From owner-freebsd-arm@FreeBSD.ORG Thu Jun 7 16:52:16 2007 Return-Path: X-Original-To: arm@freebsd.org Delivered-To: freebsd-arm@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 1E79516A400 for ; Thu, 7 Jun 2007 16:52:16 +0000 (UTC) (envelope-from nb@synthcom.com) Received: from synthcom.com (static-71-245-103-2.ptldor.fios.verizon.net [71.245.103.2]) by mx1.freebsd.org (Postfix) with ESMTP id EF90F13C48C for ; Thu, 7 Jun 2007 16:52:15 +0000 (UTC) (envelope-from nb@synthcom.com) Received: from static-71-245-103-2.ptldor.fios.verizon.net (static-71-245-103-2.ptldor.fios.verizon.net [71.245.103.2]) by synthcom.com (8.13.8/8.13.8) with ESMTP id l57GqFE9075409 for ; Thu, 7 Jun 2007 09:52:15 -0700 (PDT) (envelope-from nb@synthcom.com) Date: Thu, 7 Jun 2007 09:52:15 -0700 (PDT) From: Neil Bradley In-Reply-To: <54244.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181211368.squirrel@webmail.alpha-tierchen.de> Message-ID: <20070607095022.U43808@synthcom.com> References: <50503.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181202550.squirrel@webmail.alpha-tierchen.de> <20070607005128.T43808@synthcom.com> <53054.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181203617.squirrel@webmail.alpha-tierchen.de> <20070607023728.X43808@synthcom.com> <54244.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181211368.squirrel@webmail.alpha-tierchen.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (synthcom.com [71.245.103.2]); Thu, 07 Jun 2007 09:52:15 -0700 (PDT) Cc: arm@freebsd.org Subject: Re: 4-bit SD Card mode X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Jun 2007 16:52:16 -0000 >> What is the CPU in question? > There are issues with AT91RM9200, but now I think the problem is something > else than I assumed. One possibility - If DMA mode is being used, has there been a cache flush on the region of memory where the SD card reads into? The ARM7/9 is *NOT* cache coherent with DMA peripherals, which can give all kinds of bizarre problems if the destination buffers are in the system's cache. -->Neil ---------------------------------------------------------------------------- C. Neil Bradley - KE7IXP - The one eyed man in the land of the blind is not king. He's a prisoner.