta@lclark.edu> To: Jung-uk Kim <jkim@FreeBSD.org> Cc: "O. Hartmann" <ohartman@mail.uni-mainz.de>, freebsd-amd64@FreeBSD.org Subject: Re: device drm with PCIe? Message-ID: <1134760995.1404.88.camel@leguin> In-Reply-To: <200512161358.34963.jkim@FreeBSD.org> References: <43A1636A.6030108@mail.uni-mainz.de> <200512161230.41499.jkim@FreeBSD.org> <1134757662.1404.81.camel@leguin> <200512161358.34963.jkim@FreeBSD.org>
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[-- Attachment #1 --] On Fri, 2005-12-16 at 13:58 -0500, Jung-uk Kim wrote: > On Friday 16 December 2005 01:27 pm, Eric Anholt wrote: > > On Fri, 2005-12-16 at 12:30 -0500, Jung-uk Kim wrote: > > > On Thursday 15 December 2005 07:36 am, O. Hartmann wrote: > > > > Normally 'device drm' is only useable in conjunction with > > > > 'device agp'. A lot of amd64 based boxes now use PEG slots for > > > > their graphics accelerators. Is it possible to utilize 'drm' > > > > with PCIe devices? > > > > > > Yes. It should work, at least in theory. ;-) > > > > > > > Does device agp has any effect on PCIe graphics accelerators? > > > > > > No. You don't need it for PCI-Express controller. > > > > Now, this is stuff I don't 100% understand, but what I've figured > > out so far is that for graphics, you're going to need a GART > > somewhere. For their PCIE cards, ATI deals with this by doing > > essentially the old PCIGART method but tweaked, in lieu of AGP. > > Intel's PCIE graphics, on the other hand, has a GART on their chips > > that is basically the same thing as their previous AGP GARTs, at > > least in terms of programming. So we expose their gart through the > > agp device still, even though the chipset may be PCIE. > > Ah, Eric is correct about the Intel part. But it was amd64 thread, so > I just assumed... :-( And now, for extra complication, we've got EM64Ts on i915 motherboards :) It also seems to me like we ought to be able to use the internal GART on real amd64s to avoid the card's PCIGART-ish method for PCIE radeons, right? -- Eric Anholt eta@lclark.edu http://people.freebsd.org/~anholt/ anholt@FreeBSD.org [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDoxQjHUdvYGzw6vcRArH2AJ0UhuuCaANTGgdz/ftkQKLI9m44UACeONar yZPKYk7m0bUkArPgETfo4O0= =0BiB -----END PGP SIGNATURE-----home | help
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