From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH] ACPICA: delete check for AML access to port 0x81-83 Date: Thu, 9 Apr 2009 07:23:46 +0100 Message-ID: <20090409062346.GA8101@srcf.ucam.org> References: <7a3045780904051727o3780c7d3hebb26028a1b4eba5@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:48021 "EHLO vavatch.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751717AbZDIGXz (ORCPT ); Thu, 9 Apr 2009 02:23:55 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Len Brown Cc: Rodrigo Luiz , malattia@linux.it, linux-acpi@vger.kernel.org On Tue, Apr 07, 2009 at 05:56:09PM -0400, Len Brown wrote: > From: Len Brown > > Sony laptops apparently write 4-bytes (rather than 1 byte) > to debug port 0x80, which spews error messages: So admittedly I should just check the spec here instead, but: what does a 4 byte write to an io port mean? It seems a bit odd that Sonys could be scribbling over DMA1 without causing any problems. Is Windows turning this into a single byte write to the defined io port instead? -- Matthew Garrett | mjg59@srcf.ucam.org