From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030333AbWAXEuY (ORCPT ); Mon, 23 Jan 2006 23:50:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030335AbWAXEuY (ORCPT ); Mon, 23 Jan 2006 23:50:24 -0500 Received: from ns.amrita.ac.in ([203.197.150.194]:35211 "EHLO bhadra.amrita.ac.in") by vger.kernel.org with ESMTP id S1030333AbWAXEuW (ORCPT ); Mon, 23 Jan 2006 23:50:22 -0500 X-Antivirus-AMRITA-Mail-From: harish@arl.amrita.edu via bhadra.amrita.ac.in X-Antivirus-AMRITA: 1.25-st-qms (Clear:RC:0(203.197.150.195):SA:0(-2.6/3.5):. Processed in 0.920205 secs Process 24161) Message-ID: <43D5B473.3060006@arl.amrita.edu> Date: Tue, 24 Jan 2006 10:30:35 +0530 From: Harish K Harshan User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: DMA Transfer problem Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, Im having problems with DMA transfer on Linux, for an ADC card. The card is AxiomTek AX5621H, and can use DMA channels 1 and 3. I tried both the channels, but the DMA transfers are irregular (i.e.) at different speeds (which of course is not acceptable, since that application is time critical). The device driver (which I wrote) seems to work fine for all the other systems I tried it on. But this problem occurs only on one particular model of computer (Chino-Laxsons Pentium-4 boards). I tried another system with the same configuration, but the same resulted. After some time of execution, I get the kernel panic screen, which says the CPU context is corrupt. Please help me with this problem, as I need to get this driver working somehow on the P4 systems. I tried the Redhat-9 kernel (2.4.20-8) and the debian kernel too (2.2.20).... gave the same results. Thanks in advance, Harish.