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non-contiguous physical memory

Subject: non-contiguous physical memory
From: (Yaron Presente)
Date: Thu, 24 Jun 2004 15:46:43 +0300
Organization: MRV International
Original-recipient: rfc822;
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Hi all,
I'm running montavista linux (2.4.18_mvl30-malta-mips_fp_le) on a board that has 2 memory banks of physical memory.
1. 32MB from physical address 0x00000000
2. 16MB from physical address 0x20000000

Currently I can only access the first bank (by add_memory_region(0, 32 << 20, BOOT_MEM_RAM) in prom_init() ). I tried the obvious solution of adding another region at 0x20000000 (add_memory_region(0x20000000, 16 << 20, BOOT_MEM_RAM)) but that didn't seem to work. I've also tried to add a BOOT_MEM_RESERVED region in between the regions in order to create a seemingly contiguous memory, with no success.
My questions are:
Is it possible to access the second bank as well under MIPS ?
Is there a way to define a "hole" in the physical memory?
Do I have to use CONFIG_DISCONTIGMEM ? is it fully supported ?
Thanks for your help,

Yaron Presente
MRV International
Direct   : 972-4-9936237
Fax      : 972-4-9890564
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