From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751732AbXDQG7o (ORCPT ); Tue, 17 Apr 2007 02:59:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751739AbXDQG7o (ORCPT ); Tue, 17 Apr 2007 02:59:44 -0400 Received: from py-out-1112.google.com ([64.233.166.181]:24990 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751698AbXDQG7n (ORCPT ); Tue, 17 Apr 2007 02:59:43 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=hDrAkpOaIrbcphhkefMYLXO9Zy3OIX0r/sZ5FJaKoEr+NujKfKsGfdzu9Six/0KRx87mSowICvFdPDVfTISW8OyYbPwhTIbotK8TtITniC1/Q/EYgTpL/jMOfgOSipErOYOR1yxS6U0BU+lWUrwEF8hNgup4q0yFgaqQl3DtMnI= Message-ID: Date: Tue, 17 Apr 2007 12:29:42 +0530 From: "Madhusudhan c" To: linux-kernel@vger.kernel.org Subject: MMCv4 support (8-bit support missing) Cc: philipl@overt.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Pierre/philip, This is regarding the MMCv4 support that came in as part of the MMC core of 2.6.20 linux kernel version. 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 . To support 8-bit transfers the core needs to implement "bus testing procedure". This requires support for CMD19 and CMD14. Why is the support for bus testing procedure msiing from the MMCv4 support? Regards, Madhu