From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261151AbULWBtc (ORCPT ); Wed, 22 Dec 2004 20:49:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261156AbULWBtL (ORCPT ); Wed, 22 Dec 2004 20:49:11 -0500 Received: from THUNK.ORG ([69.25.196.29]:42912 "EHLO thunker.thunk.org") by vger.kernel.org with ESMTP id S261172AbULWBsy (ORCPT ); Wed, 22 Dec 2004 20:48:54 -0500 Date: Wed, 22 Dec 2004 20:45:27 -0500 From: "Theodore Ts'o" To: Rob Browning Cc: Pete Zaitcev , Matthew Dharm , "Randy.Dunlap" , Adrian Bunk , Greg KH , linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [linux-usb-devel] Re: RFC: [2.6 patch] let BLK_DEV_UB depend on EMBEDDED Message-ID: <20041223014527.GA25558@thunk.org> Mail-Followup-To: Theodore Ts'o , Rob Browning , Pete Zaitcev , Matthew Dharm , "Randy.Dunlap" , Adrian Bunk , Greg KH , linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org References: <20041220001644.GI21288@stusta.de> <20041220003146.GB11358@kroah.com> <20041220013542.GK21288@stusta.de> <20041219205104.5054a156@lembas.zaitcev.lan> <41C65EA0.7020805@osdl.org> <20041220062055.GA22120@one-eyed-alien.net> <20041219223723.3e861fc5@lembas.zaitcev.lan> <87u0qepxd3.fsf@trouble.defaultvalue.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87u0qepxd3.fsf@trouble.defaultvalue.org> User-Agent: Mutt/1.5.6+20040907i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 22, 2004 at 02:10:00AM -0600, Rob Browning wrote: > The sample Kconfig warnings I saw posted later in this thread would > certainly have given enough information to know to avoid the driver, > though if true, this might be even clearer: > > Note: this driver does not coexist well with usb-storage, and > usb-storage is is often the best driver for common devices like > external drive enclosures. At the moment, usb-storage may peform > dramatically better for those devices. > > If you're not certain you need this driver, you should probably > say 'N' here, and choose usb-storage instead. The other caveat which is worth adding is that currently, the UB device only supports a single LUN. Some devices, most notably USB readers that support multiple types of compact flash/secure digital/smart media/et.al., and the PalmOne T5 PDA export multiple LUN's. (I was scratching my head for a while trying to figure out why the T5 documentation claimed that you could access both the internal flash memory as well as the Secure Digital external memory via the USB interface until I realized it was because I was using the UB driver, and it didn't support multiple LUN's.) - Ted