[Top] [All Lists]

Linux Boot RAM Determination

Subject: Linux Boot RAM Determination
From: Sean Parker <>
Date: Tue, 17 Jun 2008 10:45:01 -0700 (PDT)
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024;; h=Received:X-Mailer:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=vLRVdOyXCJkSNt8PKLQWzw07+4958MuiI+/2Q4eoolarFUCyTjQRwk29jlj0G3nQcYySuDn6TYaSL8ga4nlozXkdd+Bis/Sr6uGKYbqNfNRjedhY7Pn+WJY6i7tazrwBqClEh9lwiQ1rsY1tH4634MSQsE66Zc9KRru8CXx+hDc=;
Original-recipient: rfc822;
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 

  Thanks and God Bless,
    Sean Parker 


<Prev in Thread] Current Thread [Next in Thread>