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Re: What is the maximum physical RAM for a 32bit MIPS core?

To: Ralf Baechle <>
Subject: Re: What is the maximum physical RAM for a 32bit MIPS core?
From: William Lee Irwin III <>
Date: Wed, 6 Feb 2002 05:17:33 -0800
Cc: "Steven J. Hill" <>,
In-reply-to: <>
Organization: The Domain of Holomorphy
References: <> <>
User-agent: Mutt/1.3.25i
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

On Wed, Feb 06, 2002 at 03:33:46AM +0100, Ralf Baechle wrote:
> 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.

I'm aware that some of those issues have to do with boot-time allocations
proportional to memory size filling the direct-mapped portion of the kernel
virtual address space. Do you have in mind others? I'm just generally


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