From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 03 Feb 2003 12:26:47 +0000 (GMT) Received: from p508B76F7.dip.t-dialin.net ([IPv6:::ffff:80.139.118.247]:16041 "EHLO dea.linux-mips.net") by linux-mips.org with ESMTP id ; Mon, 3 Feb 2003 12:26:46 +0000 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.6) id h13CQY021345; Mon, 3 Feb 2003 13:26:34 +0100 Date: Mon, 3 Feb 2003 13:26:34 +0100 From: Ralf Baechle To: Nemanja Popov Cc: linux-mips@linux-mips.org Subject: Re: Lexra' s MMU Message-ID: <20030203132634.C18186@linux-mips.org> References: <001701c2cb62$3eccd500$e000a8c0@micronasnit.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: <001701c2cb62$3eccd500$e000a8c0@micronasnit.com>; from Nemanja.Popov@micronasnit.com on Mon, Feb 03, 2003 at 09:57:02AM +0100 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-archive-position: 1296 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 Mon, Feb 03, 2003 at 09:57:02AM +0100, Nemanja Popov wrote: > Does Lexra's CPU LX4280 has MMU. I've found from dateaheet LX4280 that > there is only SMMU (S stands for Simple) which does not include TLB and > exceptions related to that. > I've noticed port for lexra (among others also for LX4280) on cvs. Is it > possible to run linux on that kind of processor, and if so will it manage > user space application as it should with mmu. TLB-less processors aren't supported at all by Linux 2.4. Linux 2.5 has the infrastructure in place to support TLB-less processors but we don't support that on MIPS. I guess it's probably not interesting because TLB-less CPUs tend to be part of systems that are too resource constrained to be of interest for use with Linux but I certainly wouldn't refuse such patches. The CVS kernel does not support Lexra processors. There are a bit over one year old Lexra patches for 2.4. Me and the author agreed to not merge those patches into the CVS kernel because Lexra is a dead company. Ralf