From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= Subject: Re: FB model basic issues (WAS: radeon, apertures & memory mapping) Date: Thu, 17 Mar 2005 03:25:03 +0200 Message-ID: <20050317012503.GA20844@sci.fi> References: <20050315060138.GA13064@sci.fi> <4236C770.8020101@hispeed.ch> <1110907029.4001.624.camel@localhost> <1110942559.24296.107.camel@gaston> <20050316200808.GB6651@sci.fi> <20050316210812.GA19937@sci.fi> <1111015801.15509.62.camel@gaston> <20050317004713.GB8081@sci.fi> <1111021978.15510.97.camel@gaston> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline In-Reply-To: <1111021978.15510.97.camel@gaston> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: xorg-bounces@lists.freedesktop.org Errors-To: xorg-bounces@lists.freedesktop.org Content-Type: text/plain; charset="iso-8859-1" To: Benjamin Herrenschmidt Cc: Linux Fbdev development list , Michel =?iso-8859-1?Q?D=E4nzer?= , Jon Smirl , xorg@lists.freedesktop.org, Alex Deucher , dri-devel@lists.sourceforge.net On Thu, Mar 17, 2005 at 12:12:58PM +1100, Benjamin Herrenschmidt wrote: >=20 > > I understand you can't have userspace program the accelerator while=20 > > someone else is doing the same thing. Oh and I now understand that th= e=20 > > same really applies to direct framebuffer access due to the swapper. = =20 >=20 > And you can't have someone program the accelerator while somebody does > direct access neither. It's basically all exclusive. I haven't seen that happen on any hardware I own. Matrox specs explicitly= =20 mention that there is no need to synchronize accelerator and direct=20 framebuffer access. --=20 Ville Syrj=E4l=E4 syrjala@sci.fi http://www.sci.fi/~syrjala/