From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Evert van Grootheest Subject: Re: DMA on ht6560b? Date: Mon, 18 Feb 2008 16:17:10 +0100 Message-ID: <47B9A176.9020808@caiway.nl> References: <47B992A1.2030008@caiway.nl> <20080218143003.39f22ca3@core> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from cardassian.kabelfoon.nl ([62.45.45.18]:53939 "EHLO cardassian.kabelfoon.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752424AbYBRPRM (ORCPT ); Mon, 18 Feb 2008 10:17:12 -0500 In-Reply-To: <20080218143003.39f22ca3@core> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: linux-ide@vger.kernel.org, bzolnier@gmail.com Alan Cox wrote: >> I think the ht6560b controller supports DMA. >> > > The data sheet doesn't. It's a PIO controller capable of PIO4 with 32bit > host to cpu transfers are best. > Hmm. But what do you then think that 2.2 did? I mean it now does 1.15M/s and in 2.2 it would do ~4M/s with DMA on. Were those perhaps ISA style DMA transfers (as opposed to BM-DMA)? I really should compile a 2.2 with ht6560b support... Thanks for answering, though, I don't know that much about ATA. Jan Evert