From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261224AbVGTQ02 (ORCPT ); Wed, 20 Jul 2005 12:26:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261398AbVGTQ01 (ORCPT ); Wed, 20 Jul 2005 12:26:27 -0400 Received: from b.mail.sonic.net ([64.142.19.5]:7600 "EHLO b.mail.sonic.net") by vger.kernel.org with ESMTP id S261224AbVGTQ00 (ORCPT ); Wed, 20 Jul 2005 12:26:26 -0400 Date: Wed, 20 Jul 2005 09:26:20 -0700 From: David Hinds To: somshekar.c.kadam@in.abb.com Cc: linux-kernel@vger.kernel.org Subject: Re: Sandisk Compact Flash Message-ID: <20050720162620.GA4555@sonic.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 20, 2005 at 12:49:00PM +0530, somshekar.c.kadam@in.abb.com wrote: > > Hi David , > > On my controller CF INPACK pin is connected to 3.3v. so Comapct > flash with DMA capabilty will not be supported , i understood this . > but i did not undesrtand why only PIO mode 1 is supported is it , > why not PIO mode 4 , is it a limitation of pcmcia driver , correct > me if i am wrong The 16-bit PCMCIA bus is maxed out at about 1 MB/sec; that's all the bandwidth there is. What your card supports is irrelevant. I'm not sure whether the PCMCIA mode actually corresponds to any of the official PIO modes 0, 1, etc. It is just "slow". -- Dave