From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: Re: SDIO "SD2" vs. SD-card "SD3" interface on BayTrail Date: Tue, 04 Jul 2017 16:53:51 +0300 Message-ID: <1499176431.22624.255.camel@linux.intel.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Return-path: Received: from mga01.intel.com ([192.55.52.88]:62236 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751648AbdGDNxy (ORCPT ); Tue, 4 Jul 2017 09:53:54 -0400 In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Stefan Roese , linux-mmc@vger.kernel.org Cc: Adrian Hunter On Tue, 2017-07-04 at 14:53 +0200, Stefan Roese wrote: > Hi, > > we are currently investigating, if its possible to connect a SDIO > device (WLAN module) to the SD-card interface "SD3" of the BayTrail > SoC instead of the SDIO interface "SD2". The BayTrail manual states,  > that the SDIO interface is capable of connecting SDIO devices. Is > this also possible for the SD-card interface "SD3", even if its not > explicitly mentioned in the manual? If not, why is this not possible? > > Any insight on this would be really helpful. Hmm... I have no documentation for SD/SDIO/eMMC for BayTrail except the public one. Internally I found some charts that shows similarities between two. So, taking that into consideration I would suggest to try it out on real hardware (MinnowBoard MAX, for example), only impediment I can see is the absence of support in the drivers in Linux OS. If you need it only in U-Boot, you perhaps may fix it easily. P.S. Adrian on vacation. -- Andy Shevchenko Intel Finland Oy