From mboxrd@z Thu Jan 1 00:00:00 1970 From: "mjander " Subject: Scatter Gather DMA Date: Wed, 5 Mar 2003 12:09:21 -0400 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <200303051209.AA33751384@embedded.cl> Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from embedded.cl (correo1.ispchile.cl [200.29.13.60]) by alsa.alsa-project.org (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id QAA08762 for ; Wed, 5 Mar 2003 16:08:15 +0100 Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Hi, Another question... :) The Aureal Vortex has Scatter Gather DMA's for each audio channel. But these SG DMA support only max 4 pages. Each page can have a programable size of upto 4 KB. I was studying the ALSA SG scheme and it doesnt seme to fit into the aureal vortex SG buffer scheme, because ALSA, as far as i understood, only allows pages of the kernel PAGE_SIZE size, and allocates as many pages (without cound limit ?) until the buffer size is reached. But the PAGE_SIZE around 0x400 or 0x800, which is rather small. On the Aureal vortex soundcard side i have 4 registers for page base address, and some sort of config regs to configure each page size and the next page for each page. I just dont understand how could i plug this two apparently incompatible things together. Thank you very much. Manuel Jander. . __________________________________________________ Enviado via NewPlanet WebMail en embedded.cl ------------------------------------------------------- This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger for complex code. Debugging C/C++ programs can leave you feeling lost and disoriented. TotalView can help you find your way. Available on major UNIX and Linux platforms. Try it free. www.etnus.com