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Re: Using more than 256 MB of memory on SB1250 in 32-bit mode, revisited

To: Matthew Starzewski <mstarzewski@xes-inc.com>
Subject: Re: Using more than 256 MB of memory on SB1250 in 32-bit mode, revisited
From: Thomas Petazzoni <thomas.petazzoni@enix.org>
Date: Fri, 10 Dec 2004 09:46:57 +0100
Cc: linux-mips@linux-mips.org, Steve.Finney@SpirentCom.COM
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Hello,

Matthew Starzewski a écrit :
I've tried to enable HIGHMEM to access all 512MB of
SDRAM on a BCM1125 based board as per this previous
thread:
Using more than 256 MB of memory on SB1250 in 32-bit mode :
http://www.spinics.net/lists/mips/msg14396.html
BCM1125 Board: XPedite3000 PrPMC
http://www.xes-inc.com/Products/XPedite/XPedite3000/XPedite3000.html

I'm really unsure of what I'll say, but I've seen people on this list talking about CONFIG_DISCONTIGMEM, an option for the kernel, which is :

"Say Y to upport efficient handling of discontiguous physical memory,
 for architectures which are either NUMA (Non-Uniform Memory Access)
 or have huge holes in the physical address space for other reasons.
 See <file:Documentation/vm/numa> for more."

Maybe it's what you're looking for, maybe not.

I'm still very surprised that Linux cannot handle strange physical memory configuration simply (holes in physical memory, DMA memory at higher addresses than normal memory).

Thomas
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PETAZZONI Thomas - thomas.petazzoni@enix.org
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