linux-kernel - Re: [RFC] [PATCH 1/2] mmc: split mmc_sd_init

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Message-ID: <m3hblk8224.fsf@pullcord.laptop.org>
Date:	Thu, 03 Jun 2010 13:21:23 -0400
From:	Chris Ball <cjb@...top.org>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mmc\@vger.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 1/2] mmc: split mmc_sd_init_card()

Hi,

   > 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

Michał, could you let us know which SD-combo device(s) in particular
you've been working with?

- Chris.
-- 
Chris Ball   <cjb@...top.org>
One Laptop Per Child
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