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Full Discussion: Installed memory ≠ usable size?
Special Forums Hardware Filesystems, Disks and Memory Installed memory ≠ usable size? Post 302334640 by otheus on Thursday 16th of July 2009 06:16:01 AM
Old 07-16-2009
BIOS and Video RAM allocation

The blog you linked to noted that PCI-Express controllers can allocate 512 MB of address space. This might be what's happening, and the controller is allocating the upper part of the 32-bit memory address on the bus. Take out your video controller, and put in a generic PCI one (or use the motherboard's generic one??) In fact, take out ALL PCI-E controllers. Maybe the allocated memory will change.

The second thing to try -- not at the same time as above, please -- is specifying mem=4096M on the kernel line in grub. Go to grub.conf and change this, or on boot, append that option to the kernel-load line. Maybe the OS will magically remap whatever is eating the address space and see 4GB. Then, make sure you try to ALLOCATE that memory, to make sure it's actually usable. A simple perl script will do the job.
 

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LEARN ABOUT REDHAT

pcitweak

PCITWEAK(1)						      General Commands Manual						       PCITWEAK(1)

NAME

       pcitweak - read/write PCI config space

SYNOPSIS

       pcitweak -l
       pcitweak -r PCI-ID [-b|-h] offset
       pcitweak -w PCI-ID [-b|-h] offset value

DESCRIPTION

       Pcitweak  is  a utility that can be used to examine or change registers in the PCI configuration space.	On most platfoms pcitweak can only
       be run by the root user.

OPTIONS

       -l      Probe the PCI buses and print a line for each detected device.  Each line contains the  bus  location  (bus:device:function),  chip
	       vendor/device, card (subsystem) vendor/card, revision, class and header type.  All values printed are in hexadecimal.

       -r PCI-ID
	       Read  the PCI configuration space register at offset for the PCI device at bus location PCI-ID.	PCI-ID should be given in the form
	       bus:device:function, with each value in hexadecimal.  By default, a 32-bit register is read.

       -w PCI-ID
	       Write value to the PCI configuration space register at offset for the PCI device at bus location PCI-ID.  PCI-ID should be given in
	       the form bus:device:function, with each value in hexadecimal.  By default, a 32-bit register is written.

       -b      Read or write an 8-bit value (byte).

       -h      Read or write a 16-bit value (halfword).

SEE ALSO

       scanpci(1)

AUTHORS

       David Dawes (dawes@xfree86.org).

XFree86 						       Version Version 4.3.0						       PCITWEAK(1)
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