From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 01 May 2003 20:27:01 +0100 (BST) Received: from p508B5752.dip.t-dialin.net ([IPv6:::ffff:80.139.87.82]:30389 "EHLO dea.linux-mips.net") by linux-mips.org with ESMTP id ; Thu, 1 May 2003 20:26:48 +0100 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.6) id h41JQPX23531; Thu, 1 May 2003 21:26:25 +0200 Date: Thu, 1 May 2003 21:26:25 +0200 From: Ralf Baechle To: ashish anand Cc: linux-mips@linux-mips.org Subject: Re: running purely uncached .. Message-ID: <20030501212625.A17635@linux-mips.org> References: <20030501143241.1494.qmail@webmail35.rediffmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20030501143241.1494.qmail@webmail35.rediffmail.com>; from ashish_ibm@rediffmail.com on Thu, May 01, 2003 at 02:32:41PM -0000 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) X-archive-position: 2247 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Thu, May 01, 2003 at 02:32:41PM -0000, ashish anand wrote: > in my kernel source tree i observed in arch/mips/mm/r4xx0.c though > there are other support routines for flush , invalidate and maintain > the cache consistency ..but there is no mention of running purely > uncached using the old style code CONFIG_MIPS_UNCACHED or otherwise. CONFIG_MIPS_UNCACHED still exists but it's only selectable when SMP support is disabled. Usual warning applies - running uncached is not well supported and is extremly slow. It is mostly intended for hardware people who need to observe all actions of the processor externally. Ralf