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My machine has 128 MB of RAM, however Linux only sees 64 MB of it.

2005-02-03 Application Document No.1-0002931

Related Product:

PCA-6751/ PCA-6752/ PCA-6753/ PCA-6770/ PCI-6771/ PCM-4823/ PCM-4825/ PCM-5820/ PCM-5862E/ PCM-9570/ POS-560/ POS-562

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Solution:

  • My machine has 128 MB of RAM, however Linux only sees 64 MB of it.

    On most systems, the reason is that the BIOS has a limit of how much memory it
    will tell the OS is present in the machine, even
    though the board can have more. Common limits seen with this problem are 16M,
    32M, 64M, and 128M. To get around this, we
    need to explicitly specify the amount of memory to the kernel at boot time via
    the mem=< actual memory goes here > flag.

    In the following example, we have a 128M machine but only 64M are being seen by
    Linux. At the LILO prompt, we type

    LILO: linux mem=128M

    After the machine boots, we use the free command to see if the larger amount of
    memory was recognized by the kernel. If so,
    we can add an append line to the /etc/lilo.conf file and rerun LILO to make it
    happen permanently. The example from above could
    look like the following:

    boot=/dev/sda
    map=/boot/map
    install=/boot/boot.b
    prompt
    timeout=50
    image=/boot/vmlinuz-2.2.12-20
    label=linux
    root=/dev/sda1
    initrd=/boot/initrd-2.2.12-20.img
    read-only
    append="mem=128M"

    Do not forget to run /sbin/lilo -v after editing the file.

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