From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932136AbWFFHVn (ORCPT ); Tue, 6 Jun 2006 03:21:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932135AbWFFHVn (ORCPT ); Tue, 6 Jun 2006 03:21:43 -0400 Received: from tim.rpsys.net ([194.106.48.114]:8842 "EHLO tim.rpsys.net") by vger.kernel.org with ESMTP id S932134AbWFFHVm (ORCPT ); Tue, 6 Jun 2006 03:21:42 -0400 Subject: Re: 2GB MMC/SD cards From: Richard Purdie To: Pierre Ossman , linux-kernel@vger.kernel.org, rmk+lkml@arm.linux.org.uk Cc: Jordan Crouse In-Reply-To: <20060605222908.GC4996@cosmic.amd.com> References: <4481FB80.40709@drzeus.cx> <20060605222908.GC4996@cosmic.amd.com> Content-Type: text/plain Date: Tue, 06 Jun 2006 08:17:00 +0100 Message-Id: <1149578221.5520.4.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2006-06-05 at 16:29 -0600, Jordan Crouse wrote: > I'm not 100% sure what the community stance is on using the simplified specs. > I do believe the answer lies definitively within, but I'll refrain from > quoting it to avoid any legal complaints. For the longest time, my gut > feeling has been that 512 byte writes were always accepted - but since all of > our 2G and 4G cards support WRITE_BL_PARTIAL, we haven't had a chance to > prove the argument one way or the other. > > We first heard about very large card issues from one of our customers, and > we haven't heard any more problems since we gave them a patch to force the > sector size on all SD/MMC cards to 512 bytes. Thats just anecdotal evidence, > but it is food for thought. For what its worth this is the feeling I get from the users of the Zaurus kernels as well. For the PXA driver, there is the added complication that it doesn't support block sizes > 1023 but I've had no complaints since I limited it to 512. Richard