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Re: Question concerning memory configuration

To: Jeff Harrell <jharrell@ti.com>
Subject: Re: Question concerning memory configuration
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Sat, 29 Jan 2000 03:52:33 +0100
Cc: sgi-mips <linux@cthulhu.engr.sgi.com>
In-reply-to: <389218F6.7CAD27A5@ti.com>
References: <389218F6.7CAD27A5@ti.com>
Sender: owner-linuxmips@oss.sgi.com
On Fri, Jan 28, 2000 at 03:32:22PM -0700, Jeff Harrell wrote:

> I have question concerning the memory configuration variables in the
> MIPS/Linux codebase.  I am working on a board that has 64Mbytes
> (0x400 0000) of SDRAM.  We are using an R4000 core and have the memory
> map setup so that KSEG0 & KSEG1 both map to address 0x0 in physical
> memory.  On our embedded system we are going to hard code the variable
> mips_memory_upper (This eventually is stored in memory_end).  My
> question is what I should initialize the value to?  Do I treat the top
> of memory as KSEG1 + 64Mbytes? (i.e., 0xA400 0000) or do I initialize it
> realative to 0?  If anybody has any insights in this area, any
> information would be greatly appreciated.

I killed mips_memory_upper in 2.3.27.  Now the kernel uses the same
bootmem functions as the other machines to implement that functionality.
I suggest you take a look at arch/mips64/sgi-ip27/ip27-memory.c for
a simple example how to use this interface.

  Ralf

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