From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753437AbXC2NF0 (ORCPT ); Thu, 29 Mar 2007 09:05:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753441AbXC2NF0 (ORCPT ); Thu, 29 Mar 2007 09:05:26 -0400 Received: from smtp4-g19.free.fr ([212.27.42.30]:36178 "EHLO smtp4-g19.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753437AbXC2NFY (ORCPT ); Thu, 29 Mar 2007 09:05:24 -0400 Message-ID: <460BB958.4070307@free.fr> Date: Thu, 29 Mar 2007 15:04:24 +0200 From: John User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061108 SeaMonkey/1.0.6 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: Lee Revell , mingo@elte.hu, akpm@osdl.org, linux-apps@vger.kernel.org, linux.kernel@free.fr Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically References: <46094728.40300@free.fr> <75b66ecd0703271341x34463c49w64bdac21a9741355@mail.gmail.com> <460A297A.2030200@free.fr> <75b66ecd0703280916v5a9ed49u2f2549a455e832f1@mail.gmail.com> In-Reply-To: <75b66ecd0703280916v5a9ed49u2f2549a455e832f1@mail.gmail.com> 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 Lee Revell wrote: > John wrote: > >> Would someone know how to disable SMM in this BIOS? > > There's no generic way. I understand. Would someone know how to disable SMM in the VIA Pro133T chipset (VT82C596B south bridge). What I/O ports do I need to write to, and what values should I write to these ports? > Try disabling USB keyboard emulation and any unused peripherals. I have disabled everything I could find in the BIOS. Serial and parallel ports, USB, integrated sound, APM, ACPI, booting from exotic hardware or from the network. To no avail :-( > Also google "RTAI disable SMM". I see that they have a Linux kernel module to disable SMM in Intel chipsets. But I didn't see the equivalent for VIA chipsets. >>> Is this a laptop? They are plagued with SMM problems... >> >> No it is an "indutrial" motherboard. >> Although I don't know what makes it "industrial". > > One would really hope that such a device would be designed for machine > control and similar RT apps and thus free of SMM... Indeed... I wonder if VIA thinks their old chipsets were industrial-grade. Regards.