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Re: How to add more memory?

To: Nils Larson <>
Subject: Re: How to add more memory?
From: Ralf Baechle <>
Date: Thu, 22 Jan 2004 01:28:27 +0100
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Original-recipient: rfc822;
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Resent-date: Thu, 22 Jan 2004 01:32:59 +0100
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On Wed, Jan 21, 2004 at 03:58:24PM -0600, Nils Larson wrote:

> We currently have a mips platform running Linux with 256MB of
> RAM starting at 0x8000_0000. We would like to add an additional
> 1GB of RAM, maybe starting at 0x4000_0000, that would be used
> for user apps (user virtual memory). The memory map is:
> 0x8000_0000 - 256MB RAM
> 0xA000_0000 - uncached version of the same 256MB
> 0xB000_0000 - PCI memory windows.
> This is a diskless setup booting from a ramdisk.
> So, the (sort of newbie) questions are:
> 1. How do we tell Linux to use the new memory?
> 2. Is this feasible?
> 3. Is there a better way to add more memory?
> We need more space for user data.

I wrote the highmem code for Linux/MIPS.  It's currently limited
to processor configurations that don't suffer from virtual aliases but
that limitation can be removed; depending of your application and hardware
that may be anywhere from trivial to hard.   What is your processor?


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