From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Slagter Subject: Re: Playing with SATA NCQ Date: Sun, 29 May 2005 19:23:52 +0200 Message-ID: <1117387432.4851.13.camel@localhost.localdomain> References: <20050526140058.GR1419@suse.de> <1117382598.4851.3.camel@localhost.localdomain> <4299EF16.2050208@pobox.com> <1117385429.4851.8.camel@localhost.localdomain> <4299F4E2.4020305@pobox.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from oldconomy.demon.nl ([212.238.217.56]:46262 "EHLO artemis.slagter.name") by vger.kernel.org with ESMTP id S261196AbVE2RYF (ORCPT ); Sun, 29 May 2005 13:24:05 -0400 In-Reply-To: <4299F4E2.4020305@pobox.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, Jens Axboe On Sun, 2005-05-29 at 12:59 -0400, Jeff Garzik wrote: > >>Nope. ata_piix does not support NCQ (because the h/w doesn't support). > > If I understand this correctly: NCQ does not work on ICH7 in native mode > > (using ata_piix) because in this mode there is no NCQ available, right? > > To be more specific, there are these modes: > > legacy mode no NCQ > combined mode no NCQ > native mode no NCQ > AHCI mode NCQ Thx. > > My question was if there is a fundamental reason why the AHCI mode of > > the ICH6/7 must be enabled by the BIOS, is there a reason why the kernel > > doesn't do it, or can't do it? > > The BIOS sets up PCI resources necessary to use AHCI mode. Ok. So there's absolutely no way to do that afterwards? It'd really be a pity :-( On the same subject: is there a reason why ICH6 gets "BAR0-3 ignored" and always gets the legacy i/o ports and IRQ's assigned? I'd say there is absolutely no need to be compatible in this way, the PCI code can assign the IRQ and I/O ports as with any other PCI device?