From owner-freebsd-hackers@FreeBSD.ORG Tue Jun 15 18:42:53 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9C27016A4CE for ; Tue, 15 Jun 2004 18:42:53 +0000 (GMT) Received: from rwcrmhc12.comcast.net (rwcrmhc12.comcast.net [216.148.227.85]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7E81D43D1F for ; Tue, 15 Jun 2004 18:42:53 +0000 (GMT) (envelope-from garycor@comcast.net) Received: from comcast.net (pcp09118143pcs.union01.nj.comcast.net[69.142.234.88]) by comcast.net (rwcrmhc12) with SMTP id <2004061518422401400c4ehfe> (Authid: garycor); Tue, 15 Jun 2004 18:42:24 +0000 Message-ID: <40CF44FB.6030709@comcast.net> Date: Tue, 15 Jun 2004 14:50:35 -0400 From: Gary Corcoran User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Wes Peters References: <40CDFD39.3090309@comcast.net> <200406151116.36832.wes@softweyr.com> In-Reply-To: <200406151116.36832.wes@softweyr.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-hackers@freebsd.org Subject: Re: FreeBSD or other BSD for no-MMU ARM processor ? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2004 18:42:53 -0000 Wes Peters wrote: > On Monday 14 June 2004 12:32 pm, Gary Corcoran wrote: > >>Does anyone know if there is a port of FreeBSD, or any of the >>other BSDs (e.g. NetBSD) for that matter, which will run on an >>ARM processor which does NOT have an MMU (Memory Management Unit)? > > > No, and there's not likely to be one anytime soon (unless you do it). Thanks for the definitive reply. We don't have enough resources for our work as it is, so no, we're not going to do it - we need something already available. > NetBSD has ports for a couple of ARM920T designs, which do have an MMU. > (I think they've recently popped a port for the Cogent CSB337, based on the > Atmel chip.) > > The general feeling seems to be that without an MMU and the added features > of memory protection it provides, the heavyweight process-oriented UNIX > kernel doesn't really offer much advantage over a lighter-weight solution > like RTEMS or eCos. The uClinux gang disagrees with this assessment, > obviously, so you do have that choice as well. Thanks for the pointers. My boss (and our customer) has mentioned eCos, so we'll be looking into that. RTEMS I hadn't heard of - I'll have to check into that too. But since I like, and am somewhat familiar with, *BSD, I thought I'd ask if that might be an option... Gary