Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755329Ab0FCShh (ORCPT ); Thu, 3 Jun 2010 14:37:37 -0400 Received: from rere.qmqm.pl ([89.167.52.164]:40090 "EHLO rere.qmqm.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753520Ab0FCShf (ORCPT ); Thu, 3 Jun 2010 14:37:35 -0400 Date: Thu, 3 Jun 2010 20:37:34 +0200 From: =?iso-8859-2?Q?Micha=B3_Miros=B3aw?= To: Chris Ball Cc: Adrian Hunter , Andrew Morton , "linux-mmc@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [RFC] [PATCH 1/2] mmc: split mmc_sd_init_card() Message-ID: <20100603183734.GA9141@rere.qmqm.pl> References: <1-1000-12432-1274803827-7569@rere.qmqm.pl> <20100528144027.3c868841.akpm@linux-foundation.org> <20100531155846.GA9493@rere.qmqm.pl> <4C0774A8.2030704@nokia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1494 Lines: 31 On Thu, Jun 03, 2010 at 01:21:23PM -0400, Chris Ball wrote: > > That is a bit vague. An SD card is a memory. An SDIO "card" is > > an I/O connection made using the same physical interface as an SD > > card and a very similar protocal to SD cards (at least with > > respect to reading and writing). I do not understand how a card > > can be SD and SDIO. Are you sure you are not talking about a > > controller that supports SD and SDIO? A lot of controllers do > > that. > Adrian, I presume we're talking about something like: > http://www.arasan.com/products/sd/SD-Combo-Flyer.pdf > Micha?, could you let us know which SD-combo device(s) in particular > you've been working with? The card I'm using is one I'm working on (SDIO-like card interoperating with optional SD memory card) and I can't disclose what it really is nor when it will be available. Spectec SDG-810 (GPS with micro-SD slot) looks like a similar SD-combo card. Answering Adrian's question: SDIO uses separate command set (CMD5 for init, CMD52 and CMD53 for IO transactions) than SD memory and so the parts can coexist in one card (provided some additional constraints are met). The SDIO specification covers the details. Best Regards, Micha? Miros?aw -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/