From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030727AbXDRIql (ORCPT ); Wed, 18 Apr 2007 04:46:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030682AbXDRIqk (ORCPT ); Wed, 18 Apr 2007 04:46:40 -0400 Received: from 85.8.24.16.se.wasadata.net ([85.8.24.16]:45081 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030649AbXDRIqZ (ORCPT ); Wed, 18 Apr 2007 04:46:25 -0400 Message-ID: <4625DAFC.4000208@drzeus.cx> Date: Wed, 18 Apr 2007 10:46:52 +0200 From: Pierre Ossman User-Agent: Thunderbird 2.0.0.0 (X11/20070414) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=_hera.drzeus.cx-20448-1176885983-0001-2" To: Madhusudhan c CC: linux-kernel@vger.kernel.org, philipl@overt.org Subject: Re: MMCv4 support (8-bit support missing) References: In-Reply-To: X-Enigmail-Version: 0.95.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_hera.drzeus.cx-20448-1176885983-0001-2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Madhusudhan c wrote: > Hi Pierre/philip, >=20 Hi Madhusudhan, Feel free to add me as cc in the future if you want me to notice your mai= l ;) > This is regarding the MMCv4 support that came in as part of the MMC > core of 2.6.20 linux kernel version. >=20 > The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit > support seems to be missing from the MMCv4 support implemented by > Philip Langdale . As soon as hardware with specs is available we'll start hacking. :) > To support 8-bit transfers the core needs to implement "bus testing > procedure". This requires support for CMD19 and CMD14. >=20 > Why is the support for bus testing procedure msiing from the MMCv4 supp= ort? >=20 We haven't determined it as necessary, and as Philip commented, most (if = not all) controllers cannot properly support the test. Rgds Pierre --=_hera.drzeus.cx-20448-1176885983-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGJdr/7b8eESbyJLgRAm5AAJ9Tu+gMzHKl31PLsx2RGkdnNyzdeACgmtvh OaRwQrC1BTGh3ipppSrlXho= =YvTj -----END PGP SIGNATURE----- --=_hera.drzeus.cx-20448-1176885983-0001-2--