From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from oss.sgi.com (localhost [127.0.0.1]) by oss.sgi.com (8.12.3/8.12.3) with ESMTP id g4FLtInC002410 for ; Wed, 15 May 2002 14:55:18 -0700 Received: (from majordomo@localhost) by oss.sgi.com (8.12.3/8.12.3/Submit) id g4FLtIt7002409 for linux-mips-outgoing; Wed, 15 May 2002 14:55:18 -0700 X-Authentication-Warning: oss.sgi.com: majordomo set sender to owner-linux-mips@oss.sgi.com using -f Received: from mms1.broadcom.com (mms1.broadcom.com [63.70.210.58]) by oss.sgi.com (8.12.3/8.12.3) with SMTP id g4FLtCnC002406 for ; Wed, 15 May 2002 14:55:12 -0700 Received: from 63.70.210.1 by mms1.broadcom.com with ESMTP (Broadcom MMS-1 SMTP Relay (MMS v4.7)); Wed, 15 May 2002 14:55:11 -0700 X-Server-Uuid: 1e1caf3a-b686-11d4-a6a3-00508bfc9ae5 Received: from mail-sj1-1.sj.broadcom.com (mail-sj1-1.sj.broadcom.com [10.16.128.231]) by mon-irva-11.broadcom.com (8.9.1/8.9.1) with ESMTP id OAA24404; Wed, 15 May 2002 14:55:40 -0700 (PDT) Received: from broadcom.com (kwalker@dt-sj3-158 [10.21.64.158]) by mail-sj1-1.sj.broadcom.com (8.8.8/8.8.8/MS01) with ESMTP id OAA19106; Wed, 15 May 2002 14:55:39 -0700 (PDT) Message-ID: <3CE2D95B.E1E43662@broadcom.com> Date: Wed, 15 May 2002 14:55:39 -0700 From: "Kip Walker" Organization: Broadcom Corp. BPBU X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.5-beta4va3.20 i686) X-Accept-Language: en MIME-Version: 1.0 To: "Matthew Dharm" cc: Linux-MIPS Subject: Re: MIPS 64? References: <20020515214818.GA1991@nevyn.them.org> X-WSS-ID: 10FC06B5660008-01-01 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mips@oss.sgi.com Precedence: bulk Since traditionally the mips kernel could only manage RAM reachable by Kseg you were limited to 512MB, right? But now the High Memory stuff is stable enough that you can reach any RAM that's physically addressable in 32-bits. And after that, there's the 64bit-physical-address extension which allows you to reach physical pages that need > 32-bits to address. Kip Daniel Jacobowitz wrote: > > On Wed, May 15, 2002 at 02:34:47PM -0700, Matthew Dharm wrote: > > So... I'm looking at porting Linux to a system with 1.5GiB of RAM. > > That kinda blows the 32-bit MIPS port option right out of the water... > > Not unless you count bits differently than I do... 32-bit is 4 GiB. Is > there any reason MIPS has special problems in this area? > > > > > What does it take to do a 64-bit port? The first problem I see is the > > boot loader -- do I have to be in 64-bit mode when the kernel starts, > > or can I start in 32-bit mode and then transfer to 64-bit mode? > > > > I looked in the arch/mips64/ directory, but I don't see much for > > specific boards there, but there are references to the Malta > > boards.... > > > > Matt > > > > -- > > Matthew D. Dharm Senior Software Designer > > Momentum Computer Inc. 1815 Aston Ave. Suite 107 > > (760) 431-8663 X-115 Carlsbad, CA 92008-7310 > > Momentum Works For You www.momenco.com > > > > > > -- > Daniel Jacobowitz Carnegie Mellon University > MontaVista Software Debian GNU/Linux Developer