Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932087AbVK1Qzk (ORCPT ); Mon, 28 Nov 2005 11:55:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751304AbVK1Qzk (ORCPT ); Mon, 28 Nov 2005 11:55:40 -0500 Received: from relais.videotron.ca ([24.201.245.36]:24776 "EHLO relais.videotron.ca") by vger.kernel.org with ESMTP id S1751303AbVK1Qzj (ORCPT ); Mon, 28 Nov 2005 11:55:39 -0500 Date: Mon, 28 Nov 2005 11:55:10 -0500 (EST) From: Nicolas Pitre Subject: Re: How can I prevent MTD to access the end of a flash device ? In-reply-to: X-X-Sender: nico@localhost.localdomain To: Franck Cc: lkml Message-id: MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII Content-transfer-encoding: 7BIT References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 804 Lines: 24 On Thu, 24 Nov 2005, Franck wrote: > > Yes. It was tested on ARM only though. Some architectures like i386 > > for example might need special tricks to implement this. > > > > do you know why ? Apparently i386 might have issues having two virtual mappings for the same physical address range. This can be worked around in the map driver by relying on the knowledge of flash aliases on the bus. > What was the gain on ARM ? The ability to use burst transfers which are only activated with cached memory, hence twice the read speed or more. Nicolas - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/