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Re: MIPS 64?

To: "Matthew Dharm" <mdharm@momenco.com>
Subject: Re: MIPS 64?
From: "Kip Walker" <kwalker@broadcom.com>
Date: Wed, 15 May 2002 14:55:39 -0700
Cc: Linux-MIPS <linux-mips@oss.sgi.com>
Organization: Broadcom Corp. BPBU
References: <NEBBLJGMNKKEEMNLHGAIOEPPCGAA.mdharm@momenco.com> <20020515214818.GA1991@nevyn.them.org>
Sender: owner-linux-mips@oss.sgi.com
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


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