From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sven Luther Subject: Re: [directfb-dev] [Linux-fbdev-devel] DirectFB without FBDev Date: Thu, 29 May 2008 18:54:52 +0200 Message-ID: <20080529165452.GA7708@powerlinux.fr> References: <483D7344.6030503@directfb.org> <483D9453.1080700@directfb.org> <483D9C30.8010301@acdstar.com> <483D9F4E.4000707@directfb.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <483D9F4E.4000707-iGvX3keArt1g9hUCZPvPmw@public.gmane.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: directfb-users-bounces-iGvX3keArt1g9hUCZPvPmw@public.gmane.org Errors-To: directfb-users-bounces-iGvX3keArt1g9hUCZPvPmw@public.gmane.org To: Denis Oliver Kropp Cc: directfb-users-iGvX3keArt1g9hUCZPvPmw@public.gmane.org, "Brian G. Rhodes" , linux-fbdev-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, directfb-dev-iGvX3keArt1g9hUCZPvPmw@public.gmane.org, Geert Uytterhoeven On Wed, May 28, 2008 at 08:07:10PM +0200, Denis Oliver Kropp wrote: > Brian G. Rhodes wrote: > I don't think a new kernel graphics interface should be added, instead using > UIO to access MMIO, DMA and IRQs would be enough and implement most of the > graphics driver in user space. Downside is to loose the kernel console which > you usually don't need on an embedded device... > > For acceleration and DMA/IRQ based programming, I still need to check if a > user space approach would be enough. So far I always handled IRQs in kernel > space for timing/performance reasons... Euh, well, i think the X / OpenGL approach showed us that to do DMA/IRQ, you need a kernel module, and what X/OpenGL is the DRI thingy. Would it make sense for directfb to re-use this selfsame infrasturcture, which already exists in the kernel, and is used by X, so kind of guaranteed to be available for many graphic cards ? But maybe it is too complex or something ? Friendly, Sven Luther