From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: FB model basic issues (WAS: radeon, apertures & memory mapping) Date: Thu, 17 Mar 2005 10:27:56 +1100 Message-ID: <1111015676.7192.58.camel@gaston> References: <1110784327.5787.288.camel@gaston> <1110817205.4004.527.camel@localhost> <1110837171.5863.16.camel@gaston> <1110838356.4003.548.camel@localhost> <1110839873.5673.41.camel@gaston> <1110862777.4044.592.camel@localhost> <20050315060138.GA13064@sci.fi> <1110926659.25201.11.camel@gaston> <20050315230522.GA1444@sci.fi> <1110930551.649.47.camel@gaston> <20050316205511.GA18107@sci.fi> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable In-Reply-To: <20050316205511.GA18107@sci.fi> 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: Ville =?ISO-8859-1?Q?Syrj=E4l=E4?= Cc: Jon Smirl , Michel =?ISO-8859-1?Q?D=E4nzer?= , dri-devel@lists.sourceforge.net, Linux Fbdev development list , xorg@lists.freedesktop.org On Wed, 2005-03-16 at 22:55 +0200, Ville Syrj=E4l=E4 wrote: > On Wed, Mar 16, 2005 at 10:49:11AM +1100, Benjamin Herrenschmidt wrote: > > In the meantime, can you tell me more about your arbitration scheme ? >=20 > There is a lock associated with the graphics card. The lock is always=20 > taken before programming the hardware. Other things wanting access to t= he=20 > hardware wait until the lock is released. Ok, so it would be easy to have directFB use an external arbiter without breaking existing clients ? It will need at least to use the vga arbiter that I'm about to finish, that should allow at least to have X on one card and directFB on another without conflict. Ben.