From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (from majordomo@localhost) by oss.sgi.com (8.11.2/8.11.3) id g162Zbe05324 for linux-mips-outgoing; Tue, 5 Feb 2002 18:35:37 -0800 Received: from dea.linux-mips.net (a1as11-p112.stg.tli.de [195.252.190.112]) by oss.sgi.com (8.11.2/8.11.3) with SMTP id g162ZXA05321 for ; Tue, 5 Feb 2002 18:35:33 -0800 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.1) id g162Xkf11663; Wed, 6 Feb 2002 03:33:46 +0100 Date: Wed, 6 Feb 2002 03:33:46 +0100 From: Ralf Baechle To: "Steven J. Hill" Cc: linux-mips@oss.sgi.com Subject: Re: What is the maximum physical RAM for a 32bit MIPS core? Message-ID: <20020206033346.A7298@dea.linux-mips.net> References: <3C600D4C.43CBA784@cotw.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3C600D4C.43CBA784@cotw.com>; from sjhill@cotw.com on Tue, Feb 05, 2002 at 10:50:20AM -0600 X-Accept-Language: de,en,fr Sender: owner-linux-mips@oss.sgi.com Precedence: bulk On Tue, Feb 05, 2002 at 10:50:20AM -0600, Steven J. Hill wrote: > I am just trying to fill in some more MIPS knowledge here. With a 32-bit > MIPS processor, we are forever limited to a userspace of 2GB in size thanks > to the kuser region. kseg0/1 map the same 512MB of physical memory. kseg2 > is 1GB in size and hence it could address another 1GB of RAM. So, is the 2gb virtual memory per process. In theory physical memory is limited by the size of the address bus with highmem; the practical limit for highmem should be in the range of 16-32gb RAM. Ralf