From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: sata_mv 0000:03:06.0: PCI ERROR; PCI IRQ cause=0x30000040 Date: Thu, 08 Oct 2009 23:16:05 -0400 Message-ID: <4ACEAAF5.90304@rtr.ca> References: <1254546642.1438.135.camel@giskard> <4ACA6904.1060509@rtr.ca> <4ACB3741.2030101@gmail.com> <1254852272.1471.172.camel@giskard> <4ACBA33C.7090606@rtr.ca> <1254873978.1471.463.camel@giskard> <1254879618.1471.525.camel@giskard> <4ACC076F.7020000@rtr.ca> <1255020134.30440.698.camel@giskard> <4ACEA8FB.4060901@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:38249 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760197AbZJIDQn (ORCPT ); Thu, 8 Oct 2009 23:16:43 -0400 In-Reply-To: <4ACEA8FB.4060901@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Bernie Innocenti Cc: Harri Olin , linux-ide@vger.kernel.org, lkml , sysadmin Mark Lord wrote: > Bernie Innocenti wrote: >> >> I want to try reducing the frequency of the PCI-X bus, but the BIOS does >> not seem to provide a setting for it. Is there another way? > .. > > Nothing that's easy. .. Adding to that: there is a register on the chip, which software could use to override the normal auto-detected PCI mode (bus speed) for the chip. This could be used to, say, select 100Mhz or 66Mhz, or even 33Mhz operation. BUT.. the register is autodetected from the bus at power-on, and so if software wants to override that (by rewriting the reg), it will also need to reset the PCI bus afterward. Which requires knowing how to reset a PCI bridge, something I don't know about. Cheers