From owner-freebsd-doc@FreeBSD.ORG Wed Jul 29 13:23:54 2009 Return-Path: Delivered-To: doc@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7082D106564A for ; Wed, 29 Jul 2009 13:23:54 +0000 (UTC) (envelope-from Benoit.LEBLANC@fr.thalesgroup.com) Received: from thsmsgxrt11p.thalesgroup.com (thsmsgxrt11p.thalesgroup.com [192.54.144.134]) by mx1.freebsd.org (Postfix) with ESMTP id 23F258FC0A for ; Wed, 29 Jul 2009 13:23:54 +0000 (UTC) (envelope-from Benoit.LEBLANC@fr.thalesgroup.com) Received: from thsmsgirt21p.corp.thales (unknown [10.33.231.5]) by thsmsgxrt11p.thalesgroup.com (Postfix) with ESMTP id E1C1E488FC9 for ; Wed, 29 Jul 2009 15:11:03 +0200 (CEST) Received: from thsmsgiav12p.corp.thales (10.33.231.32) by thsmsgirt21p.corp.thales (8.5.103) id 4A65A10D000F34F7 for doc@FreeBSD.org; Wed, 29 Jul 2009 15:11:03 +0200 Received: from (unknown [10.33.231.2]) by thsmsgiav12p.corp.thales with smtp id 035b_56c4_44d5dba8_7c41_11de_bba1_0013725118e7; Wed, 29 Jul 2009 15:11:03 +0200 Received: from nodalthc2.clb.tcfr.thales (unknown [10.33.8.66]) by thsmsgirt12p.corp.thales (Postfix) with ESMTP id 9CD1C391BAE for ; Wed, 29 Jul 2009 15:11:03 +0200 (CEST) Received: by nodalthc2.clb.tcfr.thales with Internet Mail Service (5.5.2655.55) id ; Wed, 29 Jul 2009 15:11:03 +0200 Message-ID: From: Benoit.LEBLANC@fr.thalesgroup.com To: doc@FreeBSD.org Date: Wed, 29 Jul 2009 15:11:03 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2655.55) Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Subject: Question about DMA X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jul 2009 13:23:54 -0000 Mister, I read your article about DMA since I have to use a 8237 DMA = controller. I have a question and can't find (or understand) the answer: How does the peripheral asking for a DMA transfer specify to the CPU if = it asks for a memory/IO read/write cycle? Thank you very much for your help, Regards, Beno=EEt le Blanc THALES Communications EDS/SIE/CAE 01 46 13 22 76 160 Boulevard de Valmy - BP 82=20 92704 COLOMBES CEDEX * N'imprimez ce message qu'en cas de n=E9cessit=E9.