From owner-freebsd-hackers@FreeBSD.ORG Tue Jun 15 18:16:31 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 5337716A4CE for ; Tue, 15 Jun 2004 18:16:31 +0000 (GMT) Received: from smtp.omnis.com (smtp.omnis.com [216.239.128.26]) by mx1.FreeBSD.org (Postfix) with ESMTP id 10C4A43D1F for ; Tue, 15 Jun 2004 18:16:31 +0000 (GMT) (envelope-from wes@softweyr.com) Received: from salty.rapid.stbernard.com (unknown [198.147.128.71]) by smtp-relay.omnis.com (Postfix) with ESMTP id 2E7B6FCF89; Tue, 15 Jun 2004 11:15:52 -0700 (PDT) From: Wes Peters Organization: Softweyr.com To: Gary Corcoran , freebsd-hackers@freebsd.org Date: Tue, 15 Jun 2004 11:16:36 -0700 User-Agent: KMail/1.5.4 References: <40CDFD39.3090309@comcast.net> In-Reply-To: <40CDFD39.3090309@comcast.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200406151116.36832.wes@softweyr.com> 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 18:16:31 -0000 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). 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. -- "Where am I, and what am I doing in this handbasket?" Wes Peters wes@softweyr.com