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Linux Boot RAM Determination

To: linux-mips@linux-mips.org
Subject: Linux Boot RAM Determination
From: Sean Parker <supinlick@yahoo.com>
Date: Tue, 17 Jun 2008 10:45:01 -0700 (PDT)
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Hello -

  We're developing a PMC-Sierra RM9000 system, and when Linux boots it seems to 
only see 256M RAM (cat /proc/meminfo -> MemTotal=256M), despite a Crucial 1GB 
double-sided SODIMM card.

  The boot code is PMON, and it recognizes all 1GB (dimm0:2 Ranks each 512MB) 
and prints as much when it's done.

  Is there a setting in the Linux source (we're using a single elf image with 
ramfs integrated) that might be limiting the MemTotal/RAM size found by Linux? 
I couldn't find anywhere in the Linux code (patched by PMC) that mentions 
reading the DDR DCR's to inspect what the configured RAM sizes/offsets are. Any 
ideas?

  Thanks and God Bless,
    Sean Parker 




      

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